What is ASN AS204921?

ASN AS204921 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS204921?

AS204921 is listed under zhenyun sun.

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.

AS204921 zhenyun sun | IPGeolocation.io

ASN Lookup Tool

zhenyun sun as204921.net

GB 1 Routes

AS Data

AS204921

AS204921 – zhenyun sun

AS Number	204921
AS Name	YunZheng-Network
Organization	zhenyun sun (org-zs89-ripe)
Country	GB
Website	as204921.net
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	ISP
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2025-10-10

ASN Intelligence API for production workflows

Use ASN data for AS204921 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
142.249.114.0/24	AS204921	zhenyun sun	ZHENYUN SUN RESEARCH NETWORK	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 'AS203940 - AS205662'

as-block:       AS203940 - AS205662
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:        2026-03-05T15:29:31Z
last-modified:  2026-03-05T15:29:31Z
source:         RIPE

% Information related to 'AS204921'

% Abuse contact for 'AS204921' is 'noc@as204921.net'

aut-num:        AS204921
as-name:        YunZheng-Network
descr:          Yunzheng.Space Research Network
org:            ORG-ZS89-RIPE
remarks:        ==================================================
remarks:        | UPSTREAMS
remarks:        ==================================================
remarks:        | Zare.com EU
mp-import:      afi any.unicast from AS25369 accept ANY
mp-export:      afi any.unicast to AS25369 announce AS204921:AS-DOWNSTREAMS
remarks:        | Zare.com APAC
mp-import:      afi any.unicast from AS58325 accept ANY
mp-export:      afi any.unicast to AS58325 announce AS204921:AS-DOWNSTREAMS
remarks:        | RAID NETWORK - TPE
mp-import:      afi any.unicast from AS18423 accept ANY
mp-export:      afi any.unicast to AS18423 announce AS204921:AS-DOWNSTREAMS
remarks:        | IDC Cube - HKG
mp-import:      afi any.unicast from AS36530 accept ANY
mp-export:      afi any.unicast to AS36530 announce AS204921:AS-DOWNSTREAMS
remarks:        | Sky Digital Co., Ltd. - TPE
mp-import:      afi any.unicast from AS134823 accept ANY
mp-export:      afi any.unicast to AS134823 announce AS204921:AS-DOWNSTREAMS
remarks:        ==================================================
remarks:        | INTERNET EXCHNAGE POINTS
remarks:        ==================================================
remarks:        - IIX | impart-ix.net
mp-import:      from AS198250 accept ANY
mp-export:      to AS198250 announce AS204921:AS-DOWNSTREAMS
remarks:        - STUIX | stuix.io
mp-import:      from AS38855 accept ANY
mp-export:      to AS38855 announce AS204921:AS-DOWNSTREAMS
remarks:        - TPIX-TW | tpix.net.tw
mp-import:      from AS10133 accept ANY
mp-export:      to AS10133 announce AS204921:AS-DOWNSTREAMS
remarks:        =================================================
sponsoring-org: ORG-ANL45-RIPE
admin-c:        ZS2129-RIPE
tech-c:         ZS2129-RIPE
remarks:        b222bfa2d373adb3b9314a52c0f4512b
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         ZHNET-MNT
mnt-by:         ZYS-MNT
created:        2025-10-10T09:11:08Z
last-modified:  2026-05-02T19:38:19Z
source:         RIPE

organisation:   ORG-ZS89-RIPE
remarks:        ====================================
org-name:       zhenyun sun
descr:          zhenyun.sun - YunZheng.Space/Network
remarks:        ====================================
country:        GB
reg-nr:         Not Applicable
language:       EN
language:       ZH
remarks:        ====================================
org-type:       OTHER
address:        Tartu mnt 67/1-13b, Harjuuma
address:        10115
address:        Tallinn
address:        Estonia
phone:          +852-31651702
remarks:        ====================================
admin-c:        ZS2129-RIPE
tech-c:         ZS2129-RIPE
abuse-c:        ACRO61962-RIPE
mnt-ref:        ZYS-MNT
mnt-by:         ZYS-MNT
mnt-ref:        JIANYUELAB-STAFF-MNT
created:        2025-10-06T22:27:35Z
last-modified:  2026-05-13T05:35:32Z
source:         RIPE # Filtered

person:         ZHENYUN SUN
address:        67-1/13b Tartu mnt, Harjumma, Tallinn, Estonia
phone:          +852-31651702
nic-hdl:        ZS2129-RIPE
mnt-by:         ZYS-MNT
created:        2025-10-06T22:24:20Z
last-modified:  2026-04-27T08:14:30Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.122.1 (ABERDEEN)

