BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
240e:1a::/35
Announced exactly
- 240e:1a::/35AS23650AS Number for CHINANET jiangsu province backboneRPKI Valid240e:1a::
- Registry
- APNIC · China · May 20, 2010
- Delegated block
- 240e:: – 240e:ff:ffff:ffff:ffff:ffff:ffff:ffff
Covering routes
More-specific routes
- 240e:1a:10::/44AS137702Nanjing, Jiangsu Province, P.R.China.RPKI Valid240e:1a:10::
- 240e:1a:30::/44AS138950Jiangsu Wuxi International IDC networkRPKI Valid240e:1a:30::
- 240e:1a:40::/44AS137702Nanjing, Jiangsu Province, P.R.China.RPKI Valid240e:1a:40::
- 240e:1a:50::/44AS140292CHINATELECOM Jiangsu province Suzhou 5G networkRPKI Valid240e:1a:50::
- 240e:1a:70::/44AS131325CHINATELECOM JIANGSU province NANTONG MAN networkRPKI Valid240e:1a:70::
- 240e:1a:110::/44AS134769ChinaNet Jiangsu Changzhou Liyang IDC networkRPKI Valid240e:1a:110::
- 240e:1a:120::/44AS134756CHINANET Nanjing Jishan IDC networkRPKI Valid240e:1a:120::
- 240e:1a:140::/44AS140293CHINATELECOM Jiangsu province Changzhou 5G networkRPKI Valid240e:1a:140::
- 240e:1a:150::/44AS134770CHINANET Jiangsu province Suzhou taihu IDC networkRPKI Valid240e:1a:150::
- 240e:1a:160::/44AS146966China TelecomRPKI Valid240e:1a:160::
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.