Network

NetLookup

Twelve network tools, one fast toolkit.

NetLookup brings together the network, DNS and security checks engineers reach for every day — from ping and traceroute to SSL, security headers and blacklist lookups — free, with no signup and a JSON API for automation.

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12 tools, 3 categories

No signup, 100% free

Browser UI + JSON API

Overview

One toolkit instead of a dozen tabs.

Diagnosing a network or domain problem usually means bouncing between a handful of single-purpose sites. NetLookup puts the twelve checks engineers actually reach for into one fast, free place — no signup, no ads, no clutter.

Paste a domain, IP or URL and it works out what you gave it. Run a single tool, or let Domain Audit fire DNS, WHOIS, SSL, security headers and blacklist checks in parallel and grade the result. Every tool is also available over a simple JSON API, so the same checks can run inside your own scripts and monitors.

Under the hood it queries trusted resolvers — Google, Cloudflare, Quad9, OpenDNS and NextDNS over DoH — and uses MaxMind GeoLite2 for IP geolocation, so the answers you get are ones you can rely on.

Features

What's inside

Network tools

What Is My IP, IP Address Lookup, Ping, Traceroute, Port Checker and a Subnet Calculator — the essentials for checking reachability and addressing.

DNS & domain tools

DNS Lookup, a DNS Propagation Checker across 10+ DoH resolvers, and WHOIS Lookup to see records, propagation and ownership.

Web & security tools

An SSL Certificate Checker, a graded HTTP & Security Headers report, and Blacklist (RBL) Lookup against 22 major DNSBLs.

Smart input & Domain Audit

Paste a domain, IP or URL and NetLookup detects the type automatically. Domain Audit runs DNS, WHOIS, SSL, headers and RBL in parallel and grades the result.