Access DeepSeek With Clash in 2026: Split Rules for Web and API Domains

Why “route everything” is a weak default for DeepSeek

A single catch-all outbound is seductive: one toggle, fewer questions. In practice, generative products mix short REST calls, long-lived TLS sessions, occasional server-sent streaming, and cross-domain assets that do not all benefit from the same exit geography or congestion profile. If your default node peers poorly with the CDN fronting static files, you may blame “AI latency” when the model never saw your prompt. If your DNS answers are inconsistent between the browser’s encrypted resolver and Clash’s internal resolver, you can spend hours swapping nodes that were never the root cause.

Clash is built for policy routing: you define proxy-groups, then write rules that send each connection to a group, to DIRECT, or elsewhere. The goal here is not to paste a fifty-line domain dump from a forum screenshot; it is to pair a compact, verifiable rule block for DeepSeek-related traffic with DNS behavior that makes DOMAIN and DOMAIN-SUFFIX matchers actually fire during real sessions. If you are new to that model, start with the site’s Clash tutorial, then return here for a DeepSeek-shaped overlay on the same YAML ideas.

How this guide differs from our Google Gemini walkthrough

We already published a browser-centric guide for Google Gemini that focuses on Google account choreography, wide googleapis.com families, and Chromium-specific quirks. That article is the right reference when your hostnames live under Google’s shared infrastructure and your pain is sign-in loops or Gemini UI assets. This page targets DeepSeek’s own hostname family instead: marketing pages, chat, developer console, documentation, status, and the API origin your SDK points at—without recycling Gemini’s domain list or keyword focus.

If you run both products, keep separate outbound groups or clearly named child selectors so logs remain readable. Merging unrelated AI vendors into one bucket named AI is convenient for a day and confusing for a month. For API-heavy editor workflows that are not vendor-specific, our Cursor and GitHub split-routing guide complements this article: it emphasizes process-aware routing and repository traffic, while here we emphasize hostname clarity for a single provider’s web and API surfaces.

What you are really routing: web, console, docs, status, and the API origin

DeepSeek sessions typically touch more than one name, but the set is smaller and more brand-local than a hyperscaler’s shared edge. Treat the following as a baseline to confirm in your own logs—official infrastructure can add hosts after updates, and regional deployments may introduce new subdomains.

• Public web and chat: deepseek.com, www.deepseek.com, and the chat application host chat.deepseek.com (paths may change; the hostname is what Clash matches).
• OpenAI-compatible API: api.deepseek.com for REST calls such as chat completions; many clients also accept a /v1 prefix for SDK compatibility. Always verify the exact base URL in the current official API documentation.
• Developer platform and keys: traffic to platform.deepseek.com when you manage API keys, quotas, or billing in the browser.
• Documentation and learning: api-docs.deepseek.com and related doc hosts when you read guides in a browser tab alongside your terminal.
• Operational visibility: status.deepseek.com (or similarly named status pages) when you sanity-check outages versus local misconfiguration.

Static assets may be served from additional CDNs or third-party analytics domains. Do not guess: reproduce the failure with logging enabled, read the Server Name Indication or destination names your machine actually uses, then extend the list surgically. If you maintain rules through remote providers, see our custom rules tutorial for merge order and how subscription refreshes can erase personal tweaks.

Web streaming, HTTP/2, and why “API works but chat stutters”

Browser chat often keeps a connection open while tokens arrive. Command-line API calls may complete in one request-response cycle. That difference matters when your exit node shapes traffic aggressively, when UDP or QUIC paths diverge from TCP, or when a middlebox resets idle streams. When symptoms split along browser versus CLI, compare capture mode first: system proxy settings do not always intercept every helper process, while TUN mode can surface more flows at the cost of complexity. For transparent capture background, read our TUN mode deep dive.

IPv6 and dual-stack gotchas

On networks that advertise IPv6, your OS may prefer AAAA records. If your proxy path handles IPv4 and IPv6 asymmetrically, you can see intermittent failures that correlate with switching between Wi-Fi and tethering rather than with DeepSeek itself. When debugging, note whether log lines show v4 or v6 destinations and whether you need explicit IP-CIDR6 DIRECT lines for local ranges, mirroring what you already do for RFC1918 IPv4 space.

Design outbound groups: one bucket or two?

Before editing rules, define proxy-groups entries you can aim at. A single group named DeepSeek is enough when the same exit satisfies both web and API. Two groups—DeepSeek-Web and DeepSeek-API—help when you want different regions, different failover policies, or stricter latency targets for programmatic calls while keeping the browser on a more stable residential-friendly path.

