# Point code

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Identifier for routing telephony signals

Not to be confused with [Code point](/source/Code_point).

An [SS7](/source/Signalling_System_No._7) **point code** is an address for the SS7 telephone switching system. It is similar to an [IP address](/source/IP_address) in an IP network. It is a unique address for a node (Signaling Point, or SP), used in [MTP layer 3](/source/Message_Transfer_Part) to identify the destination of a message signal unit (MSU).

Message contain an OPC (Originating Point Code) and a DPC (Destination Point Code); sometimes documents refer to it as a signaling point code. Depending on the network, a point code can be 24 bits (North America, China), 16 bits (Japan), or 14 bits (ITU standard, International SS7 network and most countries) in length.

[ANSI](/source/ANSI) point codes use 24 bits, mostly in 8-8-8 format.[1] [ITU](/source/ITU) point codes use 14 bits in 3-8-3 format.[2]

Fourteen bit point codes can be written in multiple formats. The most common are decimal number, hexadecimal number, or 3-8-3 format (3 most significant bits, 8 middle bits, 3 least significant bits).

Twenty-four bit point codes may be written in decimal, hexadecimal, or 8-8-8 format.

## Abbreviations

- OPC Originating Point Code

- DPC Destination Point Code

- ISPC International Signaling Point Code[2]

## References

1. **[^](#cite_ref-1)** ANSI T1.111.4/2000, Message Transfer Part.

1. ^ [***a***](#cite_ref-:0_2-0) [***b***](#cite_ref-:0_2-1) [ITU-T Recommendation Q.704](https://www.itu.int/rec/T-REC-Q.704/en/), Message Transfer Part.

## External links

- [Web-based PointCode converter](https://jhartman.pl/pc/)

- [SS7 Point Code Converter by Valid8.com](https://tools.valid8.com/#ss7)

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Adapted from the Wikipedia article [Point code](https://en.wikipedia.org/wiki/Point_code) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Point_code?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.