IP Intelligence,
from the network up.
Owner, ASN, geolocation, reverse DNS, live BGP, and VPN / proxy / threat classification for every IPv4 address — returned as clean JSON in sub-second responses.
From any shell: curl worldip.io/8.8.8.8 — quick, free details on any IP, no key, no signup. Rate-limited per your IP · ~10× the volume with a free account.
# Your IP — free, no key, no signup:
curl -s worldip.io{
"ip": "216.73.216.139",
"ptr": null,
"forward_dns": null,
"asn": { "number": 16509, "name": "Amazon.com, Inc." },
"org": { "name": "Amazon.com, Inc." },
"country": { "code": "US", "name": "United States" },
"region": "Ohio",
"city": "Columbus",
"cidr": "216.73.216.0/22"}That's your IP — free, no key. Org/ASN enrichment, /24 neighbors, VPN/proxy/datacenter detection, trust score, BGP, hosted domains, or higher volume? The standard API (key required) has it — /developers.
From full descriptive data to live network intelligence
The free tier returns the core descriptive picture — geolocation, reverse + forward DNS, ASN and org name, and CIDR — for every IP. Paid tiers add ASN/org enrichment, /24 neighbors, more queries and the threat-intelligence layer: proxy, VPN and datacenter classification, trust scores, and live BGP/RPKI.
Descriptive data
- Owner, organization name & ASN
- Country, region & city geolocation
- Reverse DNS (PTR) & forward DNS
- CIDR / routed prefix
More scale
- Everything in Free, metered for volume
- 25,000 enriched lookups / month
- Full descriptive dataset per call
- Unlimited basic lookups, no daily cap
Privacy & threat
- VPN, proxy, Tor & datacenter flags
- Residential & mobile proxy detection
- Access type & trust score
- Botnet & compromised-host reputation
Network intelligence
- Live BGP prefixes & MOAS
- Routing anomalies & RPKI validation
- Organization footprint & bulk lookups
- High volume, snapshots & priority support
First-party data, not a reseller feed
WorldIP runs the collection pipeline end to end — so the data is fresh, explainable, and ours to stand behind.
Our own global scanning fleet
A globally-distributed, multi-region fleet continuously scans the full IPv4 space for reverse DNS (PTR) and forward DNS, re-checking every address as its TTL expires — billions of records kept current, not a stale annual dump.
Live BGP from RIPE RIS
We ingest the global routing table live from 23 RIPE RIS route collectors peering across every continent, so prefixes, MOAS events, RPKI validity and routing anomalies reflect the internet as it is right now.
Authoritative registry refresh
MaxMind GeoLite2 imports weekly, the five RIR delegation files every six hours, and ipinfo Lite daily — all cross-validated so allocation, ownership and country data stay accurate between refreshes.
Every signal about an address, cross-linked
One request returns the full picture — from physical geolocation to live routing and proxy risk.
Built for the teams that live in IP data
Security & OSINT
Score risk, unmask VPNs, proxies and Tor exits, and pivot from an IP to its owner, routing and hosted domains during investigations and abuse triage.
Network engineering
Watch your prefixes for hijacks, MOAS and RPKI-invalids, audit organization footprints, and validate routing against the live global table.
Developers & enrichment
Enrich signups, payments and traffic with owner, geo and access-type in one sub-second JSON call — with a free tier to build against today.
Search 4.3 billion addresses, free and without an account
Look up any IP, domain, CIDR, ASN, organization or country — or browse the whole IPv4 space by category.
Browse the database
From the blog
All posts →Frequently Asked Questions
What is an IPv4 address?
An IPv4 address is a 32-bit numeric identifier assigned to every device connected to the internet. Written as four numbers separated by dots (e.g., 8.8.8.8), there are approximately 4.3 billion possible IPv4 addresses. Each one is allocated to an organization, ISP, or government entity.
How do I look up who owns an IP address?
Enter any IPv4 address in the search bar above. WorldIP.io shows the owning organization, ASN (Autonomous System Number), geographic location, CIDR range, and reverse DNS record for every allocated IPv4 address.
What is an ASN?
An Autonomous System Number (ASN) identifies a network that independently manages its own routing policy. ISPs, cloud providers, and large enterprises each have one or more ASNs. WorldIP.io tracks over 80,035 active ASNs.
What is a CIDR range?
CIDR (Classless Inter-Domain Routing) notation like 8.8.8.0/24 describes a block of IP addresses. The number after the slash indicates how many addresses are in the block. A /24 contains 256 addresses, a /16 contains 65,536, and a /8 contains 16.7 million.
What is a reverse DNS (PTR) record?
A PTR record maps an IP address back to a hostname. For example, 8.8.8.8 resolves to dns.google. PTR records are used for email authentication (SPF/DKIM), network diagnostics, and identifying the services running on an IP address.
Is WorldIP.io free?
Yes. All IP lookups, searches, and data on WorldIP.io are completely free with no signup required. Our data is sourced from MaxMind GeoLite2, regional internet registries, and our own DNS scanning infrastructure.