Prefer select when you want manual control, url-test or fallback when you want automatic rotation. The nodes must actually complete TLS to DeepSeek endpoints without broken certificate inspection or half-configured IPv6. For scheduling mechanics inside YAML, our proxy groups guide explains selectors, health checks, and nesting without tying the story to a single vendor.

Keep these groups separate from a generic Proxy catch-all so your logs answer a simple question: when chat failed, did DeepSeek traffic hit the intended policy name? If the answer is no, fix capture or rule order before you chase the fifth node in a list.

Domain rules: conservative matchers and precedence

Clash evaluates rules top to bottom; first match wins. Place LAN exclusions, private ranges, and other high-confidence DIRECT lines before vendor-specific matchers. Then add DeepSeek names with DOMAIN for exact hosts and DOMAIN-SUFFIX only when you understand the blast radius—DOMAIN-SUFFIX,deepseek.com,DeepSeek is simple and broad; it may also route subdomains you did not intend if DeepSeek later introduces edge services you wanted on DIRECT.

Developers who run scripts on servers without a browser still benefit from the same idea: your HTTP client resolves api.deepseek.com; if resolution is poisoned or split-horizon, the TLS handshake never reaches the policy you wrote. That is DNS-first debugging, not “try another Singapore node.”

YAML skeleton: LAN first, then web and API hosts

Assume your profile already defines proxies and a group named DeepSeek. The fragment below is illustrative: adapt names, merge with your provider template, and verify hostnames against your own capture.

# Local and loopback first (adjust to your network)
IP-CIDR,192.168.0.0/16,DIRECT
IP-CIDR,10.0.0.0/8,DIRECT
IP-CIDR,172.16.0.0/12,DIRECT
IP-CIDR,127.0.0.0/8,DIRECT

# DeepSeek — verify in YOUR logs after vendor updates
DOMAIN,api.deepseek.com,DeepSeek
DOMAIN,chat.deepseek.com,DeepSeek
DOMAIN,platform.deepseek.com,DeepSeek
DOMAIN,api-docs.deepseek.com,DeepSeek
DOMAIN,status.deepseek.com,DeepSeek
DOMAIN-SUFFIX,deepseek.com,DeepSeek

# Remaining traffic follows your profile (GEOIP, MATCH, etc.)
# MATCH,Auto

If you split web and API across two groups, duplicate the DOMAIN lines with different targets—DeepSeek-Web for chat and marketing hosts, DeepSeek-API for api.deepseek.com—and keep the order consistent with your operational intent. The YAML is not magic; it is a deterministic decision list applied to each connection Clash sees.

RULE-SET workflows for teams

Individuals can maintain a short inline block. Teams often prefer a RULE-SET remote file or internal Git snippet so reviewers can diff changes. Meta-class cores support rule providers; the maintenance challenge is the same as inline YAML—document ownership, pin update intervals thoughtfully, and ensure your personal overrides survive subscription merges. When a Friday evening provider refresh reorders rules, rerun your one-minute log check instead of assuming “DeepSeek broke.”

Keep machine-readable comments in a separate changelog if your provider strips comments. Humans forget why platform.deepseek.com was added; future you will not remember unless you wrote it down outside the auto-generated blob.

When you publish a shared ruleset internally, version it like any other config artifact: semantic tags, a short README that states assumptions (“desktop browsers only,” “includes API for CI runners behind corporate proxy”), and a rollback path. Nothing undermines trust faster than a silent rule update that sends payroll spreadsheets through a research exit because someone broadened DOMAIN-SUFFIX without reading the diff. Code review for YAML is boring until the day it prevents an incident; treat AI vendor rules with the same seriousness as firewall ACLs that touch production egress.

Where hand-written rules beat giant community lists

Community-maintained “AI rulesets” can save time, but they also age unevenly: one contributor’s REJECT line for analytics might block a telemetry hostname your client now requires, or a stale IP-CIDR entry might send traffic to the wrong continent after the vendor renumbers. For DeepSeek, the hostname surface is still compact enough that logging first, then adding lines often beats importing ten thousand lines you cannot explain. If you do import a remote set, fork it, pin the URL, and schedule periodic reviews—automatic updates without human attention are how surprises compound.

DNS: the hidden half of correct domain rules

Misconfigured DNS makes split routing look “random.” In fake-ip modes, Clash maps domain queries to synthetic addresses internally; that is elegant until a browser uses a different encrypted resolver and caches divergent answers. Symptoms include intermittent TLS failures, endless loading spinners, and “worked until reboot” behavior.

