5.81.0.0/16 British Telecommunications Limited
Announced by AS2856 British Telecommunications Limited. RPKI valid Seen by 5 of our 5 looking glass sessions.
Summary
What the table says about 5.81.0.0/16
Prefix
Origin
AS2856 BT-UK-AS
RPKI
RPKI valid
Size
65,536 addresses
Less specific
More specifics
0
IRR route objects
1 exact, 1 covering
In RouteViews
2026-10-13 16:03 UTC
Paths
How 5.81.0.0/16 is reached
Every path our looking glass collectors hold for this exact prefix. Open one for its attributes, or see them all side by side in the looking glass.
AS36601 TNT (TNT - Tampa, FL)Collector-1-TAMPA-FL36601 174 5400 2856
| Origin | AS2856 British Telecommunications Limited |
| Origin code | IGP |
| Communities | 174:21000 174:22013 36601:150 36601:174 36601:2001 |
| Updated | 5d 14h ago |
AS903 UNIFIED-COMMUNICATIONS-TECHNOLOGIES (UCT - Valdosta, GA)Collector-2-COCOA-FL903 13760 3356 5400 2856
| Origin | AS2856 British Telecommunications Limited |
| Origin code | IGP |
| Communities | 903:900 903:13760 |
| Updated | 5d 22h ago |
AS36295 FLORIDA-HIGH-SPEED-INTERNET (FLHSI - Cocoa, FL)Collector-2-COCOA-FL36295 6461 2856
| Origin | AS2856 British Telecommunications Limited |
| Origin code | IGP |
| Communities | 6461:5997 36295:100 36295:6461 |
| Updated | 4h 26m ago |
RPKI
Route origin authorizations
Covered by a ROA authorizing AS2856 to originate 5.81.0.0/16 up to /16. Validate another origin.
| ROA prefix | Max length | Authorized origin | Trust anchor |
|---|---|---|---|
| 5.81.0.0/16 | /16 | AS2856 BT-UK-AS | RIPE |
| 5.80.0.0/15 | /15 | AS2856 BT-UK-AS | RIPE |
IRR
Route objects
Registered in the IRR for this prefix and the ones covering it. Look it up live.
| Route | Origin | Source | Description | Maintained by |
|---|---|---|---|---|
| 5.81.0.0/16 | AS2856 BT-UK-AS | RIPE | BT Public Internet Service | BTNET-INFRA-MNT |
| 5.80.0.0/15 covering | AS2856 BT-UK-AS | RIPE | BT Public Internet Service | BTNET-INFRA-MNT |
Less specific
Covering prefixes
Announced prefixes that contain this one, most specific first.