Client IP API
Find the real client IP behind proxies, CDNs and load balancers. The client endpoint takes an X-Forwarded-For list (or an RFC 7239 Forwarded header) together with a count of proxies you trust, and returns the actual client address — stripping the trusted proxies from the right-hand side so that a spoofed left-most value cannot fool you — along with the full ordered hop chain, the left-most and right-most entries and the address family. The parse endpoint decomposes a Forwarded header into its for/by/host/proto hops, or an X-Forwarded-For header into its ordered list of addresses, stripping ports and IPv6 brackets so you get clean IPs. Getting this right matters for security: trusting the wrong entry lets clients spoof their IP, so the trusted-proxy model returns the first address you did not put there yourself. Everything is computed locally and deterministically, so it is instant and private. Ideal for reverse proxies and API gateways, rate limiting and abuse prevention, audit logging and analytics, geo and fraud checks, and any backend sitting behind a load balancer. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This parses forwarding headers to find the client IP; to geolocate that IP use an IP-geolocation API.
api.oanor.com/clientip-api
