ASN AS31438 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS31438?

AS31438 is listed under Stadtwerke Marburg 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.

AS31438 Stadtwerke Marburg GmbH

ASN Lookup Tool

Stadtwerke Marburg GmbH citynet-marburg.de

DE 3 Routes

AS Data

AS31438

AS31438 – Stadtwerke Marburg GmbH

AS Number	31438
AS Name	SWMR-AS
Organization	Stadtwerke Marburg GmbH (org-smg1-ripe)
Country	DE
Website	citynet-marburg.de
Number of IPv4 Routes	2
Number of IPv6 Routes	1
ASN type	BUSINESS
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2004-05-18

ASN Intelligence API for production workflows

Use ASN data for AS31438 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2a0d:5f00::/30	AS31438	Stadtwerke Marburg GmbH	Infrastructure ISP	~317×10²⁷
212.89.196.0/22	AS31438	Stadtwerke Marburg GmbH	Stadtwerke Marburg GmbH	1024
83.137.64.0/21	AS31438	Stadtwerke Marburg GmbH	Stadtwerke Marburg GmbH	2048

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 'AS31246 - AS31618'

as-block:       AS31246 - AS31618
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:        2018-11-22T15:27:33Z
last-modified:  2018-11-22T15:27:33Z
source:         RIPE

% Information related to 'AS31438'

% Abuse contact for 'AS31438' is 'support@citynet-marburg.de'

aut-num:        AS31438
as-name:        SWMR-AS
descr:          Citynet Marburg
import:         from AS9145 accept ANY
export:         to AS9145 announce AS31438
import:         from AS174 accept ANY
export:         to AS174 announce AS31438
import:         from AS8881 accept ANY
export:         to AS8881 announce AS31438
default:        to AS9066
org:            ORG-SMG1-RIPE
mp-import:      afi ipv6.unicast from AS174 accept ANY
mp-export:      afi ipv6.unicast to AS174 announce AS31438
mp-import:      afi ipv6.unicast from AS9145 accept ANY
mp-export:      afi ipv6.unicast to AS9145 announce AS31438
mp-import:      afi ipv6.unicast from AS8881 accept ANY
mp-export:      afi ipv6.unicast to AS8881 announce AS31438
admin-c:        koch2-RIPE
tech-c:         koch2-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         swmr-mnt
created:        2004-05-18T14:24:18Z
last-modified:  2026-01-22T10:47:25Z
source:         RIPE # Filtered

organisation:   ORG-SMG1-RIPE
org-name:       Stadtwerke Marburg GmbH
country:        DE
org-type:       LIR
address:        Am Krekel 55
address:        DE-35039
address:        Marburg
address:        GERMANY
phone:          +49 6421 2050
fax-no:         +49 6421 205550
admin-c:        koch2-RIPE
admin-c:        wan2-RIPE
abuse-c:        AR14743-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        SWMR-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         SWMR-MNT
created:        2004-04-17T11:12:27Z
last-modified:  2025-06-25T10:33:33Z
source:         RIPE # Filtered

person:         Lars Witter
address:        Stadtwerke Marburg GmbH, Am Krekel 55, D-35039 Marburg
phone:          +496421205181
nic-hdl:        koch2-RIPE
mnt-by:         swmr-mnt
created:        2003-12-12T11:25:35Z
last-modified:  2025-06-28T13:15:21Z
source:         RIPE

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

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS31246 - AS31618",
    "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" : "2018-11-22",
    "date_updated" : "2018-11-22",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS31438",
    "as_name" : "SWMR-AS",
    "description" : [ "Citynet Marburg" ],
    "status" : "ASSIGNED",
    "import" : [ "from AS9145 accept ANY", "from AS174 accept ANY", "from AS8881 accept ANY" ],
    "mp_import" : [ "afi ipv6.unicast from AS174 accept ANY", "afi ipv6.unicast from AS9145 accept ANY", "afi ipv6.unicast from AS8881 accept ANY" ],
    "export" : [ "to AS9145 announce AS31438", "to AS174 announce AS31438", "to AS8881 announce AS31438" ],
    "mp_export" : [ "afi ipv6.unicast to AS174 announce AS31438", "afi ipv6.unicast to AS9145 announce AS31438", "afi ipv6.unicast to AS8881 announce AS31438" ],
    "default" : [ "to AS9066" ],
    "organization" : "ORG-SMG1-RIPE",
    "admin_contacts" : [ "koch2-RIPE" ],
    "tech_contacts" : [ "koch2-RIPE" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "swmr-mnt" ],
    "date_created" : "2004-05-18",
    "date_updated" : "2026-01-22",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-SMG1-RIPE",
    "name" : "Stadtwerke Marburg GmbH",
    "type" : "LIR",
    "address" : [ "Am Krekel 55", "DE-35039", "Marburg", "GERMANY" ],
    "street" : "Am Krekel",
    "city" : "Marburg",
    "zip_code" : "DE-35039",
    "country" : [ "DE" ],
    "phone" : [ "+49 6421 2050" ],
    "fax_no" : [ "+49 6421 205550" ],
    "admin_contacts" : [ "koch2-RIPE", "wan2-RIPE" ],
    "abuse_contacts" : [ "AR14743-RIPE" ],
    "mnt_ref" : [ "RIPE-NCC-HM-MNT", "SWMR-MNT" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "SWMR-MNT" ],
    "date_created" : "2004-04-17",
    "date_updated" : "2025-06-25",
    "source" : "RIPE",
    "addressCountry" : "GERMANY"
  },
  "administrative_contacts" : [ {
    "handle" : "koch2-RIPE",
    "name" : "Lars Witter",
    "address" : [ "Stadtwerke Marburg GmbH, Am Krekel 55, D-35039 Marburg" ],
    "street" : "Am Krekel",
    "city" : "Marburg",
    "zip_code" : "D-35039",
    "phone" : [ "+496421205181" ],
    "mnt_by" : [ "swmr-mnt" ],
    "date_created" : "2003-12-12",
    "date_updated" : "2025-06-28",
    "source" : "RIPE"
  } ],
  "technical_contacts" : [ {
    "handle" : "koch2-RIPE",
    "name" : "Lars Witter",
    "address" : [ "Stadtwerke Marburg GmbH, Am Krekel 55, D-35039 Marburg" ],
    "street" : "Am Krekel",
    "city" : "Marburg",
    "zip_code" : "D-35039",
    "phone" : [ "+496421205181" ],
    "mnt_by" : [ "swmr-mnt" ],
    "date_created" : "2003-12-12",
    "date_updated" : "2025-06-28",
    "source" : "RIPE"
  } ]
}

Peers

AS Number	Description	Country
AS9145	EWE TEL GmbH	DE
AS8881	1&1 Versatel GmbH	DE
AS174	Cogent Communications, LLC	US

Upstreams

AS Number	Description	Country
AS9145	EWE TEL GmbH	DE
AS8881	1&1 Versatel GmbH	DE