Home ASN LookupAS204064

AS204064 CEZNET-AS CEZNET s.r.o.

🇨🇿

Org handle: ORG-TBS13-RIPE

CEZNET s.r.o.

RIPE NCCallocated

Announced Prefixes (BGP)

6total

5 IPv41 IPv6

IPv4 Addresses

Allocated (RIR)4,352

Announced (BGP)4,352

IPv6 Addresses

Allocated (RIR)6.3×10²⁹

Announced (BGP)6.3×10²⁹

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

🇨🇿 CZ

RIR

RIPE NCC

Status

allocated

Allocated

2015-09-03

Routing hygiene

Score 13/100 · Low risk

RPKI ROA coverage

100%

no RPKI invalid prefixes

IRR route objects

83.3%

1 prefix registered for another origin

Hijack signals

0 announced against others' ROAs, 0 own announced by others

Upstreams

diversity 0/100

Only one upstream seen in the AS paths of its routes
17% of announced prefixes (1 of 6) have no IRR route object for this ASN

Based on 6 announced prefixes, updated daily (2026-10-18). How the score works · RPKI explained

Announced Prefixes

(BGP)6

Prefix	RPKI	IRR	Last Seen
185.115.180.0/22	Valid	RIPE	2026-10-26
185.116.48.0/22	Valid	RIPE	2026-10-26
185.116.51.0/24	Valid	-	2026-10-26
185.151.172.0/22	Valid	RIPE	2026-10-26
185.201.12.0/22	Valid	RIPE	2026-10-26
2a07:7a00::/29	Valid	RIPE	2026-10-26

Allocated Prefixes

(RIR)6

Prefix	Country	RIR	Status
185.115.180.0/22	🇨🇿 CZ	RIPENCC	allocated
185.116.48.0/22	🇨🇿 CZ	RIPENCC	allocated
185.116.51.0/24	🇨🇿 CZ	RIPE	assigned
185.151.172.0/22	🇨🇿 CZ	RIPENCC	allocated
185.201.12.0/22	🇨🇿 CZ	RIPENCC	allocated
2a07:7a00::/29	🇨🇿 CZ	RIPENCC	allocated

All 6 announced prefixes of AS204064 →

BGP Neighbours

(seen in AS paths)

Upstreams (1)

Networks AS204064 hands its own prefixes to: transit providers, or peers at an exchange.

AS47232ISPAlliance ISP Alliance A.S6

Downstreams (1)

Networks whose own prefixes AS204064 passes on: usually its customers.

AS51424ASAGNET Jiri Sperl2

Transfer History

Registry transfers of AS204064 between organisations.

AS204064Transfer · 2023-10-17
ISP Alliance a.s.
RIPE NCC
→
Ceznet sro
RIPE NCC
AS204064Transfer · 2018-11-23
TaNET West s.r.o.
RIPE NCC
→
ISP Alliance a.s.
RIPE NCC

Date	Resource	From	To	Type
2023-10-17	AS204064	ISP Alliance a.s. RIPE NCC	Ceznet sro RIPE NCC	Transfer
2018-11-23	AS204064	TaNET West s.r.o. RIPE NCC	ISP Alliance a.s. RIPE NCC	Transfer

ASPA

No ASPA

Abuse Contact

+31205354444

External Links

RIPE Whois RIPEstat

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 AS204064 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

GEThttps://api.ipctl.io/v1/asn/204064

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/204064" | jq