Network tools and guides that just work.
NetworkCheckr gives you free, browser-based utilities for checking IPs, looking up DNS records, and calculating subnets. You can also check which AI crawlers can reach your site, and learn how networks work. No signups, no installs, no nonsense — just open and use.
$myip
Your public IP, location, and ISP — instantly, no signup required.
Popular tools and guides
Tool
Check which AI crawlers your robots.txt allows, and validate llms.txt.
Tool
Locate any IP or domain — city, ISP, ASN, and timezone.
Tool
Find the vendor behind any MAC address.
Tool
Network range, broadcast, and usable hosts from any CIDR.
Tool
Query A, AAAA, MX, TXT, and CNAME records for any domain.
Guide
OUI vendors, randomization, and how to find yours.
Guide
CIDR, subnet masks, and host ranges made simple.
Guide
From query to response in plain language.
Guide
What your public IP reveals, and why private ranges stay hidden.
The tools and services we actually use
Beyond the free utilities, we keep a short, honest list of the hosting, VPNs, and privacy services we trust — each backed by a guide that shows you how to verify it yourself.
See our recommended resources