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Network tools / Network & Developer Tools
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Network & Developer Tools

Free online tools for IP and ASN lookup, subnet calculations, DNS, JSON formatting and text comparison. Find the right tool for your next task.

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Network Tools

IP Lookup

Look up a public IPv4 address to find its country, autonomous system number, network organization, and ASN address range.

ASN Lookup

Find ASN registration, organization and allocation information from the responsible RDAP registry.

CIDR Calculator

Calculate IPv4 subnet ranges, subnet masks, and address counts. Convert an IP range into the smallest set of CIDR blocks.

Subnet Calculator

Split an IPv4 network into smaller subnets using a CIDR prefix or dotted subnet mask.

DNS Lookup

Query public DNS records including A, AAAA, MX, TXT, NS, CNAME, SOA, CAA and SRV.

Reverse DNS

Look up PTR records for a public IPv4 or IPv6 address.

WHOIS Lookup

Look up domain or IP registration information through modern RDAP services.

MCC / MNC

Find country and mobile network operator assignments using MCC and MNC codes from the ITU E.212 register.

Dev Tools

JSON Formatter

Format, validate and minify JSON locally without changing large numbers or duplicate keys.

Base64 Encode/Decode

Encode UTF-8 text as Base64 or decode standard Base64 back to text locally.

UUID Generator

Generate cryptographically random version 4 UUIDs directly in your browser.

Unix Timestamp Converter

Convert Unix seconds or milliseconds to UTC and local time, or turn an ISO 8601 date into a Unix timestamp.

Hash Generator

Generate SHA-256, SHA-384, SHA-512 or legacy SHA-1 hashes from UTF-8 text.

Text Diff

Compare two texts side by side. Highlight added and removed lines and character changes directly in your browser.

Tools for everyday technical work

Start with a question

Check who operates an IP network, plan an IPv4 subnet, or compare two versions of a configuration. Choose a tool below to get started.

Know where your input goes

CIDR, subnet, text diff, JSON, Base64, UUID, timestamp and hash tools run in your browser. Network lookups send your query to the lookup service. See our Privacy Policy for advertising and cookie information.

Check the source, not just the result

IP country and ASN data is powered by IPLocate.io under CC BY-SA 4.0. MCC/MNC assignments follow the ITU E.212 register. Lookup results can change over time; verify important decisions against the original source.