asn.dev

Autonomous system

AS51491 SYSGROUP-WALES

Unclassified RIPE

IPv4 addresses 1.02K 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly GB
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

SysGroup

United Kingdom · AI-generated

business telecom uk

The AS handle SYSGROUP-WALES is held by SysGroup plc.

What it's used for

  • The address space is registered under the netname UK-SYSGROUP-20130822 with registrant SysGroup plc.
  • The network announces a single IPv4 prefix, 185.33.184.0/22, comprising 1024 addresses, with no IPv6 prefixes in inventory.
  • With only one observed neighbour in the routing system, the network operates as a small, self-contained block rather than a transit provider or large-scale access network.
  • Traffic from this AS consists of corporate and business communications infrastructure, as SysGroup is a UK-based telecommunications provider offering managed services and connectivity solutions.

Notable

  • The registrant SysGroup plc matches the AS holder, confirming consistent ownership of the address space.
  • The inventory consists of a single contiguous /22 block, indicating a compact and focused address allocation.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS39537SysGroup plc116

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-17, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 1.02K addresses IPv6 0 prefixes

CountryNamePrefixes
GBUnited Kingdom1

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS51491
Registry name
SYSGROUP-WALES
Registrant
SysGroup plc
Abuse contact
abuse@sysgroup.com
Registered
2016-12-20
Last changed
2025-02-16
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 2 valid, 0 with no ROA
ROAs
1 authorising AS51491
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
3 naming AS51491

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,783 prefixes, as published 2026-10-17. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check