Align deliberately. If applications use DNS over HTTPS directly, those queries may bypass assumptions your DOMAIN rules rely on, because the core observes an IP connection without the domain context you expected. Mitigations are practical, not ideological: route known DoH provider hostnames through the same policy as the app, steer DoH to a resolver you control, or accept IP-based classification and document the trade-off. The objective is consistent name-to-policy mapping across the processes you care about.

When the web UI loads but API calls from a terminal fail (or the reverse), compare which resolver each tool uses. IDEs and language runtimes frequently ignore OS proxy settings unless configured; they may still honor HTTP proxies when set, but DNS might be OS-level or library-level. Uniform debugging beats swapping exits blindly.

Poisoned answers, captive portals, and “not malware” anomalies

Not every strange DNS response is an attack. Hotels and coffee shops return synthetic answers until you authenticate. Some enterprise filters categorize AI domains inconsistently. If DeepSeek fails only on one physical network, test a phone hotspot before you rewrite YAML. Correlation saves time.

Split DNS versus “one resolver to rule them all”

Power users sometimes configure different upstreams for domestic versus foreign names. That can work well when documented, but it increases cognitive load for family machines. Pick a strategy that matches who operates the computer: a disciplined single-path resolver behind Clash is often easier to support than three parallel experiments fighting each other.

Another subtle failure mode is negative caching: a transient NXDOMAIN or SERVFAIL during a flaky network moment gets cached by an intermediate layer, and every subsequent attempt “proves” the hostname does not exist until a TTL expires. When DeepSeek intermittently fails with name-resolution errors in one application but not another, flush caches methodically—browser, OS stub resolver, and any security product that implements its own mini-DNS—and retest on a clean network before editing Clash. Otherwise you chase proxy nodes while the real bug is a thirty-second mistake from Tuesday afternoon still sitting in a cache.

TLS SNI, ESNI/ECH, and “why my DOMAIN rule did not match”

Most user guides implicitly assume visible SNI hostnames. Encrypted Client Hello and related privacy features change how much a middle observer—or a local proxy core—can infer without additional configuration. If your client stack enables aggressive privacy modes, you may see more IP-only flows hitting GEOIP or final MATCH lines than you expect. When that happens, either accept broader IP-based policies with documented risk, adjust client settings for controlled debugging, or route known CDN IP ranges with explicit caution. The lesson generalizes: domain rules express intent about names; if names disappear from the wire, policy must adapt.

System proxy versus TUN for browsers, terminals, and containers

System proxy mode is usually the gentlest first step on desktops: browsers pick it up, and many GUI clients integrate cleanly. Yet terminals, language package managers, and Docker workloads may not use the same environment variables. TUN mode raises capture rates at the cost of occasional conflicts with other VPN products or corporate agents.

A practical sequence is: confirm Clash loads the profile you think it does; reproduce a minimal DeepSeek action with logs open; if connections never hit the core, escalate capture rather than adding more domain lines. Disable competing full-tunnel VPNs during tests—two layers arguing over routes produces “half the internet works” reports that waste weekends.

CI runners, cloud shells, and headless API clients

Continuous integration environments often lack a Clash sidecar entirely. The split-routing lessons still apply conceptually—predictable DNS and egress—even when implementation shifts to corporate HTTP proxies or allow-listed NAT gateways. If you develop locally with Clash but deploy to a locked-down server, document the difference so 401/403 errors are not misread as routing bugs.

Local scripts that read HTTPS_PROXY may still perform DNS resolution through libc before the CONNECT tunnel forms; if resolution fails, no proxy rule ever runs. Exporting ALL_PROXY or teaching libraries to use a SOCKS5 front-end can change that story, but the fix is library-specific. When helping teammates, share a minimal reproduction—ten lines of Python or curl with verbose flags—rather than a screenshot of a GUI. The verbose trace shows whether failure happens at DNS, TCP connect, TLS handshake, or HTTP status, which maps cleanly onto Clash log lines once traffic actually reaches the core.

API keys, logs, and operational hygiene

Developer guides rightly stress never committing API keys. Operational reality also means not pasting keys into random “test” chat windows and not leaving debug logging enabled in shared machines where logs aggregate to a vendor SIEM. Clash logs can include destination hostnames and timing metadata; depending on verbosity, they may surface enough context to reconstruct usage patterns. Treat log retention like any other sensitive artifact: rotate, redact, and scope access.

When rate limits or quota errors appear, exponential backoff is table stakes. Split routing does not exempt you from polite client behavior—if anything, stable proxy paths make it easier to accidentally hammer endpoints from a long-running loop. Instrument your jobs with request IDs and clear error classification so you know whether a 429 is a quota story, a regional capacity story, or your own bug in retry logic.

