# What is ENUM (E.164 Number Mapping)?

> ENUM (E.164 Number Mapping, RFC 6116) is an IETF standard that maps an E.164 phone number to internet resources — SIP URIs, email, web — by encoding the number as a domain name and looking it up in DNS. It lets carriers and enterprises route calls and messages to IP endpoints straight from a phone number, and underpins number portability and VoIP interconnect. See /answers/what-is-e164, /answers/what-is-mnp, and /answers/programmable-voice.

- Canonical URL: https://www.broadnet.me/answers/what-is-enum
- Language: en
- Last reviewed: 2026-07-22
- Publisher: BroadNet (https://www.broadnet.me)

## Related

- [All answers](https://www.broadnet.me/answers)
- [Glossary](https://www.broadnet.me/answers)
- [What is E.164?](https://www.broadnet.me/answers/what-is-e164)
- [What is MNP (Mobile Number Portability)?](https://www.broadnet.me/answers/what-is-mnp)
- [What is a DID (Direct Inward Dialing) number?](https://www.broadnet.me/answers/what-is-did)
- [How does programmable voice work?](https://www.broadnet.me/answers/programmable-voice)
- [HLR Lookup](https://www.broadnet.me/products/hlr-lookup)
- [Voice](https://www.broadnet.me/products/voice)