IPv4 Address Converter

Paste the address — decimal, hex, or integer — and every other format fills in at once

Most of the time you're going between dotted-decimal and integer, usually because you're storing IPs in a database and the numeric form is faster to index. The converter handles that, but it also shows six other representations at the same time — binary with dots, compact binary, hexadecimal, octal, reverse-DNS pointer, and URL-encoded form. You don't have to decide which output you want before you start. Type 192.168.1.1 and all of them appear together, so you can grab whichever one your script or config actually needs. Batch input accepts a list of addresses, one per line, and runs the same conversion across all of them at once.

The address analysis section is more useful than it looks at first

Below the conversion output there's a panel that tells you the network class and whether the address is private, loopback, link-local, multicast, or reserved. For most addresses you already know that, so you'll scroll past it. But when you're auditing an unfamiliar network or checking an address someone handed you, having it flagged immediately saves a lookup. Add a CIDR prefix like /26 and it also calculates the network address, broadcast, subnet mask, wildcard, and the full usable host range — which is what you actually need when you're setting up a DHCP pool or writing a firewall rule.