IP Lookup
What is an IP Lookup?
An IP lookup takes an IP address — or a domain name that resolves to one — and reports what is publicly known about it: its approximate geographic location, the internet service provider or hosting company that operates it, the organization it is allocated to, its hostname (reverse DNS), and whether it appears on any reputation or blocklists. Every device on the internet has an IP address, and the infrastructure that hands out and tracks those addresses keeps public records — which is what this tool reads.
There are two halves to an IP lookup. The first is geolocation: commercial and open databases (such as MaxMind's GeoLite2, IP2Location, and DB-IP) map IP ranges to countries, regions, cities, and approximate coordinates. This mapping works because IP addresses are allocated in large blocks to ISPs and hosting providers serving specific areas. It is approximate by nature — typically accurate to the city level for broadband ISPs, but often just the country level for mobile networks, corporate VPNs, and cloud servers. Anyone promising street-level precision from an IP address alone is overselling; what you get is a neighborhood-scale estimate at best, and frequently just the location of the ISP's point of presence.
The second half is registration data: the five Regional Internet Registries (ARIN for North America, RIPE for Europe/Middle East/Central Asia, APNIC for Asia-Pacific, LACNIC for Latin America, AFRINIC for Africa) publish WHOIS records showing which organization holds each IP block, with technical and abuse contacts. Unlike domain WHOIS, this data is generally not privacy-redacted, because it describes organizations, not individuals. This is the data abuse teams use when reporting spam, attacks, or copyright infringement — it tells you who to contact about misbehavior from an address.
An IP lookup also commonly includes reverse DNS (the PTR record mapping the IP back to a hostname) and reputation signals: whether the address sits on email blacklists (DNSBLs like Spamhaus), whether it belongs to a known VPN, proxy, Tor exit, or datacenter range, and what its ASN (Autonomous System Number) is. The ASN identifies the network operator — useful for distinguishing "this visitor is on a residential ISP" from "this visitor is coming from a cloud server," a distinction fraud teams rely on heavily.
Our free IP lookup combines all of this into one report: geolocation, ISP and organization, ASN, hostname, and registry data for any IPv4 or IPv6 address. Enter a domain instead and it resolves first, then looks up the resulting address. Your queries are processed instantly and never stored. It complements our DNS lookup (which shows the forward records pointing at the IP) and our WHOIS lookup (which covers domain registration rather than IP allocation).
How to Use the IP Lookup Tool
Investigating any IP address takes seconds:
- Enter an IP address or domain. Type an IPv4 address (e.g.
8.8.8.8), an IPv6 address, or a domain name into the input field. If you enter a domain, the tool resolves it to its IP address first and then performs the lookup on that address. - Run the lookup. Click the lookup button. The tool queries geolocation databases and the appropriate Regional Internet Registry in parallel, assembling the full report in a few seconds.
- Read the location data. Note the country, region, city, coordinates, and timezone. Treat city-level data as approximate — it reflects where the IP block is registered or where the ISP's equipment sits, not necessarily where the person or server physically is. Mobile and VPN addresses routinely geolocate to the wrong city.
- Identify the operator. Check the ISP/hosting provider, the organization name, and the ASN. A residential ISP name suggests a home user; a cloud provider (AWS, Hetzner, DigitalOcean) suggests a server; a known VPN or hosting ASN on what claims to be a "local customer" deserves skepticism.
- Check the hostname and reputation. The reverse-DNS hostname often reveals the server's role (
mail.,server., node names). Reputation flags — blocklist listings, proxy/VPN/Tor identification — tell you whether the address has a history of abuse. - Follow up as needed. Investigating an attack? Use the registry abuse contact from the report. Tracing a website's infrastructure? Combine with our DNS lookup to see all records pointing at the address, and our SSL lookup to check the certificate served from it.
Key Features of the IP Lookup
IPv4 and IPv6 support. The tool handles both address families, including compressed IPv6 notation — increasingly important as IPv6 adoption keeps climbing and more of your traffic arrives on v6 addresses.
Geolocation with honest precision. Country, region, city, latitude/longitude, and timezone are reported from current geolocation databases, with the understanding (stated in the report) that IP geolocation is approximate. Accuracy is strongest at country level (typically 95%+) and degrades toward city level.
ISP, organization, and ASN. See who operates the address block: the ISP or hosting company, the registered organization, and the Autonomous System Number with its network name — the three identifiers network professionals actually use to characterize an address.
Reverse DNS hostname. The PTR record is resolved and displayed, often revealing the machine's purpose or provider (mail servers, CDN edge nodes, and cloud instances usually have descriptive reverse names).
