BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
118.32.0.0/12
Announced exactly
- 118.32.0.0/12AS4766Korea TelecomRPKI Not found118.32.0.0
- Registry
- APNIC · South Korea · Aug 3, 2007
- Delegated block
- 118.32.0.0 – 118.63.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 118.32.0.0/13AS4766Korea TelecomRPKI Not found118.32.0.0
- 118.32.40.0/24AS38392KYONGGI YANGPYEONG OFFICE OF EDUCATIONRPKI Not found118.32.40.0
- 118.35.186.0/24AS38671S-OIL Corp., LtdRPKI Not found118.35.186.0
- 118.36.75.0/24AS38414Gyeonggi siheung office of educationRPKI Not found118.36.75.0
- 118.36.200.0/23AS4766Korea TelecomRPKI Not found118.36.200.0
- 118.37.63.0/24AS9526KOSCOMRPKI Not found118.37.63.0
- 118.40.0.0/13AS4766Korea TelecomRPKI Not found118.40.0.0
- 118.40.167.0/24AS4766Korea TelecomRPKI Not found118.40.167.0
- 118.46.128.0/18AS4766Korea TelecomRPKI Not found118.46.128.0
- 118.46.183.0/24AS4766Korea TelecomRPKI Not found118.46.183.0
- 118.47.74.0/24AS4793Hyundai Heavy IndustriesRPKI Not found118.47.74.0
- 118.47.74.0/25AS4793Hyundai Heavy IndustriesRPKI Not found118.47.74.0
- 118.47.74.128/25AS4793Hyundai Heavy IndustriesRPKI Not found118.47.74.128
On the internet, routes are announced as prefixes: an autonomous system tells its neighbours via BGP that it can deliver traffic for, say, 49.224.0.0/14. 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.