BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
123.140.0.0/14
Announced exactly
- 123.140.0.0/14AS3786LGDACOM LG DACOM CorporationRPKI Not found123.140.0.0
- Registry
- APNIC · South Korea · Feb 22, 2007
- Delegated block
- 123.140.0.0 – 123.143.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 123.140.39.0/24AS9699KFB-AS Standard CharteredRPKI Not found123.140.39.0
- 123.140.45.0/24AS9638NH-AS National Agricultural Cooperative federationRPKI Not found123.140.45.0
- 123.140.106.0/24AS9530SHINSEGAE-AS SHINSEGAE I C Co., Ltd.RPKI Not found123.140.106.0
- 123.140.109.0/24AS4790CHOSUN-AS-KR Chosun ilbo Inc.RPKI Not found123.140.109.0
- 123.140.121.0/24AS18338STARVAN-AS-KR DAOUDATARPKI Not found123.140.121.0
- 123.140.124.0/24AS138195MOACKCOLTD-AS-AP MOACK.Co.LTDRPKI Not found123.140.124.0
- 123.140.235.0/24AS152287HANWHALIFE-AS-KR HANWHALIFERPKI Not found123.140.235.0
- 123.140.237.0/24AS9843NACFFUTURES-AS NHINFORMATIONSYSTEMRPKI Not found123.140.237.0
- 123.140.241.0/24AS9638NH-AS National Agricultural Cooperative federationRPKI Not found123.140.241.0
- 123.141.73.0/24AS9526KOSCOM-AS-KR KOSCOMRPKI Not found123.141.73.0
- 123.141.115.0/25AS55613KAB-AS-KR KOREA APPRAISAL BOARDRPKI Not found123.141.115.0
- 123.141.141.0/24AS38707TOSSPAYMENTS-AS-KR TosspaymentsRPKI Not found123.141.141.0
- 123.141.247.0/24AS9776KBSTAR KOOKMIN BANKRPKI Not found123.141.247.0
On the internet, routes are announced as prefixes: an autonomous system tells its neighbours via BGP that it can deliver traffic for, say, 193.166.0.0/15. This tool looks a prefix up in our daily copy of the global routing table and shows three things:
- Exact announcements: which AS originates exactly this prefix. More than one origin (a MOAS) is normal for anycast services and some multihomed networks, and suspicious otherwise.
- Covering routes: less-specific announcements that contain it. Traffic follows the most specific route, so a covering route matters if the more-specific one disappears.
- More-specifics: announcements inside it, which may belong to other networks (customers, or a hijack).
Each announced route is also checked against the RPKI: whether a ROA authorises its origin AS.
The table is the view from APNIC’s route collector. Most of the global table is the same from everywhere, but a route that is filtered before it reaches that collector will not appear.
Frequently asked questions
Why is my /24 not listed but a /16 is?
Your addresses are announced as part of the larger block, and no one announces the /24 separately. That is the normal case for most customers of a provider.
What is a more-specific hijack?
Someone announces a longer prefix inside your space. Because routers prefer the most specific route, traffic goes to them. RPKI with a strict max length makes such announcements invalid.
Can I enter a single address?
Yes. The tool then shows the most specific announced route that contains it.