Lookup

Paste a MAC address, IP, domain, ASN or file hash. We work out what it is and answer what we can locally, then hand you the deep links worth clicking.

whatis

MAC vendors come from a local copy of the IEEE registry and ASN data from Team Cymru's DNS interface — no third-party API sees what you type here. The external links below are just links; nothing is fetched until you click one.

what this understands

MAC / OUI

Vendor from the local IEEE registry, plus whether the address is locally administered (i.e. randomised, so the vendor is meaningless).

try one

IP address

Scope, reverse DNS and the announcing ASN with its prefix, country and registry.

try one

Domain

A, AAAA, MX, NS, TXT and CNAME records, then links to certificate transparency and DNS history.

try one

ASN

Straight to the routing tables — peers, prefixes and IX presence.

try one

File hash

MD5, SHA-1 or SHA-256 through to VirusTotal and MalwareBazaar.

or submit the file

Our own data

Indicators are cross-checked against files submitted to the dump page, so you find out if we have seen it before.