ASN AS51191 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS51191?

AS51191 is listed under Core Backbone GmbH.

What do peers, upstreams, and downstreams mean in ASN data?

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 shown for an ASN?

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

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.

AS51191 Core Backbone GmbH | IPGeolocation.io

ASN Lookup Tool

Core Backbone GmbH core-backbone.com

DE 236 Routes

AS Data

AS51191

AS51191 – Core Backbone GmbH

AS Number	51191
AS Name	XIRRA
Organization	Core Backbone GmbH (org-iicg1-ripe)
Country	DE
Website	core-backbone.com
Number of IPv4 Routes	8
Number of IPv6 Routes	228
ASN type	ISP
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2011-02-07

ASN Intelligence API for production workflows

Use ASN data for AS51191 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2a06:4b01:336c::/48	AS51191	Core Backbone GmbH	GCORE LABS	~1×10²⁴
2a06:4b01:3359::/48	AS51191	Core Backbone GmbH	GCORE LABS	~1×10²⁴
2a06:4b01:351d::/48	AS51191	Core Backbone GmbH	DATAPACKET	~1×10²⁴
2a06:4b01:3551::/48	AS51191	Core Backbone GmbH	DATAPACKET	~1×10²⁴
2a06:4b01:3370::/48	AS51191	Core Backbone GmbH	GCORE LABS	~1×10²⁴
2a06:4b01:332a::/48	AS51191	Core Backbone GmbH	GCORE LABS	~1×10²⁴
2a06:4b01:354d::/48	AS51191	Core Backbone GmbH	DATAPACKET	~1×10²⁴
2a06:4b01:3329::/48	AS51191	Core Backbone GmbH	GCORE LABS	~1×10²⁴
2a06:4b01:3563::/48	AS51191	Core Backbone GmbH	DATAPACKET	~1×10²⁴
2a06:4b01:352f::/48	AS51191	Core Backbone GmbH	DATAPACKET	~1×10²⁴

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 'AS50893 - AS51311'

as-block:       AS50893 - AS51311
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:        2024-12-10T14:54:30Z
last-modified:  2024-12-10T14:54:30Z
source:         RIPE

% Information related to 'AS51191'

% Abuse contact for 'AS51191' is 'abuse@core-backbone.com'

aut-num:        AS51191
as-name:        XIRRA
org:            ORG-IICG1-RIPE
import:         from AS33891 accept ANY
export:         to AS33891 announce AS-XIRRA
import:         from AS199524 accept ANY
export:         to AS199524 announce AS-XIRRA
admin-c:        LG6981-RIPE
tech-c:         LG6981-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         CORE-BACKBONE
created:        2011-02-07T16:13:12Z
last-modified:  2025-06-25T06:17:58Z
source:         RIPE

organisation:   ORG-IICG1-RIPE
org-name:       Core-Backbone GmbH
country:        DE
org-type:       LIR
address:        Deutschherrnstr. 15-19
address:        90429
address:        N�rnberg
address:        GERMANY
phone:          +4991131043200
admin-c:        DM2147-RIPE
admin-c:        UK489-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        CORE-BACKBONE
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         CORE-BACKBONE
abuse-c:        CN2660-RIPE
created:        2004-04-17T11:08:15Z
last-modified:  2024-12-03T11:28:43Z
source:         RIPE # Filtered

person:         Xirra Net
address:        Core-Backbone GmbH
address:        Deutschherrnstr. 15-19
address:        90429 N�rnberg
address:        Germany
phone:          +4991131043200
nic-hdl:        LG6981-RIPE
mnt-by:         CORE-BACKBONE
created:        2013-11-18T11:24:29Z
last-modified:  2025-12-04T14:32:01Z
source:         RIPE

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

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS50893 - AS51311",
    "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" : "2024-12-10",
    "date_updated" : "2024-12-10",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS51191",
    "as_name" : "XIRRA",
    "status" : "ASSIGNED",
    "import" : [ "from AS33891 accept ANY", "from AS199524 accept ANY" ],
    "export" : [ "to AS33891 announce AS-XIRRA", "to AS199524 announce AS-XIRRA" ],
    "organization" : "ORG-IICG1-RIPE",
    "admin_contacts" : [ "LG6981-RIPE" ],
    "tech_contacts" : [ "LG6981-RIPE" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "CORE-BACKBONE" ],
    "date_created" : "2011-02-07",
    "date_updated" : "2025-06-25",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-IICG1-RIPE",
    "name" : "Core-Backbone GmbH",
    "type" : "LIR",
    "address" : [ "Deutschherrnstr. 15-19", "90429", "N?rnberg", "GERMANY" ],
    "street" : "90429 N?",
    "city" : "Rnberg",
    "country" : [ "DE" ],
    "phone" : [ "+4991131043200" ],
    "admin_contacts" : [ "DM2147-RIPE", "UK489-RIPE" ],
    "abuse_contacts" : [ "CN2660-RIPE" ],
    "mnt_ref" : [ "RIPE-NCC-HM-MNT", "CORE-BACKBONE" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "CORE-BACKBONE" ],
    "date_created" : "2004-04-17",
    "date_updated" : "2024-12-03",
    "source" : "RIPE",
    "addressCountry" : "GERMANY"
  },
  "administrative_contacts" : [ {
    "handle" : "LG6981-RIPE",
    "name" : "Xirra Net",
    "address" : [ "Core-Backbone GmbH", "Deutschherrnstr. 15-19", "90429 N?rnberg", "Germany" ],
    "street" : "90429 N?",
    "city" : "Rnberg",
    "country" : "GERMANY",
    "phone" : [ "+4991131043200" ],
    "mnt_by" : [ "CORE-BACKBONE" ],
    "date_created" : "2013-11-18",
    "date_updated" : "2025-12-04",
    "source" : "RIPE",
    "addressCountry" : "GERMANY"
  } ],
  "technical_contacts" : [ {
    "handle" : "LG6981-RIPE",
    "name" : "Xirra Net",
    "address" : [ "Core-Backbone GmbH", "Deutschherrnstr. 15-19", "90429 N?rnberg", "Germany" ],
    "street" : "90429 N?",
    "city" : "Rnberg",
    "country" : "GERMANY",
    "phone" : [ "+4991131043200" ],
    "mnt_by" : [ "CORE-BACKBONE" ],
    "date_created" : "2013-11-18",
    "date_updated" : "2025-12-04",
    "source" : "RIPE",
    "addressCountry" : "GERMANY"
  } ]
}

Peers

AS Number	Description	Country
AS60068	Datacamp Limited	GB
AS33891	Core-Backbone GmbH	DE
AS20473	The Constant Company, LLC	US
AS199524	G Core Labs S.A.	LU
AS33891	Core Backbone GmbH	DE

Upstreams

AS Number	Description	Country
AS60068	Datacamp Limited	GB
AS20473	The Constant Company, LLC	US
AS199524	G Core Labs S.A.	LU
AS33891	Core Backbone GmbH	DE