Duration Converter
Convert a duration between seconds, ISO 8601, clock time and words.
IP to Binary Converter
See an IP address in binary, hex and decimal, octet by octet.
Quick Tool Overview
The IP to Binary Converter shows an address octet by octet in binary, hexadecimal and decimal, with its 32-bit integer value — which is what makes subnet masks stop being something to memorise.
- What it does
- Converts an IPv4 address between every numeric base
- You give it
- An address, optionally with a prefix
- You get back
- Binary, hex, decimal and the 32-bit integer
- Best for
- Understanding subnetting and storing addresses
About the IP to Binary Converter
An IP address is a 32-bit number written as four decimal octets, and almost everything confusing about subnetting becomes obvious once you see the binary. This shows each octet in binary, hexadecimal and decimal, plus the whole address as one 32-bit integer.
Put a subnet mask alongside and the point of a prefix length becomes visual: the mask is a run of ones followed by a run of zeros, the ones select the network part and the zeros select the host part, and the boundary between them is the slash number. The 32-bit integer form is worth knowing too — it is how addresses are stored in a database column and compared in a range query.
Key features of the IP to Binary Converter
Octet by octet
Each of the four in every base, so the relationship between the dotted form and the underlying bits is visible.
Network and host bits split
Add a mask and the binary is divided at the prefix boundary, which is where subnetting finally makes sense.
The 32-bit integer
How an address is stored in a database column and compared in a range query, where the dotted form cannot be.
Signed values explained
Why some languages report a negative number, and what to add to get the unsigned value.
Copy any form
Click a value to take it, in whichever base you need it.
How to use the IP to Binary Converter
-
1
Enter an address
Any IPv4 address, with or without a prefix.
-
2
Read the octets
Each one in binary, hex and decimal, side by side.
-
3
Add a mask
The network and host bits are then highlighted separately.
-
4
Take the integer
The 32-bit value, which is how addresses are stored and compared.
Frequently asked questions
Because IPv4 defines it that way: four octets of eight bits. That gives about 4.3 billion addresses, which is why we ran out and why IPv6 uses 128 bits.
Where the network part ends and the host part begins. A /26 mask is 26 ones then 6 zeros, and seeing that makes the subnet arithmetic obvious rather than memorised.
Storing and comparing. An address as a single integer sorts correctly and makes a range query a simple BETWEEN, which the dotted form does not.
Because it read the 32 bits as signed, so anything above 127 in the first octet comes out negative. Add 4,294,967,296 to get the unsigned value.
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