| Main | 
| Number 
 | Title | Status | Questions | 
| P.617-6 (09/2025) 
 | Propagation prediction techniques and data required for the design of trans-horizon radio-relay systems | In force (Main) 
 | N/A | 
| 
 | 
| Previous versions | 
| Number 
 | Title | Status | Questions | 
| P.617-3 (09/2013) 
 | Propagation prediction techniques and data required for the design of trans-horizon radio-relay systems | Superseded 
 | 205/3 | 
| P.617-5 (08/2019) 
 | Propagation prediction techniques and data required for the design of trans-horizon radio-relay systems | In force 
 | 205/3 | 
| P.617-2 (02/2012) 
 | Propagation prediction techniques and data required for the design of trans-horizon radio-relay systems Note - Climatic zone classification map for Recommendation ITU-R P.617-2 provided in the zip file
 | Superseded 
 | 205/3 | 
| P.617-1 (03/92) 
 | Propagation prediction techniques and data required for the design of trans-horizon radio-relay systems | Superseded 
 | N/A | 
| P.617-4 (12/2017) 
 | Propagation prediction techniques and data required for the design of trans-horizon radio-relay systems | Superseded 
 | 205/3 |