Home ASN LookupAS203645

AS203645 RYZNAR-AS Jan Ryznar

🇨🇿

Org handle: ORG-JR41-RIPE

RIPE NCCallocated

Announced Prefixes (BGP)

27total

4 IPv423 IPv6

IPv4 Addresses

Allocated (RIR)2,048

Announced (BGP)1,024

IPv6 Addresses

Allocated (RIR)8.2×10²⁸

Announced (BGP)4.3×10²⁷

Prefix Limit (IPv4)

Prefix Limit (IPv6)

100

Country

🇨🇿 CZ

RIR

RIPE NCC

Status

allocated

Allocated

2016-01-07

Announced Prefixes

(BGP)27

Prefix	RPKI	IRR	Last Seen
185.133.188.0/24	No ROA	-	2026-10-11
185.133.189.0/24	No ROA	-	2026-10-11
185.133.190.0/24	No ROA	-	2026-10-11
185.133.191.0/24	No ROA	-	2026-10-11
2a01:7d20:100::/40	No ROA	-	2026-10-11
2a01:7d20:101::/48	No ROA	-	2026-10-11
2a01:7d20:200::/40	No ROA	-	2026-10-11
2a01:7d20:201::/48	No ROA	-	2026-10-11
2a01:7d20:300::/40	No ROA	-	2026-10-11
2a01:7d20:300::/48	No ROA	-	2026-10-11

1-10 of 27

1 / 3

Allocated Prefixes

(RIR)16

Prefix	Country	RIR	Status
185.133.188.0/22	🇨🇿 CZ	RIPENCC	allocated
185.133.188.0/24	🇨🇿 CZ	RIPE	assigned
185.133.189.0/24	🇨🇿 CZ	RIPE	assigned
185.133.190.0/24	🇨🇿 CZ	RIPE	assigned
185.133.191.0/24	🇨🇿 CZ	RIPE	assigned
2a01:7d20::/32	🇨🇿 CZ	RIPENCC	allocated
2a01:7d20:100::/40	🇨🇿 CZ	RIPE	assigned
2a01:7d20:200::/40	🇨🇿 CZ	RIPE	assigned
2a01:7d20:300::/40	🇨🇿 CZ	RIPE	assigned
2a01:7d20:500::/40	🇨🇿 CZ	RIPE	assigned

1-10 of 16

1 / 2

All 27 announced prefixes of AS203645 →

BGP Neighbours

(seen in AS paths)

Upstreams (1)

Networks AS203645 hands its own prefixes to: transit providers, or peers at an exchange.

AS28725CETIN A.S27

ASPA

No ASPA

Abuse Contact

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 AS203645 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/203645

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

curl -s "https://api.ipctl.io/v1/asn/203645" | jq