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HTTP Status Code Lookup

Searchable reference of 47 HTTP status codes (1xx-5xx). Search by code (404), name (Not Found), or keyword (rate limit, redirect). Color-coded by category. Concise developer-friendly descriptions.

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48 of 48 status codes

100

Continue

1xx Informational

Initial part of request received; client should continue with the rest.

101

Switching Protocols

1xx Informational

Server agreeing to switch protocols (e.g. HTTP/1.1 → WebSocket).

102

Processing

1xx Informational

Server received and is processing the request (WebDAV).

103

Early Hints

1xx Informational

Sent before final response with preloads. Used for performance.

200

2xx Success

Standard successful response.

201

Created

2xx Success

Request succeeded and a new resource was created.

202

Accepted

2xx Success

Request accepted for processing but not completed.

203

Non-Authoritative Information

2xx Success

Returned meta-info from a different source.

204

No Content

2xx Success

Success with no response body. Common after DELETE.

205

Reset Content

2xx Success

Success; client should reset its view (clear the form).

206

Partial Content

2xx Success

Partial response for Range requests (video streaming, resumed downloads).

300

Multiple Choices

3xx Redirect

Multiple options for the resource; client must pick.

301

Moved Permanently

3xx Redirect

Resource permanently moved. Transfers SEO authority.

302

Found

3xx Redirect

Temporary redirect. Original URL still canonical.

303

See Other

3xx Redirect

Redirect to GET the response from another URL (POST-Redirect-GET pattern).

304

Not Modified

3xx Redirect

Cached version is still valid (conditional GET).

307

Temporary Redirect

3xx Redirect

Like 302 but preserves HTTP method (POST stays POST).

308

Permanent Redirect

3xx Redirect

Like 301 but preserves HTTP method.

400

Bad Request

4xx Client Error

Malformed request. Common for invalid JSON / parameters.

401

Unauthorized

4xx Client Error

Authentication required or failed.

402

Payment Required

4xx Client Error

Reserved for future use. Stripe and some APIs use it for failed payments.

403

Forbidden

4xx Client Error

Authenticated but not authorized for this resource.

404

Not Found

4xx Client Error

Resource does not exist at this URL.

405

Method Not Allowed

4xx Client Error

HTTP method not supported for this resource.

406

Not Acceptable

4xx Client Error

Server cannot produce a response matching Accept headers.

408

Request Timeout

4xx Client Error

Client took too long to send the request.

409

Conflict

4xx Client Error

Request conflicts with current state (e.g. version mismatch).

410

Gone

4xx Client Error

Resource permanently removed. Faster deindex than 404.

411

Length Required

4xx Client Error

Content-Length header is required.

413

Payload Too Large

4xx Client Error

Request body exceeds server limit.

414

URI Too Long

4xx Client Error

URL is too long.

415

Unsupported Media Type

4xx Client Error

Content-Type not supported.

416

Range Not Satisfiable

4xx Client Error

Requested Range is out of bounds.

418

I'm a Teapot

4xx Client Error

April Fools 1998 joke (RFC 2324). Some sites use it for "blocked".

422

Unprocessable Entity

4xx Client Error

Syntactically valid but semantically wrong (validation errors).

425

Too Early

4xx Client Error

Server unwilling to process replay-risk request.

426

Upgrade Required

4xx Client Error

Client must switch to a different protocol.

429

Too Many Requests

4xx Client Error

Rate limit exceeded. Check Retry-After header.

451

Unavailable For Legal Reasons

4xx Client Error

Resource blocked by legal demand (DMCA, GDPR, court order).

500

Internal Server Error

5xx Server Error

Generic server error. Check server logs.

501

Not Implemented

5xx Server Error

Server does not support the request method.

502

Bad Gateway

5xx Server Error

Server acting as proxy got invalid response from upstream.

503

Service Unavailable

5xx Server Error

Server temporarily down or overloaded.

504

Gateway Timeout

5xx Server Error

Proxy timed out waiting for upstream response.

505

HTTP Version Not Supported

5xx Server Error

Server does not support the HTTP version used.

507

Insufficient Storage

5xx Server Error

Server has no storage for this operation (WebDAV).

508

Loop Detected

5xx Server Error

Server detected an infinite loop while processing.

511

Network Authentication Required

5xx Server Error

Client must authenticate to network (captive portal).

48 HTTP status codes from the IANA registry. Most common in practice: 200, 301, 302, 304, 400, 401, 403, 404, 429, 500, 502, 503, 504.

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Inside the tool

What powers the HTTP Status Code Lookup

47 HTTP status codes from IANA registry

Search by number, name, or description keyword

Filter by category (1xx Info, 2xx Success, 3xx Redirect, 4xx Client, 5xx Server)

Concise dev-focused descriptions

Instant

Built differently

Why the HTTP Status Code Lookup is different

Browser-native

The HTTP Status Code Lookup runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.

No artificial limits

No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.

Production-grade quality

Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.

Use Contexts

Common use contexts

Debugging API responses
Choosing the right status code for a new endpoint
Quick reference for "what does 422 mean again"
Learning HTTP semantics

Privacy by design

Private and secure

Zero upload

All processing happens in your browser. Input is never transmitted, logged or cached.

Works offline

Once the page loads, the tool runs without an internet connection. No network calls happen during use.

No tracking

No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.

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FAQ