DICOM PS3.15 2017d - Security and System Management Profiles

H.2.3 Referenced Standards

RFC2136 DNS Dynamic Updates http://tools.ietf.org/html/rfc2136

RFC2181 Clarifications to the DNS Specification http://tools.ietf.org/html/rfc2181

RFC2219 Use of DNS Aliases for Network Services http://tools.ietf.org/html/rfc2219

RFC2782 A DNS RR for specifying the location of services (DNS SRV) http://tools.ietf.org/html/rfc2782

RFC6762 Multicast DNS http://tools.ietf.org/html/rfc6762

RFC6763 DNS-Based Service Discovery http://tools.ietf.org/html/rfc6763

DNS Self-Discovery http://www.dns-sd.org/

The name to be used in the DNS SRV to advertise DICOM Association Acceptors, regardless of the SOP Class(es) supported, shall be


These choices are consistent with the names registered with IANA to define the mapping of IP ports to services, which is conventional for this usage. The choice "dicom" is used rather than the "acr-nema" alternative for clarity. There is no implied port choice by the usage in the DNS SRV Service Type, since the port is explicitly conveyed.

The DNS TXT record may contain the following parameters:

In the absence of a DNS TXT record, or the AET parameter of the DNS TXT record, then the Instance Name preceding the Service Type in the DNS SRV record used for DICOM service discovery shall be the AET.


Further parameters are not specified, for example to indicate the SOP Classes supported or other information, since the size of DNS records encoded as UDP datagrams is strictly limited, and furthermore, the envisaged multicast usage encourages the exchange of the minimal information necessary. The existing DICOM association negotiation mechanism can be used to explore the SOP Classes offered once the IP address, port number and AET are known. The primary device type is supplied because it is useful to indicate to users the type of device, which is not conveyed during association establishment.

DICOM PS3.15 2017d - Security and System Management Profiles