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS203940 - AS205662",
    "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" : "2026-03-05",
    "date_updated" : "2026-03-05",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS204921",
    "as_name" : "YunZheng-Network",
    "description" : [ "Yunzheng.Space Research Network" ],
    "status" : "ASSIGNED",
    "mp_import" : [ "afi any.unicast from AS25369 accept ANY", "afi any.unicast from AS58325 accept ANY", "afi any.unicast from AS18423 accept ANY", "afi any.unicast from AS36530 accept ANY", "afi any.unicast from AS134823 accept ANY", "from AS198250 accept ANY", "from AS38855 accept ANY", "from AS10133 accept ANY" ],
    "mp_export" : [ "afi any.unicast to AS25369 announce AS204921:AS-DOWNSTREAMS", "afi any.unicast to AS58325 announce AS204921:AS-DOWNSTREAMS", "afi any.unicast to AS18423 announce AS204921:AS-DOWNSTREAMS", "afi any.unicast to AS36530 announce AS204921:AS-DOWNSTREAMS", "afi any.unicast to AS134823 announce AS204921:AS-DOWNSTREAMS", "to AS198250 announce AS204921:AS-DOWNSTREAMS", "to AS38855 announce AS204921:AS-DOWNSTREAMS", "to AS10133 announce AS204921:AS-DOWNSTREAMS" ],
    "organization" : "ORG-ZS89-RIPE",
    "sponsoring_organization" : "ORG-ANL45-RIPE",
    "admin_contacts" : [ "ZS2129-RIPE" ],
    "tech_contacts" : [ "ZS2129-RIPE" ],
    "remarks" : [ "==================================================", "| UPSTREAMS", "==================================================", "| Zare.com EU", "| Zare.com APAC", "| RAID NETWORK - TPE", "| IDC Cube - HKG", "| Sky Digital Co., Ltd. - TPE", "==================================================", "| INTERNET EXCHNAGE POINTS", "==================================================", "- IIX | impart-ix.net", "- STUIX | stuix.io", "- TPIX-TW | tpix.net.tw", "=================================================", "b222bfa2d373adb3b9314a52c0f4512b" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "ZHNET-MNT", "ZYS-MNT" ],
    "date_created" : "2025-10-10",
    "date_updated" : "2026-05-02",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-ZS89-RIPE",
    "name" : "zhenyun sun",
    "type" : "OTHER",
    "description" : [ "zhenyun.sun - YunZheng.Space/Network" ],
    "address" : [ "Tartu mnt 67/1-13b, Harjuuma", "10115", "Tallinn", "Estonia" ],
    "street" : "Harjuuma",
    "city" : "Tallinn",
    "zip_code" : "10115",
    "country" : [ "GB" ],
    "phone" : [ "+852-31651702" ],
    "admin_contacts" : [ "ZS2129-RIPE" ],
    "tech_contacts" : [ "ZS2129-RIPE" ],
    "abuse_contacts" : [ "ACRO61962-RIPE" ],
    "languages" : [ "EN", "ZH" ],
    "remarks" : [ "====================================", "====================================", "====================================", "====================================" ],
    "mnt_ref" : [ "ZYS-MNT", "JIANYUELAB-STAFF-MNT" ],
    "mnt_by" : [ "ZYS-MNT" ],
    "date_created" : "2025-10-06",
    "date_updated" : "2026-05-13",
    "source" : "RIPE",
    "addressCountry" : "ESTONIA"
  },
  "administrative_contacts" : [ {
    "handle" : "ZS2129-RIPE",
    "name" : "ZHENYUN SUN",
    "address" : [ "67-1/13b Tartu mnt, Harjumma, Tallinn, Estonia" ],
    "street" : "67-1/13b Tartu Mnt Harjumma",
    "city" : "Tallinn",
    "country" : "ESTONIA",
    "phone" : [ "+852-31651702" ],
    "mnt_by" : [ "ZYS-MNT" ],
    "date_created" : "2025-10-06",
    "date_updated" : "2026-04-27",
    "source" : "RIPE",
    "addressCountry" : "ESTONIA"
  } ],
  "technical_contacts" : [ {
    "handle" : "ZS2129-RIPE",
    "name" : "ZHENYUN SUN",
    "address" : [ "67-1/13b Tartu mnt, Harjumma, Tallinn, Estonia" ],
    "street" : "67-1/13b Tartu Mnt Harjumma",
    "city" : "Tallinn",
    "country" : "ESTONIA",
    "phone" : [ "+852-31651702" ],
    "mnt_by" : [ "ZYS-MNT" ],
    "date_created" : "2025-10-06",
    "date_updated" : "2026-04-27",
    "source" : "RIPE",
    "addressCountry" : "ESTONIA"
  } ]
}

Peers

AS Number	Description	Country
AS58325	Hydra Communications Ltd	GB
AS134823	Sky Digital Co., Ltd.	TW
AS38855	Taiwan Digital Streaming Co.	TW
AS18423	RAID Networks Co., Ltd.	TW
AS10133	Chief Telecom Inc.	TW
AS198250	Reserved AS	NL
AS25369	Hydra Communications Ltd	GB
AS36530	IDC Cube	US

Upstreams

AS Number	Description	Country
AS36530	IDC Cube	US