AS57728 CEZNET-AS CEZNET s.r.o.
🇨🇿Org handle: ORG-TBS13-RIPE
RIPE NCCallocated
Announced Prefixes (BGP)
8total
5 IPv43 IPv6
IPv4 Addresses
Allocated (RIR)11,264
Announced (BGP)15,360
IPv6 Addresses
Allocated (RIR)1.5×10²⁹
Announced (BGP)2.3×10²⁹
Announced Prefixes
(BGP)8|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 | |
| Valid | RIPE | 2026-10-11 |
Allocated Prefixes
(RIR)5Prefix | Country | RIR | Status |
|---|---|---|---|
| 109.234.40.0/21 | 🇨🇿 CZ | RIPENCC | allocated |
| 185.255.116.0/22 | 🇨🇿 CZ | RIPENCC | allocated |
| 188.122.192.0/19 | 🇨🇿 CZ | RIPENCC | allocated |
| 2a00:1807::/32 | 🇨🇿 CZ | RIPE | assigned |
| 2a0a:b6c0::/32 | 🇨🇿 CZ | RIPENCC | allocated |
All 8 announced prefixes of AS57728 →
BGP Neighbours
(seen in AS paths)Upstreams (1)
Networks AS57728 hands its own prefixes to: transit providers, or peers at an exchange.
- AS39791TPS Telco Pro Services, A. S8
Transfer History
Registry transfers of AS57728 between organisations.
- AS57728Transfer ·
- AS57728M&A ·
ASPA
No ASPA
Abuse Contact
+31205354444
External Links
Learn more
- What is an ASN?Autonomous systems, ASN ranges and how they are assigned
- RPKI and route origin validationWhat the RPKI badges on the prefix list mean
- ASPA explainedWhy AS57728 should publish an ASPA object
- IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
- ASN data in AI agents and SIEMMCP server and API integrations
API
Open https://api.ipctl.io/v1/asn/57728Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/57728" | jq