209.183.40.0/23 AT&T Enterprises, LLC
Announced by AS20057 AT&T Enterprises, LLC. RPKI valid Seen by 5 of our 5 looking glass sessions.
Summary
What the table says about 209.183.40.0/23
Prefix
Origin
AS20057 ATT-MOBILITY-LLC-AS20057
RPKI
RPKI valid
Size
512 addresses
Less specific
More specifics
0
IRR route objects
1 exact, 1 covering
In RouteViews
2026-10-12 20:02 UTC
Paths
How 209.183.40.0/23 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 7018 20057
| Origin | AS20057 AT&T Enterprises, LLC |
| Origin code | IGP |
| Communities | 174:21000 174:22013 36601:150 36601:174 36601:2001 |
| Updated | 4d 19h ago |
AS903 UNIFIED-COMMUNICATIONS-TECHNOLOGIES (UCT - Valdosta, GA)Collector-2-COCOA-FL903 13760 3356 7018 20057
| Origin | AS20057 AT&T Enterprises, LLC |
| Origin code | IGP |
| Communities | 903:900 903:13760 |
| Updated | 5d 3h ago |
AS36295 FLORIDA-HIGH-SPEED-INTERNET (FLHSI - Cocoa, FL)Collector-2-COCOA-FL36295 6939 7018 20057
| Origin | AS20057 AT&T Enterprises, LLC |
| Origin code | IGP |
| Communities | 36295:100 |
| Updated | 5d 3h ago |
RPKI
Route origin authorizations
Covered by a ROA authorizing AS20057 to originate 209.183.40.0/23 up to /23. Validate another origin.
| ROA prefix | Max length | Authorized origin | Trust anchor |
|---|---|---|---|
| 209.183.40.0/23 | /23 | AS20057 ATT-MOBILITY-LLC-AS20057 | ARIN |
| 209.183.32.0/19 | /19 | AS7018 ATT-INTERNET4 | ARIN |
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 |
|---|---|---|---|---|
| 209.183.40.0/23 | AS20057 ATT-MOBILITY-LLC-AS20057 | ARIN | AT&T Enterprises, LLC | MNT-AEL-360 |
| 209.183.32.0/19 covering | AS7018 ATT-INTERNET4 | ARIN | AT&T Enterprises, LLC | MNT-AEL-360 |
Less specific
Covering prefixes
Announced prefixes that contain this one, most specific first.