121.203.72.0/21 SmarTone Mobile Communications Ltd
Announced by AS17924 SmarTone Mobile Communications Ltd. RPKI valid Seen by 3 of our 5 looking glass sessions.
Summary
What the table says about 121.203.72.0/21
Prefix
Origin
AS17924 SMARTONE-MB-AS-AP
RPKI
RPKI valid
Size
2,048 addresses
Less specific
More specifics
0
IRR route objects
3 exact, 6 covering
In RouteViews
2026-10-13 12:02 UTC
Paths
How 121.203.72.0/21 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.
AS903 UNIFIED-COMMUNICATIONS-TECHNOLOGIES (UCT - Valdosta, GA)Collector-2-COCOA-FL903 36295 6939 17924
| Origin | AS17924 SmarTone Mobile Communications Ltd |
| Origin code | IGP |
| Communities | 903:100 903:900 |
| Updated | 5d 20h ago |
RPKI
Route origin authorizations
Covered by a ROA authorizing AS17924 to originate 121.203.72.0/21 up to /21. Validate another origin.
| ROA prefix | Max length | Authorized origin | Trust anchor |
|---|---|---|---|
| 121.203.72.0/21 | /21 | AS17924 SMARTONE-MB-AS-AP | APNIC |
| 121.203.64.0/18 | /18 | AS17924 SMARTONE-MB-AS-AP | APNIC |
| 121.202.0.0/15 | /15 | AS17924 SMARTONE-MB-AS-AP | APNIC |
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 |
|---|---|---|---|---|
| 121.203.72.0/21 | AS17924 SMARTONE-MB-AS-AP | APNIC | Smartone Mobile communications Limited 31 / F , Millennium City 2 378 Kwun Tong Road, Kwun Tong, Kowloon | MAINT-HK-SMARTM-AP |
| 121.203.72.0/21 | AS17924 SMARTONE-MB-AS-AP | NTTCOM | Proxy-registered route object | MAINT-AS9304 |
| 121.203.72.0/21 | AS17924 SMARTONE-MB-AS-AP | RADB | smartone | MAINT-AS17924 |
| 121.203.64.0/18 covering | AS17924 SMARTONE-MB-AS-AP | APNIC | Smartone Mobile communications Limited 31 / F , Millennium City 2 378 Kwun Tong Road, Kwun Tong, Kowloon | MAINT-HK-SMARTM-AP |
| 121.203.64.0/18 covering | AS17924 SMARTONE-MB-AS-AP | NTTCOM | Proxy-registered route object | MAINT-AS9304 |
| 121.203.64.0/18 covering | AS17924 SMARTONE-MB-AS-AP | RADB | smartone | MAINT-AS17924 |
| 121.202.0.0/15 covering | AS17924 SMARTONE-MB-AS-AP | APNIC | Smartone Mobile communications Limited 31 / F , Millennium City 2 378 Kwun Tong Road, Kwun Tong, Kowloon | MAINT-HK-SMARTM-AP |
| 121.202.0.0/15 covering | AS17924 SMARTONE-MB-AS-AP | NTTCOM | Proxy-registered route object | MAINT-AS9304 |
| 121.202.0.0/15 covering | AS17924 SMARTONE-MB-AS-AP | RADB | SmarTone | MAINT-AS17924 |
Less specific
Covering prefixes
Announced prefixes that contain this one, most specific first.