How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS51491 SysGroup plc | IPGeolocation.io

Q: Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

ASN Lookup Tool

SysGroup plc sysgroup.com

GB 2 Routes

AS Data

AS51491

AS51491 – SysGroup plc

AS Number	51491
AS Name	SYSGROUP-WALES
Organization	SysGroup plc (org-sp277-ripe)
Country	GB
Website	sysgroup.com
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	BUSINESS
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2016-12-20

ASN Intelligence API for production workflows

Use ASN data for AS51491 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
185.33.184.0/23	AS51491	SysGroup plc	SysGroup plc	512
185.33.186.0/23	AS51491	SysGroup plc	SysGroup plc	512

Raw Whois Response

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to 'AS51357 - AS51817'

as-block:       AS51357 - AS51817
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2025-02-13T13:57:44Z
last-modified:  2025-02-13T13:57:44Z
source:         RIPE

% Information related to 'AS51491'

% Abuse contact for 'AS51491' is 'abuse@sysgroup.com'

aut-num:        AS51491
as-name:        SYSGROUP-WALES
org:            ORG-SP277-RIPE
import:         from AS39537 accept ANY
export:         to AS39537 announce AS51491
admin-c:        SA43739-RIPE
tech-c:         SA43739-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         SYSGROUP-MNT
created:        2016-12-20T08:37:55Z
last-modified:  2025-02-16T16:10:31Z
source:         RIPE

organisation:   ORG-SP277-RIPE
org-name:       SysGroup plc
country:        GB
org-type:       LIR
address:        55 Spring Gardens
address:        M2 2BY
address:        Manchester
address:        UNITED KINGDOM
phone:          +44 333 101 9000
admin-c:        SA43739-RIPE
admin-c:        SA43739-RIPE
tech-c:         SA43739-RIPE
abuse-c:        AR38690-RIPE
mnt-ref:        SYSGROUP-MNT
mnt-ref:        SYSGROUP-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         SYSGROUP-MNT
created:        2016-12-15T08:39:05Z
last-modified:  2025-02-21T13:35:20Z
source:         RIPE # Filtered

role:           SYSGROUP-RIPE-DB-MAINTAINERS
address:        55 Spring Gardens, Manchester M2 2BY
nic-hdl:        SA43739-RIPE
mnt-by:         SYSGROUP-MNT
created:        2025-02-16T04:49:27Z
last-modified:  2025-02-16T04:49:27Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.121.2 (DEXTER)

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS51357 - AS51817",
    "description" : [ "RIPE NCC ASN block" ],
    "remarks" : [ "These AS Numbers are assigned to network operators in the RIPE NCC service region." ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT" ],
    "date_created" : "2025-02-13",
    "date_updated" : "2025-02-13",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS51491",
    "as_name" : "SYSGROUP-WALES",
    "status" : "ASSIGNED",
    "import" : [ "from AS39537 accept ANY" ],
    "export" : [ "to AS39537 announce AS51491" ],
    "organization" : "ORG-SP277-RIPE",
    "admin_contacts" : [ "SA43739-RIPE" ],
    "tech_contacts" : [ "SA43739-RIPE" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "SYSGROUP-MNT" ],
    "date_created" : "2016-12-20",
    "date_updated" : "2025-02-16",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-SP277-RIPE",
    "name" : "SysGroup plc",
    "type" : "LIR",
    "address" : [ "55 Spring Gardens", "M2 2BY", "Manchester", "UNITED KINGDOM" ],
    "street" : "Spring Gardens",
    "city" : "Manchester",
    "zip_code" : "M2 2BY",
    "country" : [ "GB" ],
    "phone" : [ "+44 333 101 9000" ],
    "admin_contacts" : [ "SA43739-RIPE", "SA43739-RIPE" ],
    "tech_contacts" : [ "SA43739-RIPE" ],
    "abuse_contacts" : [ "AR38690-RIPE" ],
    "mnt_ref" : [ "SYSGROUP-MNT", "SYSGROUP-MNT" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "SYSGROUP-MNT" ],
    "date_created" : "2016-12-15",
    "date_updated" : "2025-02-21",
    "source" : "RIPE",
    "addressCountry" : "UNITED KINGDOM"
  },
  "administrative_contacts" : [ {
    "handle" : "SA43739-RIPE",
    "name" : "SYSGROUP-RIPE-DB-MAINTAINERS",
    "address" : [ "55 Spring Gardens, Manchester M2 2BY" ],
    "street" : "Spring Gardens",
    "city" : "Manchester",
    "zip_code" : "M2 2BY",
    "mnt_by" : [ "SYSGROUP-MNT" ],
    "date_created" : "2025-02-16",
    "date_updated" : "2025-02-16",
    "source" : "RIPE"
  } ],
  "technical_contacts" : [ {
    "handle" : "SA43739-RIPE",
    "name" : "SYSGROUP-RIPE-DB-MAINTAINERS",
    "address" : [ "55 Spring Gardens, Manchester M2 2BY" ],
    "street" : "Spring Gardens",
    "city" : "Manchester",
    "zip_code" : "M2 2BY",
    "mnt_by" : [ "SYSGROUP-MNT" ],
    "date_created" : "2025-02-16",
    "date_updated" : "2025-02-16",
    "source" : "RIPE"
  } ]
}

Peers

AS Number	Description	Country
AS39537	SysGroup plc	GB

Upstreams

AS Number	Description	Country
AS39537	SysGroup plc	GB

Frequently Asked Questions

What is ASN AS51491?

ASN AS51491 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS51491?

AS51491 is listed under SysGroup plc.

What do peers, upstreams, and downstreams mean?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data included here?

WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.