This page is an index of the STANAG 5066 SIS Application Protocol (S5066-APP) series. The complete set of documents in this series are listed in the index below.

1. S5066-APP Series Goals

STANAG 5066 is a NATO Standard “PROFILE FOR HF RADIO DATA COMMUNICATIONS” providing a link level service for HF Radio. The latest version is Edition 3 of December 2010.

The S5066-APP series of documents sets out protocol specifications that operate over STANAG 5066 and communicate with STANAG 5066 servers using the SIS protocol. These protocols provide value add to the core STANAG 5066 service.

Isode is managing the S5066-APP series and this index as a community service. The initial S5066-APP documents are written by Isode. Isode encourages other individuals, organizations and vendors to contribute documents to this series.

2. Exchange of Information on STANAG 5066 APPs

The STANAG 5066 APP specifications are all published on this website and can be reached using the links in the table at the bottom of this document.

There is an open mailing list s5066-ep (at) for discussion of current and new S5066-EPs and S5066-APP specifications. Subscription information on the website.

3. Document Requirements

S5066-APP specifications must be openly available specifications that NATO may incorporate into a future edition of STANAG 5066 or supporting standard. They must be free of IPR or Patent restrictions that would prevent this.

These specifications are intended for implementation and must provide sufficient clear information to be implemented in context of STANAG 5066 Ed3.

S5066-APPs must have a clear publication date, and (apart from this document) a referenceable version number.

S5066-APPs must have a status value which is one of:

  • Experimental: A new proposal for consideration.
  • Implemented: A specification that has at least one implementation that has demonstrated viability of the proposal.
  • Interoperable: A specification with two independent implementations that have been shown to inter-operate.   
  • Informational: A document that does not have interoperability considerations.

4. Index

Number Title Status Last Edit Date Summary Download
S5066‑APP1 STANAG 5066 Application Protocol Index Informational 19‑12‑2017 This page. N/A
S5066‑APP2 HF Discovery, Ping and Traffic Load Experimental 22‑12‑2017 This document defines a protocol operating over STANAG 5066 SIS to provide three services to facilitate operation and analysis of STANAG 5066 networks. Download Paper
S5066‑APP3 SIS Layer Extension Protocol (SLEP) Experimental 24‑08‑2020 This document specifies a layer protocol that can be used over SIS to provide a number of core services that can be used by different applications. This protocol is designed as a replacement for RCOP and UDOP. It also provides compression and a new stream service. Download Paper
S5066‑APP4 Providing STANAG Services over UDP Experimental 22‑12‑20218 This protocol specifies an approach of providing the STANAG 5066 service over IP, with an alternate option to work over UDP. Download Paper
S5066‑APP5 Implicit IP Client over STANAG 5066 Experimental 3‑10‑2019 This protocol specifies a mechanism for optimized transfer of IPv4 or IPv6 over STANAG 5066. Download Paper
S5066‑APP6 Providing Control Parameters for STANAG 5066 Experimental 11‑12‑2019 This specification defines a control mechanism to communicate key parameters to a black side STANAG 5066 server in conjunction with use of IP Crypto and “Providing STANAG 5066 services over UDP” (S5066-APP7). Download Paper
S5066‑APP7 XML Control Messages for STANAG 5066 Experimental 20‑12‑2021 This specification defines data formats to communicate control information from a black side STANAG 5066 server in conjunction with use of IP Crypto and “Providing STANAG 5066 services over UDP/IP” (S5066-APP4). Download Paper
S5066‑APP8 HF File Transfer Protocol (HFFTP) Experimental 28‑08‑2020 This protocol specifies a simple file transfer protocol operating over SIS Layer Extension Protocol (SLEP) Streaming Service, specified in S5066-APP3. Download Paper
S5066‑APP9 HF-PEP: STANAG 5066 TCP Performance Enhancing Proxy Protocol Experimental 30‑06‑2020 This document specifies a protocol operating over STANAG 5066 to support TCP PEP (Performance Enhancing Proxy) based operation, to enable efficient operation of TCP based protocols over HF. Download Paper
S5066‑APP10 HF Location & Information Sharing Protocol Experimental 25‑04‑2022 This protocol defines the HF Location and Information Sharing Protocol (HF-LISP), which a protocol operating over STANAG 5066 to provide location and other information about an HF node. Download Paper
S5066‑APP11 HF Broadcast Protocol (HFBP) Experimental 10‑08‑2018 This document specifies “HF Broadcast Protocol” (HFBP), a protocol to support broadcast operation over STANAG 5066, supporting both EMCON and non-EMCON use. Download Paper
S5066‑APP12 HF Routing Information Protocol (HF-RIP) Experimental 05‑07‑2023 This protocol specifies an IP routing protocol for use with HF Networks. It is a distance vector protocol modelled on the well known RIP protocol family. Download Paper