Find the network that announces an IP address on the internet: its AS number, name, the prefix it routes and where it is registered.
Examples:
How to Use
An IPv4 or IPv6 address, a domain (its first A record is used) or an AS number like AS13335.
Results come from Team Cymru's IP to ASN service, which follows the global routing table.
Use the network name to find the right abuse contact or to group addresses by provider.
IP & Network
Every network that routes its own addresses on the internet has an Autonomous System Number. When you look up an IP, you find the AS that currently announces the prefix containing it: an ISP, a cloud, a hosting company or a large business.
The prefix is the block as it is routed, which may be smaller than what the registry allocated. The country and date come from the regional internet registry (ARIN, RIPE NCC, APNIC, LACNIC or AFRINIC).
To know where traffic comes from. Floods and scans aimed at your network often come from a handful of hosting ASNs, and blocking or rate-limiting by AS is far easier than by single address. The reverse is also true: if another provider sends you an abuse report, it will name your ASN.
Free Tools
Frabs watches every VM's outbound traffic and stops spam, scans and floods before the abuse report arrives.