Registry WHOIS data. The relevant Regional Internet Registry record is shown — allocation date, block range, and abuse contact — the same data security teams use to file reports about malicious addresses.
Reputation indicators. Flags for known proxies, VPNs, Tor exits, datacenter ranges, and blocklist appearances help you judge whether an address is a residential user, a server, or something trying to hide.
Private by design. No signup required. Your lookups are processed instantly and never stored or logged.
| Field | What it tells you | Typical accuracy / notes |
|---|---|---|
| Country | Where the IP block is registered/used | Very high (~95%+) — reliable for geo-blocking and compliance |
| Region / City | Approximate metro area | Moderate — often the ISP's hub, not the user's location |
| ISP / Organization | Who operates the network | High — from registry allocation data |
| ASN | The autonomous system (network) number | Exact — definitive network identifier |
| Hostname (PTR) | Reverse-DNS name of the address | Exact record, but optional — many IPs have none |
| Connection type | Residential, mobile, datacenter, VPN/proxy | Heuristic — useful signal, not proof |
IP Lookup Use Cases
Developers and security engineers
The problem: Your logs show a burst of failed login attempts, aggressive scraping, or spam signups from a set of IP addresses. You need to decide quickly: block, rate-limit, challenge with CAPTCHA, or ignore?
How this tool helps: Look up the offending addresses. The ASN and organization tell you whether you are dealing with a residential ISP (possibly a compromised home machine), a cloud provider (likely an automated attack from a rented VPS — reportable to the provider's abuse contact, shown in the registry data), or a known VPN/proxy range (consider stricter verification for these). Geolocation anomalies — logins from two countries minutes apart — confirm credential-stuffing. This triage turns raw log lines into actionable decisions in seconds.
SEO specialists and marketers
The problem: A client's site traffic shifted countries unexpectedly, or you need to verify that a CDN is actually serving visitors from nearby edge locations. Alternatively, you are vetting a link prospect and want to know whether ten "different" sites are all on the same server — a footprint of a link network.
How this tool helps: Resolve each domain and look up the IPs: shared hosting IPs and identical ASNs across supposedly independent sites are classic private-blog-network signals. For performance questions, the geolocation and ASN confirm whether traffic is hitting the expected CDN edge or falling back to an origin server on another continent — a finding worth handing to the hosting team alongside a DNS lookup of the domain's records.
Students and curious users
The problem: You have heard that "websites know your location," and you want to understand what an IP address actually reveals — and what it does not. Or you are just curious where in the world a particular server sits.
How this tool helps: Look up your own public IP address (search "what is my ip" if you do not know it) and see what the internet infers: usually your city or a nearby one, your ISP's name, and nothing like your name or street address. Then look up a few favorite websites' domains and compare — you will quickly develop an accurate mental model of IP geolocation's powers and, just as importantly, its limits.
Understanding the Limits of IP Data
An IP lookup is powerful, but its power has sharp edges. Knowing exactly what the data can and cannot prove keeps you from drawing confident, wrong conclusions — the kind that wrongly accuse someone or misdirect an investigation.
Geolocation is an estimate, not a fact. Databases map IP blocks to locations based on registration data, ISP disclosures, and measurement. A block registered to an ISP's headquarters may serve customers three cities away; mobile carrier IPs often resolve to a distant switching center; corporate VPN exits appear wherever the VPN concentrator lives. Treat city-level results as "probably within this metro area" and be skeptical of any conclusion that depends on precision finer than that. Country-level data is the reliable layer — good enough for licensing, compliance, and fraud screening.
An IP address identifies a connection, not a person. Behind one public IP there may be an entire household, office, café, or mobile tower's worth of users (carrier-grade NAT routinely puts thousands of mobile subscribers behind a handful of addresses). Conversely, one person cycles through many IPs across home, work, and mobile networks. Banning or accusing "the user at this IP" conflates the address with the individual — a category error that has caused real-world harm in moderation and legal contexts. Corroborate with account-level evidence before acting against a person.
Hosting ASNs change the meaning of location. When the ASN belongs to AWS, Hetzner, OVH, or another cloud provider, the geolocation tells you where the datacenter is, not where the operator sits. A "Russian" IP on a German host is a server in Germany rented by anyone, anywhere. Fraud systems weight this correctly — datacenter origin on a supposedly residential action is itself the signal — but human investigators must read the ASN before the city.
VPNs, proxies, and Tor deliberately falsify the picture. Reputation flags identify known anonymization infrastructure, but new or private VPN endpoints will not be flagged. Absence of a VPN flag is not proof of absence of a VPN. For high-stakes decisions (financial fraud, account takeover), treat geolocation as one input among many — device fingerprints, behavioral signals, and account history carry more weight.
