Phone to IP Converter

Phone to IP Address Converter

This playful converter turns a phone number into an IPv4 address and an IPv4 address into a phone number. Enter a number such as (123) 456-7890 and get 73.150.2.210; switch to IP to Phone and 73.150.2.210 becomes (123) 456-7890 again.

How the conversion works

There is no official link between phone numbers and IP addresses – the tool uses simple math. An IPv4 address is a 32-bit number between 0 and 4,294,967,295. The converter:

1. Removes everything except digits from the phone number: (123) 456-7890 → 1234567890.
2. Treats those digits as one decimal integer: 1,234,567,890.
3. Writes that integer as four bytes: 1,234,567,890 = 73 × 16,777,216 + 150 × 65,536 + 2 × 256 + 210 → 73.150.2.210.

The reverse direction converts the address to its integer value, pads it to ten digits, and formats it as a phone number. The result is fully reversible for all numbers up to 4,294,967,295.

What about larger phone numbers?

A ten-digit phone number can be as large as 9,999,999,999, which is more than twice the IPv4 range. Numbers above 4,294,967,295 – for example most US numbers with area codes above 429 – cannot be represented directly and are reported as errors. Turn on Wrap large numbers to use the remainder after dividing by 2³² (4,294,967,296) instead. The result is then still a valid IP address, but converting it back gives a different phone number.

A leading country code such as +1 is part of the digits, so +1 (415) 555-2671 is read as 14,155,552,671. Remove the country code if you want the ten-digit number only.

What is it good for?

• Puzzles, escape rooms, CTF challenges, and geocaching riddles that hide an IP address in a phone number (or the other way round).
• Teaching how IP addresses are just 32-bit integers in disguise.
• Creating memorable test addresses for documentation and demos.

Phone to IP does not locate a phone or reveal who owns an IP address. To see the integer value of an address directly, use Decimal to IP.