Service Registration Protocol for DNS-Based Service Discovery

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Authors Stuart Cheshire  , Ted Lemon 
Last updated 2018-01-04 (latest revision 2017-07-03)
Replaced by draft-ietf-dnssd-srp
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The DNS-SD Service Registration Protocol provides a way to perform DNS-Based Service Discovery using only unicast packets. This eliminates the dependency on Multicast DNS as the foundation layer, which has worked well in some environments, like the simplest of home networks, but not in others, like large enterprise networks (where multicast does not scale well to thousands of devices) and mesh networks (where multicast and broadcast are supported poorly, if at all). Broadly speaking, the DNS-SD Service Registration Protocol is DNS Update, with a few additions.


Stuart Cheshire (
Ted Lemon (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)