| URN Namespace | Template | Reference |
| 3gpp | [RFC5279] | |
| adid | [RFC8107] | |
| alert | [RFC7462] | |
| bbf | [RFC8057] | |
| broadband-forum-org | [RFC8057] | |
| cablelabs | [RFC6289] | |
| ccsds | [RFC7738] | |
| cgi | [RFC5138] | |
| clei | [RFC4152] | |
| dgiwg | [RFC6288] | |
| dslforum-org | [RFC8057] | |
| dvb | [RFC5328][RFC7354] | |
| ebu | [RFC5174] | |
| eidr | [RFC7972] | |
| epc | [RFC5134] | |
| epcglobal | [RFC5134] | |
| eurosystem | [RFC7207] | |
| example | [RFC6963] | |
| fdc | [RFC4198] | |
| fipa | [RFC3616] | |
| geant | [RFC4926] | |
| globus | [RFC7853] | |
| gsma | [RFC7254] | |
| hbbtv | [RFC7528] | |
| ieee | [RFC8069] | |
| ietf | [RFC2648] | |
| iptc | [RFC3937] | |
| isan | [RFC4246] | |
| isbn | [isbn-template] | [International ISBN Agency] |
| iso | [RFC5141] | |
| issn | [issn-template] | [ISSN International Centre] |
| ivis | [RFC4617] | |
| liberty | [RFC3622] | |
| mace | [RFC3613] | |
| mef | [RFC7818] | |
| mpeg | [RFC3614] | |
| nato | [RFC7467] | |
| nbn | [RFC3188] | |
| nena | [RFC6061] | |
| newsml | [RFC3085] | |
| nfc | [RFC4729] | |
| nzl | [RFC4350] | |
| oasis | [RFC3121] | |
| ogc | [RFC5165] | |
| ogf | [RFC6453] | |
| oid | [RFC3061] | |
| oipf | [RFC6893] | |
| oma | [RFC4358] | |
| pin | [RFC3043] | |
| publicid | [RFC3151] | |
| s1000d | [RFC4688] | |
| schac | [RFC6338] | |
| service | [RFC5031] | |
| smpte | [RFC5119] | |
| swift | [RFC3615] | |
| tva | [RFC4195] | |
| uci | [RFC4179] | |
| ucode | [RFC6588][RFC Errata 3188][RFC Errata 3189] | |
| uuid | [RFC4122] | |
| web3d | [RFC3541] | |
| xmlorg | [RFC3120] | |
| xmpp | [RFC4854] |
