123.255.64.0/21 The Chinese University of Hong Kong
Announced by AS3661 The Chinese University of Hong Kong. RPKI not found Seen by 5 of our 5 looking glass sessions.
Summary
What the table says about 123.255.64.0/21
Prefix
Origin
AS3661 ERX-CUHKNET
RPKI
RPKI not found
Size
2,048 addresses
Less specific
none
More specifics
0
IRR route objects
6 exact, 4 covering
In RouteViews
2026-10-14 12:02 UTC
Paths
How 123.255.64.0/21 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 174 3491 17824 3662 3661
| Origin | AS3661 The Chinese University of Hong Kong |
| Origin code | IGP |
| Communities | 174:21000 174:22013 36601:150 36601:174 36601:2001 |
| Updated | 6d 11h ago |
AS903 UNIFIED-COMMUNICATIONS-TECHNOLOGIES (UCT - Valdosta, GA)Collector-2-COCOA-FL903 13760 3356 3491 17824 3662 3661
| Origin | AS3661 The Chinese University of Hong Kong |
| Origin code | IGP |
| Communities | 903:900 903:13760 |
| Updated | 6d 19h ago |
AS36295 FLORIDA-HIGH-SPEED-INTERNET (FLHSI - Cocoa, FL)Collector-2-COCOA-FL36295 6939 3661
| Origin | AS3661 The Chinese University of Hong Kong |
| Origin code | IGP |
| Communities | 36295:100 |
| Updated | 6d 19h ago |
RPKI
Route origin authorizations
No ROA covers this prefix, so RPKI has nothing to say about who may originate it. Validate another origin.
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 |
|---|---|---|---|---|
| 123.255.64.0/21 | AS3661 ERX-CUHKNET | APNIC | The Chinese University of Hong Kong | MAINT-CUHKNET-HK |
| 123.255.64.0/21 | AS9269 HKBN-AS-AP | NTTCOM | HKBN as object (AS9269) | MAINT-HKBN |
| 123.255.64.0/21 | AS3661 ERX-CUHKNET | RADB | HKBN(customer route) | MAINT-AS9269 |
| 123.255.64.0/21 | AS3662 HARNET | RADB | HKBN(customer route) | MAINT-AS9269 |
| 123.255.64.0/21 | AS9269 HKBN-AS-AP | RADB | HKBN(customer route) | MAINT-AS9269 |
| 123.255.64.0/21 | AS10103 HKBN-AS-AP | RADB | HKBN(customer route) | MAINT-AS9269 |
| 123.255.64.0/20 covering | AS3661 ERX-CUHKNET | APNIC | The Chinese University of Hong Kong | MAINT-CUHKNET-HK |
| 123.255.64.0/20 covering | AS3661 ERX-CUHKNET | NTTCOM | CMI IP Transit | MAINT-CMI-INT-HK |
| 123.255.64.0/20 covering | AS3661 ERX-CUHKNET | RADB | Nexusguard (Customer Route) | MAINT-AS45474 |
| 123.255.64.0/19 covering | AS3661 ERX-CUHKNET | RADB | PACNET (proxy-registered route object) | MAINT-AS4637 |