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Prefix tools

Merge prefix lists, turn address ranges into CIDRs, expand and compress IPv6 addresses, and find the reverse DNS zones of a prefix.

One prefix, range or address per line, up to 5000. Overlaps and neighbours are merged.

First and last address, IPv4 or IPv6.

IP address, AS and network data from the RIPE NCC and the other regional internet registries. Updated every day.

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© 2026 IP-FD.net Registry data © RIPE NCC, APNIC, AFRINIC, ARIN, LACNIC. Routing data from the RIPE NCC Routing Information Service. City names from GeoNames (CC BY 4.0). Measurements from RIPE Atlas. Abuse reports from AbuseIPDB. Maps © OpenStreetMap contributors.