AS203645 Jan Ryznar
AS203645 (RYZNAR-AS) is registered to Jan Ryznar in CZ. It originates 27 prefixes in the global routing table.
Who holds AS203645
Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.
What AS203645 announces
Prefixes originated by AS203645 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).
Announced prefixes
Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.
RPKI valid RPKI invalid no ROA covers it
Who AS203645 is reached through
The AS just before AS203645 in the paths our looking glass collectors hold, for 27 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.
Routing registry objects
From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.
| Source | as-name | Maintained by |
|---|---|---|
| RIPE | RYZNAR-AS | RIPE-NCC-END-MNT, CZ-RPSNET-1-MNT |
Route objects with origin AS203645: RIPE 2