IP Address Converter
IPv4, IPv6, Decimal, Hex And Binary

What An IP Address Converter Does For You

An IP address is just a number. People write it in many ways. For example, logs show a long decimal. A firewall wants dotted binary. Also, a config file wants hex.

An ip address converter moves between them. First, type an address in any form. Then the tool shows every other form at once. So you copy the one you need.

Also, it handles IPv6. It shortens and expands addresses, and it builds the reverse DNS name. So you can check a long address in a blink.

Everything runs in your browser. So the addresses you check never leave your device.

How An IPv4 Address Is Really A Number

An IPv4 address has four parts, and each part is one byte. Put the four bytes together and you get a 32 bit number. So 192.168.1.1 is also 3232235777.

The maths is simple. First, multiply the first part by 16777216, the second by 65536, and the third by 256. Then add the last.

For more detail, see: RFC 4291, IPv6 addressing.

IPv4 To Decimal

Type any IPv4 address, and the table shows the decimal number. Also, some old tools and URLs use that form. For example, 8.8.8.8 is 134744072.

Decimal To IP

Paste a decimal number such as 3232235777, and the tool turns it into dotted form. Also, it accepts numbers up to 4294967295, which is the top of the IPv4 range.

IP To Hex And Binary

Hex shows the same 32 bits in eight digits, so 192.168.1.1 is 0xC0A80101. Dotted hex keeps the four parts, as in c0.a8.01.01.

Then binary shows each part as eight bits. So you can read a mask or a subnet by eye.

Dotted Octal

Some old tools write each part in octal. The tool does that with four digits, such as 0300.0250.0001.0001. So use it to see each part in base eight.

However, the tool reads every part you type as decimal. So 010.0.0.1 means 10.0.0.1.

IPv6 Short And Full Forms

An IPv6 address has eight groups of four hex digits. The short form drops leading zeros in each group and replaces the longest run of zero groups with two colons. Then the full form writes everything out.

So 2001:db8::1 is the same address as 2001:0db8:0000:0000:0000:0000:0000:0001.

IPv6 To Decimal

An IPv6 address is a 128 bit number. So the tool shows it in decimal, hex and binary, and you can compare or sort addresses by value.

IPv4 Mapped IPv6 And 6to4

Every IPv4 address has an IPv6 twin that starts with ::ffff:. First, the tool shows it, and it shows the 6to4 prefix too.

Also, when you type a mapped IPv6 address, the tool shows the IPv4 address inside it.

Reverse DNS Names

A reverse lookup uses a special name. For IPv4, reverse the four parts and add in-addr.arpa. For IPv6, reverse the 32 hex digits, put a dot between them, and add ip6.arpa.

So the tool builds both for you.

Address Type And Class

Also, the tool tells you whether an address is private, loopback, link local, shared, documentation, multicast or public. For IPv4 it also shows the old class, from A to E.

So you know at once if an address can show up on the open internet.

Convert A List

Switch to A list of addresses. Paste one address per line and pick the form you want. Then the tool converts every line.

Also, a line that does not fit gets a question mark in front, so you can find it.

Accepted Formats

First, for IPv4, the tool reads dotted decimal, a plain decimal number, 0x hex, 0b binary, 0o octal and dotted binary. For IPv6, it reads full and short forms, an IPv4 tail, square brackets and a zone name after a percent sign.

Common Uses

Admins use it to read logs, write firewall rules and check blocklists. Developers use it to store addresses as numbers in a database, which makes range checks fast.

Also, students use it to learn how addressing works.

Safe By Design

First, the tool works in your browser. It sends nothing, and it stores nothing. So your addresses stay yours.