BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
Examples:
20.33.0.0/16
One collector's view (APNIC). A route filtered before it reaches that collector is not listed.
Announced exactly
- 20.33.0.0/16AS8075Microsoft CorporationRPKI Valid20.33.0.0
- Registry
- ARIN · United States · Oct 18, 2017
- Delegated block
- 20.33.0.0 – 20.33.255.255
Covering routes
0
No less-specific route covers it.
More-specific routes
221 more-specifics from 1 origin AS(es)
- 20.33.0.0/24AS8069Microsoft CorporationRPKI Valid20.33.0.0
- 20.33.1.0/24AS8069Microsoft CorporationRPKI Valid20.33.1.0
- 20.33.2.0/24AS8069Microsoft CorporationRPKI Valid20.33.2.0
- 20.33.3.0/24AS8069Microsoft CorporationRPKI Valid20.33.3.0
- 20.33.4.0/24AS8069Microsoft CorporationRPKI Valid20.33.4.0
- 20.33.5.0/24AS8069Microsoft CorporationRPKI Valid20.33.5.0
- 20.33.6.0/24AS8069Microsoft CorporationRPKI Valid20.33.6.0
- 20.33.8.0/24AS8069Microsoft CorporationRPKI Valid20.33.8.0
- 20.33.9.0/24AS8069Microsoft CorporationRPKI Valid20.33.9.0
- 20.33.12.0/24AS8069Microsoft CorporationRPKI Valid20.33.12.0
- 20.33.13.0/24AS8069Microsoft CorporationRPKI Valid20.33.13.0
- 20.33.14.0/24AS8069Microsoft CorporationRPKI Valid20.33.14.0
- 20.33.15.0/24AS8069Microsoft CorporationRPKI Valid20.33.15.0
- 20.33.17.0/24AS8069Microsoft CorporationRPKI Valid20.33.17.0
- 20.33.18.0/24AS8069Microsoft CorporationRPKI Valid20.33.18.0
- 20.33.19.0/24AS8069Microsoft CorporationRPKI Valid20.33.19.0
- 20.33.20.0/24AS8069Microsoft CorporationRPKI Valid20.33.20.0
- 20.33.21.0/24AS8069Microsoft CorporationRPKI Valid20.33.21.0
- 20.33.22.0/24AS8069Microsoft CorporationRPKI Valid20.33.22.0
- 20.33.23.0/24AS8069Microsoft CorporationRPKI Valid20.33.23.0
- 20.33.24.0/24AS8069Microsoft CorporationRPKI Valid20.33.24.0
- 20.33.25.0/24AS8069Microsoft CorporationRPKI Valid20.33.25.0
- 20.33.26.0/24AS8069Microsoft CorporationRPKI Valid20.33.26.0
- 20.33.27.0/24AS8069Microsoft CorporationRPKI Valid20.33.27.0
- 20.33.28.0/24AS8069Microsoft CorporationRPKI Valid20.33.28.0
- 20.33.29.0/24AS8069Microsoft CorporationRPKI Valid20.33.29.0
- 20.33.30.0/24AS8069Microsoft CorporationRPKI Valid20.33.30.0
- 20.33.31.0/24AS8069Microsoft CorporationRPKI Valid20.33.31.0
- 20.33.32.0/24AS8069Microsoft CorporationRPKI Valid20.33.32.0
- 20.33.33.0/24AS8069Microsoft CorporationRPKI Valid20.33.33.0
- 20.33.34.0/24AS8069Microsoft CorporationRPKI Valid20.33.34.0
- 20.33.35.0/24AS8069Microsoft CorporationRPKI Valid20.33.35.0
- 20.33.36.0/24AS8069Microsoft CorporationRPKI Valid20.33.36.0
- 20.33.37.0/24AS8069Microsoft CorporationRPKI Valid20.33.37.0
- 20.33.38.0/24AS8069Microsoft CorporationRPKI Valid20.33.38.0
- 20.33.39.0/24AS8069Microsoft CorporationRPKI Valid20.33.39.0
- 20.33.40.0/24AS8069Microsoft CorporationRPKI Valid20.33.40.0
- 20.33.41.0/24AS8069Microsoft CorporationRPKI Valid20.33.41.0
- 20.33.42.0/24AS8069Microsoft CorporationRPKI Valid20.33.42.0
- 20.33.43.0/24AS8069Microsoft CorporationRPKI Valid20.33.43.0
- 20.33.44.0/24AS8069Microsoft CorporationRPKI Valid20.33.44.0
- 20.33.45.0/24AS8069Microsoft CorporationRPKI Valid20.33.45.0
- 20.33.46.0/24AS8069Microsoft CorporationRPKI Valid20.33.46.0
- 20.33.47.0/24AS8069Microsoft CorporationRPKI Valid20.33.47.0
- 20.33.48.0/24AS8069Microsoft CorporationRPKI Valid20.33.48.0
- 20.33.49.0/24AS8069Microsoft CorporationRPKI Valid20.33.49.0
- 20.33.50.0/24AS8069Microsoft CorporationRPKI Valid20.33.50.0
