HTTP API IPKit

GET, HEAD /

Current public IP of the connecting client. Browsers (Accept: text/html) get the homepage HTML; curl and most scripts get JSON. Force JSON with ?format=json or use /api/my-ip.

GET, HEAD /{ip}

Look up a specific public IPv4 or IPv6 address. Always JSON, even in a browser. Example: /8.8.8.8. Invalid syntax returns 400 INVALID_IP. Private and reserved ranges return 400 RESERVED_IP. Requires the Worker secret IPREGISTRY_API_KEY; otherwise 503 LOOKUP_UNAVAILABLE.

GET, HEAD /api/my-ip

Current public IP, always JSON. This is the URL the website itself fetches.

GET, HEAD /api/ip/{ip}

Look up a specific public address, always JSON. Same validation and provider requirement as /{ip}. Encode the address (especially IPv6) when building the path, for example /api/ip/8.8.8.8.

OPTIONS /, /{ip}, /api/my-ip, /api/ip/{ip}

CORS preflight on every public JSON lookup URL. Returns 204 with Access-Control-Allow-Origin: *, Allow-Methods GET, HEAD, OPTIONS, and Access-Control-Max-Age 86400.

Lookup routes accept GET, HEAD, and OPTIONS. HEAD returns the same status and headers with an empty body. POST and other methods are not part of the lookup API. Clients do not send an API key; arbitrary lookups still need the operator-configured IPREGISTRY_API_KEY Worker secret.

There is no plaintext-only route and no endpoint that returns a single field. Read ip from the ipkit.v1 object (for example jq -r .ip). Lookups of private, loopback, link-local, CGNAT, multicast, unspecified, documentation, and other reserved IPv4/IPv6 ranges (including IPv4-mapped IPv6 such as ::ffff:10.0.0.1) return 400 RESERVED_IP. Current-IP detection of this connection is not subject to that check.

?format=json

JSON ipkit.v1, even when Accept includes text/html.

?format=html

HTML homepage, even when the client would otherwise get JSON (for example curl).

Accept includes text/html

HTML homepage. Typical browsers send this.

HTML crawler User-Agent

Googlebot, Bingbot, Baidu, Sogou, and 360Spider receive HTML on / so they index the page instead of JSON.

Otherwise

JSON. curl’s default Accept is */*, and fetch() defaults to */*, so both receive JSON from / without extra headers.

source is "ipregistry" when the configured intelligence provider succeeded. It is "cloudflare" when the record is built from Cloudflare request metadata (used for the current IP if the provider is missing or fails). Cloudflare metadata describes the connecting client only; it is never used as geolocation for a different target IP. Cloudflare-sourced records fill location.countryCode from request.cf.country or CF-IPCountry and location.country from that code when a name is known. Several network fields stay null, security flags are null, and security.risk is "unknown". If IPREGISTRY_API_KEY is unset, arbitrary lookups return 503 instead of guessing the caller’s country.

schema

Always "ipkit.v1" so clients can detect breaking changes.

ip

The public address that was detected (current connection) or requested (lookup).

type

"IPv4" or "IPv6".

source

"ipregistry" when the configured intelligence provider succeeded; "cloudflare" when the record is built from Cloudflare edge metadata only.

location.continent

Continent name when the provider supplies one; otherwise null.

location.country

Country name. For source=ipregistry, the provider’s name. For source=cloudflare, the English name derived from Cloudflare’s ISO country code (request.cf.country or CF-IPCountry). Null when the code is missing, XX (unknown), T1 (Tor), or otherwise unnamed.

location.countryCode

ISO 3166-1 alpha-2 code when known. Cloudflare supplies this for the connecting client. XX is stored as null. T1 (Tor) is kept as T1.

location.region

Region or state name at network granularity, or null.

location.regionCode

Region code when available, or null.

location.city

City at network granularity when the provider has one, or null.

location.postalCode

Postal code when the provider has one, or null. Not a street address.

location.latitude

Estimated latitude as a number, or null.

location.longitude

Estimated longitude as a number, or null.

location.timezone

IANA timezone id tied to the geolocation guess, or null.

network.asn

Autonomous system as "ASnnnn", or null.

network.organization

ISP or organization name for that ASN, or null.

network.domain

Network or company domain when the provider has one, or null.

network.route

Announced prefix/route when available, or null.

network.usage

Connection or company usage type from the provider (for example hosting), or null.

network.carrier

Mobile carrier name when the provider has one, or null.

security.proxy

Whether the provider flags a proxy; null when unknown (typical for source=cloudflare).

security.vpn

Whether the provider flags a VPN, or null.

security.tor

Whether the provider flags a Tor exit, or null.

security.relay

Whether the provider flags a privacy relay, or null.

security.cloud

Whether the provider flags a cloud provider, or null.

security.threat

Whether the provider flags a threat, or null. A signal, not proof.

security.risk

"low", "medium", "high", or "unknown". Derived from provider flags when present; "unknown" for cloudflare-sourced records. Not a fraud score and not sole proof for blocking.

{
  "schema": "ipkit.v1",
  "ip": "8.8.8.8",
  "type": "IPv4",
  "source": "ipregistry",
  "location": {
    "continent": "North America",
    "country": "United States",
    "countryCode": "US",
    "region": "California",
    "regionCode": "CA",
    "city": "Mountain View",
    "postalCode": null,
    "latitude": 37.386,
    "longitude": -122.0838,
    "timezone": "America/Los_Angeles"
  },
  "network": {
    "asn": "AS15169",
    "organization": "Google LLC",
    "domain": "google.com",
    "route": "8.8.8.0/24",
    "usage": "hosting",
    "carrier": null
  },
  "security": {
    "proxy": false,
    "vpn": false,
    "tor": false,
    "relay": false,
    "cloud": true,
    "threat": false,
    "risk": "medium"
  }
}

400 INVALID_IP

The path is not a syntactically valid IPv4 or IPv6 address. error is "Invalid IP address."

400 RESERVED_IP

The target on /{ip} or /api/ip/{ip} is a private, loopback, link-local, CGNAT, multicast, unspecified, documentation, or other reserved IPv4/IPv6 address, including IPv4-mapped IPv6 (for example ::ffff:10.0.0.1). error is "Private or reserved IP address." Current-IP GET / and /api/my-ip are not rejected this way.

429 RATE_LIMITED

The connecting client IP exceeded the lookup limit. error is "Too many lookups. Please retry in one minute." Retry-After is 60.

502 LOOKUP_UNAVAILABLE

The intelligence provider failed or timed out (about 6 seconds). error is "The IP data provider is temporarily unavailable."

503 LOOKUP_UNAVAILABLE

For /{ip} and /api/ip/{ip} this usually means the Worker secret IPREGISTRY_API_KEY is missing or empty on the Cloudflare account that serves ipkit.dev. error is then "IP intelligence is not configured for arbitrary lookups." That is operator configuration, not a client error. Set the secret in the dashboard (Workers & Pages → ipkit → Settings → Variables and Secrets) or with wrangler secret put IPREGISTRY_API_KEY. Current-IP GET / and /api/my-ip still succeed from Cloudflare metadata. The same status and code are also used when Ipregistry rate-limits IPKit; then error is "The IP data provider is temporarily unavailable."

500 LOOKUP_UNAVAILABLE

Unexpected lookup failure. error is "Unexpected lookup failure."

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