Databases go stale. IP blocks are bought, sold, and reallocated; a block that belonged to a Brazilian ISP last year may serve a US cloud region today. Reputable databases update continuously, but there is always lag. If a lookup result contradicts strong ground truth (the company's own documentation says the server is in Frankfurt, the database says São Paulo), trust the ground truth and consider reporting the correction to the database vendor.
IPv6 is less mapped than IPv4. Two decades of IPv4 mapping effort do not fully transfer: IPv6 geolocation databases are younger, addresses are more numerous and more dynamically assigned, and privacy extensions rotate client addresses regularly. Expect coarser results on v6 and calibrate your confidence accordingly.
The professional's rule: IP data is excellent for network-level questions (which provider, which country, is this a datacenter, who do I contact about abuse) and merely suggestive for human-level questions (who, exactly where). Use it for the former confidently; corroborate the latter always.
Frequently Asked Questions
What does an IP lookup reveal?
An IP lookup reveals publicly registered information about an IP address: approximate geolocation (country, region, city, coordinates, timezone), the ISP or hosting provider, the organization the address block is allocated to, the Autonomous System Number (ASN), the reverse-DNS hostname, the Regional Internet Registry record with abuse contacts, and reputation signals such as VPN/proxy/Tor identification or blocklist listings. It does not reveal the name, street address, or identity of the person using the address.
How accurate is IP geolocation?
Country-level accuracy is very high — typically around 95% or better — which is why it is trusted for content licensing, geo-blocking, and fraud screening at the country level. City-level accuracy is much weaker: the database usually knows where the ISP's equipment or the IP block's registration point is, which can be a different city (or even country) from the actual user. Mobile networks, corporate VPNs, satellite internet, and cloud servers are the least accurate cases. Treat city data as "somewhere in this metro area, probably" rather than a pinpoint.
Can someone find my exact address from my IP?
No — not from the IP address alone. Public geolocation databases resolve to, at best, a city or neighborhood estimate, and frequently just the ISP's regional hub. Your precise location is known only to your ISP (which maps your account to your address internally) and is disclosed only under legal process. That said, your IP does reveal your ISP, your approximate area, and — combined with other tracking data — contributes to device fingerprinting, which is why privacy-conscious users employ VPNs.
What is an ASN?
An ASN (Autonomous System Number) is a unique number assigned to a network operator — an ISP, cloud provider, university, or large company — that identifies its network in global internet routing (BGP). For example, all of a provider's IP blocks announce themselves under its ASN. In a lookup report, the ASN is the most reliable single identifier of "whose network is this," more stable than organization names, and network engineers use ASNs constantly for peering, troubleshooting, and abuse reporting.
What is reverse DNS (PTR record)?
Reverse DNS maps an IP address back to a hostname — the opposite direction of normal DNS. It is stored in PTR records managed by whoever controls the IP block (usually the ISP or hosting provider, not the domain owner). Mail servers rely on it heavily: many receiving servers reject or penalize mail from IPs whose PTR record is missing or does not match the sending hostname. In a lookup report, the PTR hostname often hints at the machine's role, such as mail.example.com or a cloud instance name.
Why does my IP show the wrong city?
Several common reasons: your ISP routes your traffic through a hub in another city; you are on a mobile network whose IPs are registered at the carrier's headquarters; you are using a VPN, corporate network, or proxy that exits elsewhere; or the geolocation database simply has stale data for your IP block (blocks get reallocated, and databases take weeks to catch up). If the country is right but the city is off by 50–200 km, that is normal database behavior, not an error worth reporting.
What is the difference between IPv4 and IPv6?
IPv4 addresses are 32-bit numbers written as four decimal groups (e.g. 192.0.2.1), providing about 4.3 billion addresses — effectively exhausted, which is why NAT and address sharing are everywhere. IPv6 addresses are 128-bit numbers written as eight hexadecimal groups (e.g. 2001:db8::1), providing a effectively unlimited supply. Our lookup handles both. Practically, IPv6 geolocation databases are younger and slightly less precise at city level, and many networks still run dual-stack (both protocols side by side).
How do I report abuse from an IP address?
Use the lookup to find the address's Regional Internet Registry record, which includes an abuse contact email (often abuse@provider.example). Send a concise report: the offending IP, timestamps with timezone, log excerpts showing the abusive behavior, and what you have already done (blocked, etc.). For large-scale attacks, also consider reporting to blocklist operators and, for criminal activity, law enforcement. The registry abuse contact is the officially designated channel — it reaches the team that can actually disconnect the offender.