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Free tool
Inspect any IPv4 or IPv6 address: version, allocation, whether it is globally routable, and what it discloses to a destination server. Reserved and private ranges are labelled, and nothing is guessed.
Reading your address…
Scope
Two of the four columns in the result are exact. The other two are frequently unresolved, and the reason is worth stating plainly.
No GeoIP database is queried here
Address family, canonical form, the special-purpose allocation an address falls in, and whether it is globally routable. These come from published registries, not from a feed that can drift.
The country for your own address, from Cloudflare's edge resolution, and operator details for a small curated set of allocations whose owner publishes them — public resolvers, essentially.
City, coordinates, ASN and operator for an arbitrary address, plus proxy, VPN and hosting classification. Each needs a licensed dataset or a maintained reputation feed that is not part of this build.
What an address discloses
None of these require JavaScript, cookies or an account. They are what a target has to work with the moment a TCP connection opens, and they decide how the rest of the session is treated.
| Signal | What it reveals | Why it matters |
|---|---|---|
| Address family | IPv4 or IPv6, and the size of the allocation it sits in | Many targets treat IPv6 as cheaper to block wholesale, because a single customer can hold a /64. |
| Allocation type | Whether the address is public unicast, private, carrier NAT, link-local or reserved | Reserved space appearing as a client source means a spoofed header or a broken proxy chain, not a real visitor. |
| Network operator | The organisation the registry allocated the range to | A consumer ISP, a mobile carrier and a cloud provider carry very different default reputations at the same target. |
| Autonomous system | The AS number announcing the route | Anti-bot vendors score at ASN granularity, so one noisy tenant can affect every address in the same AS. |
| Country and region | Roughly where the operator serves the address | It decides which storefront, price and language you are shown, which is the entire premise of price monitoring. |
| Reverse DNS | The PTR record, when the operator publishes one | Generic dynamic-style rDNS is used heuristically by several blocklists, so untidy naming alone can get an address listed. |
Reverse DNS is listed because it is read by blocklists, not because this tool resolves it — PTR lookups need a live resolver, which these endpoints do not use. The IP blacklist check builds the queries you can run yourself.
Reserved space
The tool flags every IANA special-purpose allocation because none of them can legitimately be the source of a connection arriving from the public internet. If your access log shows 10.0.0.4 as a client, one of three things happened: a reverse proxy in front of the application is not forwarding the real address, the application is reading the wrong header, or somebody supplied an X-Forwarded-For value by hand and it was trusted.
The most consequential range in the list is 169.254.169.254. It is ordinary link-local space, and every major cloud serves instance credentials from it. Any feature that fetches a URL supplied by a user — a webhook tester, an avatar importer, a proxy checker — has to refuse it before connecting, along with every other reserved range and every address a supplied hostname resolves to.
That is exactly how our own proxy tester is written: it denies by default, allows only addresses that match no special-purpose allocation, re-checks every answer a hostname resolves to, and then connects to the vetted literal rather than the name.
Inventory
Pool sizes below are the advertised counts for our largest markets, read from the same inventory the location pages use.
Browse every locationHow to use it
Open the tool. It inspects the address your request arrived from and shows what that address discloses, with no input required.
Paste any IPv4 or IPv6 address into the field and run the lookup. Leading zeros and interface zone identifiers are rejected, because different resolvers read them differently.
Confirm whether the address is globally routable or sits in reserved, private or carrier-NAT space. A reserved address in a client log is a configuration problem, not a visitor.
The result lists what could not be resolved and which dataset would be needed to resolve it, so you know exactly which parts of the answer are measured and which are absent.
Questions
Next: IP blacklist check builds the DNSBL queries for an address, and the proxy tester measures latency and the exit address of an endpoint.
Residential, ISP, mobile and datacenter egress with country, city and ASN targeting on the same credential. Start on 50MB of free residential bandwidth and check the exit address with these tools.
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