404 / ROUTE NOT FOUND
This route reaches a dead end.
The toolbox has plenty of better destinations.
Back to the tools →YOUR EVERYDAY NETWORK WORKBENCH
Less guesswork.
More answers.
IP addresses, subnets and DNS. A few good tools, ready when you are.
YOUR PUBLIC IPv4
216.73.216.79ADDRESSING / 01Runs in your browser
Subnet calculator
Turn a CIDR prefix into a network, address range and exact address count.
A LITTLE CONTEXT GOES A LONG WAY
Notes from the field.
01 / ADDRESSINGCIDR, without
Why two resolvers
A longer address.
CIDR, without
the guesswork.
Prefixes, address counts and what “usable” really means.
02 / DNSWhy two resolvers
can disagree.
Caches and TTLs. Different answers are not always wrong answers.
03 / IPV6A longer address.
A simpler explanation.
Get comfortable with zero compression, prefixes and address scopes.
PREFER A TERMINAL?
Just the IP. Nothing else.
curl -fsS https://iptoolbox.infoCLI & JSON docs ↗