Home ASN LookupAS210728

AS210728 CYSO-AS-DE Cyso Group B.V.

🇳🇱

Org handle: ORG-CGB5-RIPE

CYSO-AMS

RIPE NCCallocated

Announced Prefixes (BGP)

4total

3 IPv41 IPv6

IPv4 Addresses

Allocated (RIR)768

Announced (BGP)768

IPv6 Addresses

Allocated (RIR)7.9×10²⁸

Announced (BGP)7.9×10²⁸

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

🇳🇱 NL

RIR

RIPE NCC

Status

allocated

Allocated

2021-09-22

Announced Prefixes

(BGP)4

Prefix	RPKI	IRR	Last Seen
77.246.243.0/24	Valid	RIPE	2026-10-11
194.26.103.0/24	Valid	RIPE	2026-10-11
213.173.39.0/24	Valid	RIPE	2026-10-11
2a11:2440::/32	Valid	RIPE	2026-10-11

Allocated Prefixes

(RIR)4

Prefix	Country	RIR	Status
77.246.243.0/24	🇳🇱 NL	RIPENCC	allocated
194.26.103.0/24	🇳🇱 NL	RIPENCC	allocated
213.173.39.0/24	🇳🇱 NL	RIPENCC	allocated
2a11:2440::/32	🇳🇱 NL	RIPENCC	allocated

All 4 announced prefixes of AS210728 →

BGP Neighbours

(seen in AS paths)

Upstreams (3)

Networks AS210728 hands its own prefixes to: transit providers, or peers at an exchange.

AS25151CYSO Group B.V2
AS3356Level 3 Parent1
AS33891CORE BACKBONE Core Backbone1

Downstreams (1)

Networks whose own prefixes AS210728 passes on: usually its customers.

AS44694FUGA NL 1 Cyso Group B.V3

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 AS210728 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/210728

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

curl -s "https://api.ipctl.io/v1/asn/210728" | jq