- 20.33.51.0/24AS8069Microsoft CorporationRPKI Valid20.33.51.0
- 20.33.52.0/24AS8069Microsoft CorporationRPKI Valid20.33.52.0
- 20.33.53.0/24AS8069Microsoft CorporationRPKI Valid20.33.53.0
- 20.33.54.0/24AS8069Microsoft CorporationRPKI Valid20.33.54.0
- 20.33.55.0/24AS8069Microsoft CorporationRPKI Valid20.33.55.0
- 20.33.56.0/24AS8069Microsoft CorporationRPKI Valid20.33.56.0
- 20.33.57.0/24AS8069Microsoft CorporationRPKI Valid20.33.57.0
- 20.33.58.0/24AS8069Microsoft CorporationRPKI Valid20.33.58.0
- 20.33.59.0/24AS8069Microsoft CorporationRPKI Valid20.33.59.0
- 20.33.60.0/24AS8069Microsoft CorporationRPKI Valid20.33.60.0
- 20.33.61.0/24AS8069Microsoft CorporationRPKI Valid20.33.61.0
- 20.33.62.0/24AS8069Microsoft CorporationRPKI Valid20.33.62.0
- 20.33.63.0/24AS8069Microsoft CorporationRPKI Valid20.33.63.0
- 20.33.64.0/24AS8069Microsoft CorporationRPKI Valid20.33.64.0
- 20.33.65.0/24AS8069Microsoft CorporationRPKI Valid20.33.65.0
- 20.33.66.0/24AS8069Microsoft CorporationRPKI Valid20.33.66.0
- 20.33.67.0/24AS8069Microsoft CorporationRPKI Valid20.33.67.0
- 20.33.68.0/24AS8069Microsoft CorporationRPKI Valid20.33.68.0
- 20.33.69.0/24AS8069Microsoft CorporationRPKI Valid20.33.69.0
- 20.33.70.0/24AS8069Microsoft CorporationRPKI Valid20.33.70.0
- 20.33.72.0/24AS8069Microsoft CorporationRPKI Valid20.33.72.0
- 20.33.73.0/24AS8069Microsoft CorporationRPKI Valid20.33.73.0
- 20.33.74.0/24AS8069Microsoft CorporationRPKI Valid20.33.74.0
- 20.33.75.0/24AS8069Microsoft CorporationRPKI Valid20.33.75.0
- 20.33.76.0/24AS8069Microsoft CorporationRPKI Valid20.33.76.0
- 20.33.77.0/24AS8069Microsoft CorporationRPKI Valid20.33.77.0
- 20.33.78.0/24AS8069Microsoft CorporationRPKI Valid20.33.78.0
- 20.33.79.0/24AS8069Microsoft CorporationRPKI Valid20.33.79.0
- 20.33.80.0/24AS8069Microsoft CorporationRPKI Valid20.33.80.0
- 20.33.81.0/24AS8069Microsoft CorporationRPKI Valid20.33.81.0
- 20.33.83.0/24AS8069Microsoft CorporationRPKI Valid20.33.83.0
- 20.33.84.0/24AS8069Microsoft CorporationRPKI Valid20.33.84.0
- 20.33.85.0/24AS8069Microsoft CorporationRPKI Valid20.33.85.0
- 20.33.86.0/24AS8069Microsoft CorporationRPKI Valid20.33.86.0
- 20.33.87.0/24AS8069Microsoft CorporationRPKI Valid20.33.87.0
- 20.33.88.0/24AS8069Microsoft CorporationRPKI Valid20.33.88.0
- 20.33.89.0/24AS8069Microsoft CorporationRPKI Valid20.33.89.0
- 20.33.90.0/24AS8069Microsoft CorporationRPKI Valid20.33.90.0
- 20.33.91.0/24AS8069Microsoft CorporationRPKI Valid20.33.91.0
- 20.33.92.0/24AS8069Microsoft CorporationRPKI Valid20.33.92.0
- 20.33.93.0/24AS8069Microsoft CorporationRPKI Valid20.33.93.0
- 20.33.95.0/24AS8069Microsoft CorporationRPKI Valid20.33.95.0
- 20.33.96.0/24AS8069Microsoft CorporationRPKI Valid20.33.96.0
- 20.33.97.0/24AS8069Microsoft CorporationRPKI Valid20.33.97.0
- 20.33.98.0/24AS8069Microsoft CorporationRPKI Valid20.33.98.0
- 20.33.99.0/24AS8069Microsoft CorporationRPKI Valid20.33.99.0
- 20.33.100.0/23AS8069Microsoft CorporationRPKI Valid20.33.100.0
- 20.33.102.0/23AS8069Microsoft CorporationRPKI Valid20.33.102.0
- 20.33.104.0/24AS8069Microsoft CorporationRPKI Valid20.33.104.0
- 20.33.105.0/24AS8069Microsoft CorporationRPKI Valid20.33.105.0
- 20.33.107.0/24AS8069Microsoft CorporationRPKI Valid20.33.107.0
- 20.33.108.0/24AS8069Microsoft CorporationRPKI Valid20.33.108.0
- 20.33.109.0/24AS8069Microsoft CorporationRPKI Valid20.33.109.0
Showing the first 100.
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.