ASN API

API reference

ASN HTTP endpoints on api.syndaq.com.

All ASN endpoints are served from https://api.syndaq.com/v1/asn/.

Authenticated requests require a valid ASN key. Lookup routes require your as_sec_ secret key.

Endpoints overview

Method	Path	Auth	Purpose
GET	`/v1/asn/lookup`	Secret key	Lookup by `?ip=` query parameter
GET	`/v1/asn/lookup/{ip}`	Secret key	Lookup by IP in the URL path
GET	`/v1/asn/status`	Public or secret key	Plan limits and quota snapshot

Response headers

Successful and error responses may include:

Header	Description
`X-Request-Id`	Unique ID for support and log correlation
`X-RateLimit-Limit`	Plan requests per minute for this key
`X-RateLimit-Remaining`	Requests left in the current minute window
`X-RateLimit-Reset`	Unix timestamp when the minute window resets
`X-Quota-Limit`	Monthly quota for the subscription
`X-Quota-Remaining`	Lookups left this calendar month (UTC)
`X-Quota-Period`	Current quota month (`YYYY-MM`)
`Retry-After`	Seconds to wait after HTTP 429

GET /v1/asn/lookup

Returns ASN and network classification for a single public IP address.

Request

Pass the target IP using one of these forms:

GET /v1/asn/lookup/8.8.8.8
GET /v1/asn/lookup?ip=8.8.8.8

Both IPv4 and IPv6 are supported. IPv6 addresses in the path should be URL-encoded.

Headers:

Authorization: Bearer as_sec_YOUR_SECRET_KEY

Success response (200)

{
  "success": true,
  "ip": "8.8.8.8",
  "cached": true,
  "fetched_at": "2026-07-15 12:00:00.000",
  "asn": 15169,
  "as_org": "GOOGLE, US",
  "network": "8.8.8.0/24",
  "country_code": "US",
  "registry": "arin",
  "allocated": "1992-12-01",
  "network_type": "hosting",
  "request_id": "e6d04020be9b57b1e1069d6e483c0443"
}

Network type values

network_type is a lightweight heuristic based on organization name keywords:

Value	Typical signals
`hosting`	hosting, cloud, vps, datacenter, colocation
`education`	university, edu
`government`	government, gov
`isp`	telecom-style orgs that are not classified above
`unknown`	No clear match

Treat network_type as a coarse hint for fraud and access control, not a definitive industry classification.

Response fields

Field	Type	Description
`ip`	string	Normalized IP that was looked up
`cached`	boolean	`true` when Syndaq already holds a recent result for this lookup
`fetched_at`	string	When this result was last retrieved
`asn`	integer \	null	Autonomous system number
`as_org`	string \	null	AS organization name
`network`	string \	null	Announced prefix / CIDR covering the IP
`country_code`	string \	null	ISO country code when available
`registry`	string \	null	RIR label when available (for example `arin`)
`allocated`	string \	null	Allocation date string when available
`network_type`	string	`hosting`, `isp`, `education`, `government`, or `unknown`

GET /v1/asn/status

Returns key status, plan limits, and quota usage without performing a lookup.

Request

GET /v1/asn/status
Authorization: Bearer as_sec_YOUR_SECRET_KEY

The public key (as_pub_) is accepted on this route.

Success response (200)

{
  "success": true,
  "status": "active",
  "product": "asn",
  "plan": "starter",
  "rate_limit_per_minute": 120,
  "monthly_quota": 10000,
  "quota_unlimited": false,
  "quota_remaining": 9842,
  "quota_period": "2026-07",
  "database_records": 210000
}

Errors

Failed requests return JSON with success: false, error, error_code, and usually request_id.

HTTP	error_code	Typical cause
400	`invalid_ip`	Missing or malformed IP address
401	`missing_credentials`	No API key provided
401	`invalid_api_key`	Unknown, inactive, or revoked key
401	`wrong_key_type`	Public key used on a lookup endpoint
403	`ip_not_allowed`	Caller IP not on the key allowlist
422	`ip_not_routable`	Private, reserved, or non-routable IP
429	`rate_limit_exceeded`	Per-minute limit exceeded
429	`quota_exceeded`	Monthly quota exhausted
502	`lookup_failed`	Temporary lookup failure
500	`internal_error`	Unexpected server error

Handle non-200 responses in your application and retry transient errors with exponential backoff.