167.21.152.0/21 Microsoft Corporation
Announced by AS8075 Microsoft Corporation. RPKI valid Seen by 5 of our 5 looking glass sessions.
Summary
What the table says about 167.21.152.0/21
Prefix
Origin
AS8075 MICROSOFT-CORP-MSN-AS-BLOCK
RPKI
RPKI valid
Size
2,048 addresses
Less specific
More specifics
0
IRR route objects
1 exact, 3 covering
In RouteViews
2026-10-12 12:02 UTC
Paths
How 167.21.152.0/21 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 13760 8075
| Origin | AS8075 Microsoft Corporation |
| Origin code | IGP |
| Communities | 13760:3002 36601:150 36601:2001 36601:13760 |
| Updated | 4d 11h ago |
AS903 UNIFIED-COMMUNICATIONS-TECHNOLOGIES (UCT - Valdosta, GA)Collector-2-COCOA-FL903 13760 8075
| Origin | AS8075 Microsoft Corporation |
| Origin code | IGP |
| Communities | 903:900 903:13760 |
| Updated | 4d 19h ago |
AS36295 FLORIDA-HIGH-SPEED-INTERNET (FLHSI - Cocoa, FL)Collector-2-COCOA-FL36295 6939 8075
| Origin | AS8075 Microsoft Corporation |
| Origin code | IGP |
| Communities | 36295:100 |
| Updated | 4d 19h ago |
RPKI
Route origin authorizations
Covered by a ROA authorizing AS8075 to originate 167.21.152.0/21 up to /24. Validate another origin.
| ROA prefix | Max length | Authorized origin | Trust anchor |
|---|---|---|---|
| 167.21.152.0/21 | /24 | AS8075 MICROSOFT-CORP-MSN-AS-BLOCK | 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 |
|---|---|---|---|---|
| 167.21.152.0/21 | AS8075 MICROSOFT-CORP-MSN-AS-BLOCK | RADB | Microsoft ByoIp | MAINT-AS8075 |
| 167.21.128.0/17 covering | AS30641 STATEOFDE | RADB | State of Delaware | MAINT-AS30641 |
| 167.21.0.0/16 covering | AS34 UDELNET | RADB | Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 | MAINT-AS7922 |
| 167.21.0.0/16 covering | AS30641 STATEOFDE | RADB | State of Delaware | MAINT-AS30641 |
Less specific
Covering prefixes
Announced prefixes that contain this one, most specific first.