Home ASN LookupAS25291

AS25291 SYSELEVEN SysEleven GmbH

🇩🇪

Org handle: ORG-SG57-RIPE

SysEleven GmbH

RIPE NCCallocated

Announced Prefixes (BGP)

52total

38 IPv414 IPv6

IPv4 Addresses

Allocated (RIR)40,448

Announced (BGP)44,544

IPv6 Addresses

Allocated (RIR)7.9×10²⁸

Announced (BGP)1.2×10²⁹

Prefix Limit (IPv4)

100

Prefix Limit (IPv6)

Country

🇩🇪 DE

RIR

RIPE NCC

Status

allocated

Allocated

2009-12-07

Routing hygiene

Score 7/100 · Low risk

RPKI ROA coverage

100%

no RPKI invalid prefixes

IRR route objects

100%

no origin mismatches

Hijack signals

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

Upstreams

diversity 29/100

Routes concentrated on one upstream (83% of routes)

Based on 52 announced prefixes, updated daily (2026-10-25). How the score works · RPKI explained

Announced Prefixes

(BGP)52

Prefix	RPKI	IRR	Last Seen
37.44.0.0/21	Valid	RIPE	2026-10-26
37.44.1.0/24	Valid	RIPE	2026-10-26
37.49.152.0/21	Valid	RIPE	2026-10-26
37.49.152.0/24	Valid	RIPE	2026-10-26
37.49.153.0/24	Valid	RIPE	2026-10-26
37.49.159.0/24	Valid	RIPE	2026-10-26
37.123.104.0/21	Valid	RIPE	2026-10-26
37.123.106.0/24	Valid	RIPE	2026-10-26
37.123.108.0/24	Valid	RIPE	2026-10-26
37.123.109.0/24	Valid	RIPE	2026-10-26

1-10 of 52

1 / 6

Allocated Prefixes

(RIR)24

Prefix	Country	RIR	Status
37.44.0.0/21	🇩🇪 DE	RIPENCC	allocated
37.49.152.0/21	🇩🇪 DE	RIPENCC	allocated
37.49.159.0/24	🇩🇪 DE	RIPE	assigned
37.123.104.0/21	🇩🇪 DE	RIPENCC	allocated
37.123.109.0/24	🇩🇪 DE	RIPE	assigned
77.247.80.0/21	🇩🇪 DE	RIPENCC	allocated
77.247.84.0/24	🇩🇪 DE	RIPE	assigned
109.68.224.0/21	🇩🇪 DE	RIPENCC	allocated
147.93.208.0/22	🇩🇪 DE	RIPENCC	assigned
151.252.40.0/21	🇩🇪 DE	RIPENCC	allocated

1-10 of 24

1 / 3

All 52 announced prefixes of AS25291 →

Downstream Customers(1)

ASN	Name
AS211286	🇩🇪MEASUREMENT-NETWORK Tobias Fiebig

BGP Neighbours

(seen in AS paths)

Upstreams (2)

Networks AS25291 hands its own prefixes to: transit providers, or peers at an exchange.

AS5405INTERDOTLINK Inter.Link43
AS1299TWELVE99 Arelion Sweden AB9

ASPA

No ASPA0 upstreams, 1 downstream

Listed as Upstream Provider by

1 ASN

View full ASPA details →

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
How to run an ASPA checkVerify the upstream providers listed above
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/25291

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

curl -s "https://api.ipctl.io/v1/asn/25291" | jq