Find the Company From an IP Address: 4 Free Methods

Find the Company From an IP Address: 4 Free MethodsThe fastest free way to find the company behind an IP address is a WHOIS query at ipinfo.io — it returns the leasing organization and ASN in one lookup. For higher accuracy, cross-reference with BGPView (ASN owner) and reverse DNS.You've got an IP and want to know the company. Here are the four free methods, ranked by accuracy.## Method 1 — ipinfo.io (Recommended) [ipinfo.io](https://ipinfo.io) is the easiest option. Paste the IP, get: - **org** — the leasing organization (e.g. 'AS16509 Amazon.com, Inc.') - **ASN** — the routed network operator - **hostname** — reverse DNS - **city / country** — geolocation Free tier covers 50k lookups/month.## Method 2 — WHOIS via the RIRs Regional Internet Registries hold the authoritative allocation records: - **ARIN** — [whois.arin.net](https://whois.arin.net) — North America - **RIPE** — [apps.db.ripe.net](https://apps.db.ripe.net) — Europe / Middle East - **APNIC** — [wq.apnic.net](https://wq.apnic.net) — Asia Pacific - **LACNIC** — Latin America - **AFRINIC** — Africa All free, no login. Query returns the block owner, allocation date, and abuse contact.## Method 3 — BGPView for the ASN Owner [BGPView](https://bgpview.io) exposes the AS-level ownership. Every IP belongs to a network prefix that's announced by an ASN. The ASN's registered owner is often the true operator — even when WHOIS shows a hosting reseller. Use this to distinguish: - **Corporate ASN** — 'AS12345 Acme Corp' → almost certainly Acme's traffic - **ISP ASN** — 'AS7922 Comcast' → consumer traffic, cannot identify the household - **Cloud ASN** — 'AS16509 Amazon' → resolve further via the customer's cloud tenant## Method 4 — Reverse DNS (PTR) `dig -x <ip>` returns the PTR record if set. Corporate operators frequently self-identify: - `mail-01.acme.com` → Acme Corp mail server - `nat-us-east.acme.com` → Acme office NAT gateway - `ip123.corp.example.com` → Example Inc corporate LAN Not authoritative — an operator can put anything in a PTR — but a strong hint when it agrees with WHOIS + ASN.## Combining Signals for Accuracy Any single method has blind spots. Combining them boosts accuracy: - If **ipinfo.io + ASN + reverse DNS all agree** → confidence high - If **only WHOIS** returns a company → medium confidence - If **only ISP** → cannot identify the specific company Production B2B visitor identification does this fusion at scale in real-time. See [How Identification Works](/help/how-identification-works).Steps

Method 1 — ipinfo.io Paste the IP into ipinfo.io. Returns org, ASN, hostname, city, country. Free, no login.

Method 2 — WHOIS via ARIN / RIPE For the raw allocation record, query the regional registry. ARIN for North America, RIPE for Europe. Free.

Method 3 — BGPView for ASN owner bgpview.io shows the ASN, its owner, and the network prefixes it announces. Best for distinguishing corporate-owned ASNs from ISP-owned.

Method 4 — reverse DNS Run `dig -x <ip>` or use viewdns.info/reversedns to fetch the PTR record. Corporate mail/web servers usually reveal themselves.

Frequently asked questionsWhich free tool gives the best accuracy?ipinfo.io wins for one-off B2B lookups — its business-IP dataset is well-maintained. For raw truth, ARIN/RIPE WHOIS is authoritative but noisier. For scale, use a business-IP database.What if the IP resolves to an ISP?That means the IP is dynamic/consumer — it belongs to a shared pool. You cannot identify the specific company behind a single ISP IP. Business-hour desktop traffic from corporate networks is the sweet spot for identification.Can I find the person behind an IP?No — that's not possible from public data, and even law enforcement needs a subpoena to compel an ISP to disclose the subscriber. Anyone claiming to identify individuals from IP alone is misleading you.How do I automate this for CRM enrichment?Use the IPinfo API, MaxMind GeoIP2, or route through LemReveal's [Company Lookup](/tools/company-lookup) which layers business-IP data on top of 40+ national registries.

LemReveal: B2B Visitor Identification & Sales Intelligence PlatformLemReveal identifies companies visiting your website with confidence scoring, 8 buying timing signals, and AI-generated talking points. GDPR compliant B2B lead generation from $0/mo.Core Features