What is ASN AS203135?

ASN AS203135 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS203135?

AS203135 is listed under CTNET B.V..

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.

AS203135 CTNET B.V. | IPGeolocation.io

ASN Lookup Tool

CTNET B.V. ctnet.nl

NL 3 Routes

AS Data

AS203135

AS203135 – CTNET B.V.

AS Number	203135
AS Name	CTNET
Organization	CTNET B.V.(org-cb270-ripe)
Country	NL
Website	ctnet.nl
Number of IPv4 Routes	2
Number of IPv6 Routes	1
ASN type	ISP
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2025-12-05

ASN Intelligence API for production workflows

Use ASN data for AS203135 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2a13:bdc0::/29	AS203135	CTNET B.V.	CTNET HAARLEM	~634×10²⁷
185.45.148.0/24	AS203135	CTNET B.V.	CTNET B.V.	256
193.189.89.0/24	AS203135	CTNET B.V.	CTNET B.V.	256

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 'AS203113 - AS203887'

as-block:       AS203113 - AS203887
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:        2024-11-12T15:22:00Z
last-modified:  2024-11-12T15:22:00Z
source:         RIPE

% Information related to 'AS203135'

% Abuse contact for 'AS203135' is 'abuse@ctnet.nl'

aut-num:        AS203135
as-name:        CTNET
org:            ORG-CB270-RIPE
remarks:        -- --------------- Transits -- ---------------
remarks:        -
remarks:        OSSO
import:         from AS43366 accept ANY
mp-import:      afi ipv6.unicast from AS43366 accept ANY
export:         to AS43366 announce AS203135:AS-CTNET-NL
mp-export:      afi ipv6.unicast to AS43366 announce AS203135:AS-CTNET-NL
remarks:        -
remarks:        ViaData
import:         from AS209390 accept ANY
mp-import:      afi ipv6.unicast from AS209390 accept ANY
export:         to AS209390 announce AS203135:AS-CTNET-NL
mp-export:      afi ipv6.unicast to AS209390 announce AS203135:AS-CTNET-NL
remarks:        -
admin-c:        RB48327-RIPE
tech-c:         RB48327-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         CTNET-MNT
created:        2025-12-05T14:06:41Z
last-modified:  2025-12-11T20:49:51Z
source:         RIPE

organisation:   ORG-CB270-RIPE
org-name:       CTNET B.V.
country:        NL
org-type:       LIR
address:        Meerweg 143
address:        9752 XA
address:        Haren
address:        NETHERLANDS
phone:          +31.881101100
admin-c:        RB48327-RIPE
tech-c:         RB48327-RIPE
abuse-c:        AR72374-RIPE
mnt-ref:        CTNET-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         CTNET-MNT
created:        2023-08-24T12:43:40Z
last-modified:  2025-12-05T12:33:47Z
source:         RIPE # Filtered

person:         Rudy Broersma
address:        de Keizerlibel 23
address:        9766 RB
address:        Eelderwolde
phone:          +31641306816
nic-hdl:        RB48327-RIPE
mnt-by:         CTNET-MNT
created:        2024-04-12T11:01:41Z
last-modified:  2025-12-05T12:43:12Z
source:         RIPE # Filtered
mnt-ref:        CTNET-MNT

% 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" : "AS203113 - AS203887",
    "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" : "2024-11-12",
    "date_updated" : "2024-11-12",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS203135",
    "as_name" : "CTNET",
    "status" : "ASSIGNED",
    "import" : [ "from AS43366 accept ANY", "from AS209390 accept ANY" ],
    "mp_import" : [ "afi ipv6.unicast from AS43366 accept ANY", "afi ipv6.unicast from AS209390 accept ANY" ],
    "export" : [ "to AS43366 announce AS203135:AS-CTNET-NL", "to AS209390 announce AS203135:AS-CTNET-NL" ],
    "mp_export" : [ "afi ipv6.unicast to AS43366 announce AS203135:AS-CTNET-NL", "afi ipv6.unicast to AS209390 announce AS203135:AS-CTNET-NL" ],
    "organization" : "ORG-CB270-RIPE",
    "admin_contacts" : [ "RB48327-RIPE" ],
    "tech_contacts" : [ "RB48327-RIPE" ],
    "remarks" : [ "-- --------------- Transits -- ---------------", "-", "OSSO", "-", "ViaData", "-" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "CTNET-MNT" ],
    "date_created" : "2025-12-05",
    "date_updated" : "2025-12-11",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-CB270-RIPE",
    "name" : "CTNET B.V.",
    "type" : "LIR",
    "address" : [ "Meerweg 143", "9752 XA", "Haren", "NETHERLANDS" ],
    "street" : "Xa",
    "city" : "Haren",
    "zip_code" : "9752",
    "country" : [ "NL" ],
    "phone" : [ "+31.881101100" ],
    "admin_contacts" : [ "RB48327-RIPE" ],
    "tech_contacts" : [ "RB48327-RIPE" ],
    "abuse_contacts" : [ "AR72374-RIPE" ],
    "mnt_ref" : [ "CTNET-MNT" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "CTNET-MNT" ],
    "date_created" : "2023-08-24",
    "date_updated" : "2025-12-05",
    "source" : "RIPE",
    "addressCountry" : "NETHERLANDS"
  },
  "administrative_contacts" : [ {
    "handle" : "RB48327-RIPE",
    "name" : "Rudy Broersma",
    "address" : [ "de Keizerlibel 23", "9766 RB", "Eelderwolde" ],
    "street" : "Rb Eelderwolde",
    "zip_code" : "9766",
    "phone" : [ "+31641306816" ],
    "mnt_by" : [ "CTNET-MNT" ],
    "mnt_ref" : [ "CTNET-MNT" ],
    "date_created" : "2024-04-12",
    "date_updated" : "2025-12-05",
    "source" : "RIPE"
  } ],
  "technical_contacts" : [ {
    "handle" : "RB48327-RIPE",
    "name" : "Rudy Broersma",
    "address" : [ "de Keizerlibel 23", "9766 RB", "Eelderwolde" ],
    "street" : "Rb Eelderwolde",
    "zip_code" : "9766",
    "phone" : [ "+31641306816" ],
    "mnt_by" : [ "CTNET-MNT" ],
    "mnt_ref" : [ "CTNET-MNT" ],
    "date_created" : "2024-04-12",
    "date_updated" : "2025-12-05",
    "source" : "RIPE"
  } ]
}

Peers

AS Number	Description	Country
AS209390	CTNET ICT Infrastructuur B.V	NL
AS43366	OSSO B.V.	NL

Upstreams

AS Number	Description	Country
AS43366	OSSO B.V.	NL