Network tools and guides that just work.
NetworkCheckr gives you free, browser-based utilities for checking IPs, looking up DNS records, calculating subnets, and understanding how networks work. No signups, no installs, no nonsense — just open and use.
$myip
ispresolving…
locationresolving…
timezoneresolving…
checking link…
Your public IP, location, and ISP — instantly, no signup required.
Popular tools and guides
Tool
MAC Address Lookup
Find the vendor behind any MAC address.
Tool
Subnet Calculator
Network range, broadcast, and usable hosts from any CIDR.
Tool
DNS Lookup
Query A, AAAA, MX, TXT, and CNAME records for any domain.
Guide
What is a MAC address?
OUI vendors, randomization, and how to find yours.
Guide
Subnetting for beginners
CIDR, subnet masks, and host ranges made simple.
Guide
How DNS actually works
From query to response in plain language.