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IP Tools

Turn an address into context: who announces it, which ASN and prefix it belongs to, where it geolocates, and how it fits into your addressing plan.

How these tools run · IP geolocation uses the public ip-api.com service; WHOIS/RDAP uses the rdap.org bootstrap and follows redirects to the authoritative RDAP server; the Subnet Calculator and Multicast MAC Checker are pure local arithmetic with no network calls; BGP Route View queries public route-data services.

Tools in this category

IP Lookup

Ownership, ASN, prefix and geolocation for any address.

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WHOIS / RDAP

Registry data for domains, IP ranges and ASNs.

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Subnet Calculator

CIDR ranges, masks, host counts and splits.

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BGP Route View

Announced prefixes, origin AS and upstream peers.

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My IP

Your public address, resolver and connection details.

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IPv6 Readiness

Dual-stack coverage for a domain and its services.

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Multicast MAC Checker

Map multicast IPv4 addresses to Ethernet MACs and reverse the 23-bit aliasing.

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Related guides

In-depth articles that cover ip tools in more detail.

A Practical Subnet Calculation Cheat Sheet

CIDR math is just binary arithmetic with a confidence problem. Walk through the core calculations — host counts, ranges, and splits — with worked examples you can reuse.

Editorial note

Maintained by the networkutils.org editorial team. Tool descriptions and methodology on this page reflect the live implementation in the NetworkUtils.org backend. Last updated September 2026.