Mobile browsers and companion apps

Phones switch radios aggressively; DNS caches and “Wi-Fi assist” style features can route subflows in ways desktop users rarely see. If you run Clash-class clients on mobile, verify hostnames on the device itself. Do not assume a working laptop profile transfers one-to-one when the mobile client uses per-app VPN semantics or split tunnel lists managed by the OS vendor.

Background refresh may delay when a chat UI reconnects after sleep; that can look like “DeepSeek is down” when the actual issue is power management starving network tasks. Before rewriting rules on mobile, compare behavior on a stable charger-connected session with background restrictions lifted—then decide whether policy or hardware policy is the culprit.

Verification workflow you can repeat in sixty seconds

First, confirm the active profile and that local overrides survived any subscription refresh. Second, open logs and run a minimal web test: load chat, send a short prompt, wait for completion or failure. Third, run a minimal API test from the same machine—curl or a tiny script—to api.deepseek.com using your real key in a safe environment. Fourth, note which rule matched and which outbound group handled each flow. Fifth, only then rotate nodes inside DeepSeek if throughput or loss remains suspect.

When authentication misbehaves, widen the window: account-related hosts might still hit DIRECT because an earlier MATCH swallowed traffic. When streaming stalls, check UDP/QUIC paths and MTU before you assume model saturation. Good engineers tie symptoms to connection classes; Clash rewards that habit.

What to record when something regresses

Capture the profile version, core flavor, capture mode, three example destination hostnames from the failure window, and the network type (Ethernet, Wi-Fi band, or cellular). Browser updates and OS “secure DNS” toggles are frequent silent variables. A short, structured note turns “it broke again” into a solvable diff.

Symptom cookbook: likely causes before you blame the model

• 401/403 on API calls while the web app works: keys, billing, or model name issues are primary suspects—verify credentials independent of Clash. If only CLI fails, check whether the terminal uses a different proxy or DNS path than the browser.
• Chat loads but responses never start: inspect whether streaming endpoints are blocked by a premature REJECT or an upstream that strips long-lived connections; compare with a short non-streaming request.
• Timeouts only on one network: correlate with captive portals, IPv6 preference, or carrier-grade NAT; compare hotspot versus office Ethernet.
• Everything fails after a subscription update: diff merge order—provider templates sometimes insert broad GEOIP or early MATCH lines that bypass your DeepSeek block.
• “Works in incognito, fails in normal profile”: suspect extensions that rewrite headers, force alternate resolvers, or inject corporate inspection certificates differently per profile.
• Intermittent TLS handshake errors: check system clock skew, custom root stores on security appliances, and whether a different exit presents a captive portal HTML page instead of a certificate chain.

Use the list as orientation, not scripture. Logs remain authoritative; cookbooks reduce the search space so you do not spiral through twelve unrelated forum threads at two in the morning.

Making overrides survive subscription churn

Most people import remote profiles. Auto-updates can replace rules wholesale. Prefer client features that prepend or append user snippets, or maintain a local merge file you control. After every refresh, rerun the short verification sequence. Treat it like a smoke test for infrastructure you rely on daily.

Performance tuning without fooling yourself

Latency to inference endpoints is only one variable. Thermal throttling, background sync, and aggressive browser extensions can mimic network stalls. Before you add a sixth domain guess, close heavy tabs, disable a suspect extension briefly, and retest. Separate application slowness from path slowness; Clash only addresses the latter directly.

Privacy, terms, and realistic expectations

Routing changes path selection; it does not replace compliance with service terms, workplace policies, or regional regulations. Corporate devices may forbid split tunneling. This article assumes you configure a machine you own or legitimately administer.

Prefer the site’s download page for maintained clients; treat upstream GitHub repositories as transparency and issue tracking, not necessarily as the first click for every installer decision.

Putting it together

Stable DeepSeek access with Clash in 2026 is less about secret host lists and more about a tight loop: observe names in logs, encode them into focused domain rules aimed at dedicated groups, align DNS with capture mode, and prove matches before swapping nodes. Compared with global proxy toggles, that approach keeps unrelated traffic on sensible paths, makes web and API failures easier to separate, and survives vendor infrastructure churn if you treat lists as living documents.

For a parallel example aimed at another AI vendor’s browser ecosystem, see our Google Gemini rules and DNS guide. When you are ready to install or standardize a maintained Clash Meta-class client, walk through our Clash tutorial and use our download page as the primary path—Download Clash for free and experience the difference.