Routing security
AS51521 ASKMNET
Unclassified RIPE
Announcements
What this network originates
Every prefix observed with AS51521 as its origin, checked against RPKI and the IRR. Problems sort first.
| Prefix | RPKI | IRR | Vantage points |
|---|---|---|---|
| 91.217.96.0/23 | RPKI valid | IRR | 53 |
RPKI · ROAs
Route origin authorisations
Signed statements by address holders that AS51521 may originate these prefixes, up to the maximum length shown.
| Prefix | Max length | Trust anchor |
|---|---|---|
| 91.217.96.0/23 | /24 | RIPENCC |
ROA-based and RPKI-valid-only prefix lists for routers are on asn.ipinfo.app.
RPKI · ASPA
Declared transit providers
This network has signed an ASPA record naming its transit providers. Each is compared against the upstreams observed in routing paths.
| AS | Network | ASPA | Routing paths |
|---|---|---|---|
| AS16019 | Vodafone Czech Republic a.s. | Declared | Observed |
| AS24641 | FASTER CZ spol. s r.o. | Declared | Observed |
An observed upstream that is not declared is not necessarily a leak: our upstream inference cannot tell a transit provider from a peer seen in the same position. A declared provider that is never observed is usually a backup path.
IRR
Registered route objects
Route objects naming AS51521 as origin, across RADb, the RIR registries, ALTDB and NTTCOM. Objects that are registered but not announced come first: a stale object lets anyone who can spoof this origin through an IRR-built filter.
| Prefix | Source | Description | Maintainer | Changed | Routing |
|---|---|---|---|---|---|
| 91.217.96.0/23 | RIPE | — | RESIDENT-MNT | 2022-03-29 | Announced |
IRR
AS-sets
The as-set is what upstreams expand to build this network's customer filter. Sets that list AS51521 directly show who expects to carry it.
| AS-set | Where | Relationship |
|---|---|---|
AS-CETIN | RIPE | Lists AS51521 as a direct member |
AS-FASTER-CUST | RIPE | Lists AS51521 as a direct member |
AS-VODAFONE-CZ-B2B | RIPE | Lists AS51521 as a direct member |
RPKI from rpki-client, validated 2026-10-23 12:03 UTC. IRR from ARIN, RADB, RIPE, ALTDB, APNIC, LACNIC, NTTCOM, AFRINIC, collected 2026-10-23. Cross-check on bgp.he.net.