ASN AS4840 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS4840?

AS4840 is listed under NAP3 at CERNET located in Guangzhou.

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.

AS4840 NAP3 at CERNET located in Guangzhou

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Legacy Routes

NAP3 at CERNET located in Guangzhou cernet.edu.cn

CN 0 Routes

AS Data

AS4840

AS4840 – NAP3 at CERNET located in Guangzhou

AS Number	4840
AS Name	CERNAP3-CN
Organization	NAP3 at CERNET located in Guangzhou
Country	CN
Website	cernet.edu.cn
Number of IPv4 Routes	0
Number of IPv6 Routes	0
ASN type	ISP
Registry	APNIC
Date Allocated	N/A

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Use ASN data for AS4840 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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Raw Whois Response

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS4608 - AS4865'

as-block:       AS4608 - AS4865
descr:          APNIC ASN block
remarks:        These AS numbers are further assigned by APNIC
remarks:        to APNIC members and end-users in the APNIC region
admin-c:        HM20-AP
tech-c:         HM20-AP
mnt-by:         APNIC-HM
mnt-lower:      APNIC-HM
last-modified:  2019-05-20T03:52:26Z
source:         APNIC

role:           APNIC Hostmaster
address:        6 Cordelia Street
address:        South Brisbane
address:        QLD 4101
country:        AU
phone:          +61 7 3858 3100
fax-no:         +61 7 3858 3199
e-mail:         helpdesk@apnic.net
admin-c:        AMS11-AP
tech-c:         AH256-AP
nic-hdl:        HM20-AP
remarks:        Administrator for APNIC
notify:         hostmaster@apnic.net
mnt-by:         MAINT-APNIC-AP
last-modified:  2013-10-23T04:06:51Z
source:         APNIC

% Information related to 'AS4840'

% Abuse contact for 'AS4840' is 'abuse@cernet.edu.cn'

aut-num:        AS4840
as-name:        CERNAP3-CN
descr:          NAP3 at CERNET located in Guangzhou
descr:          USTC, Guangzhou
country:        CN
import:         from AS4538 action pref=10; accept AS4538
import:         from AS4799 action pref=10; accept AS4799
import:         from AS4134 action pref=10; accept AS4134 AS4808 AS4809
import:         from AS7497 action pref=10; accept AS7497
import:         from AS9929 action pref=10; accept AS9929
import:         from AS9389 action pref=10; accept AS9389
import:         from AS9306 action pref=10; accept AS9306
import:         from AS9800 action pref=10; accept AS9800
import:         from AS9808 action pref=10; accept AS9808
export:         to AS4538 announce ANY
export:         to AS4799 announce ANY
export:         to AS4808 announce ANY
export:         to AS7497 announce ANY
export:         to AS9929 announce ANY
export:         to AS9389 announce ANY
export:         to AS9306 announce ANY
export:         to AS9800 announce ANY
export:         to AS9808 announce ANY
default:        to AS4538 action pref=10; networks ANY
remarks:        Exchange Point in Guangzhou
admin-c:        XL1-CN
tech-c:         SZ2-AP
abuse-c:        AC1685-AP
mnt-lower:      MAINT-CERNET-AP
mnt-routes:     MAINT-CERNET-AP
mnt-by:         APNIC-HM
mnt-irt:        IRT-CERNET-AP
last-modified:  2020-09-03T09:16:12Z
source:         APNIC

irt:            IRT-CERNET-AP
address:        Network Center,
address:        FIT-3-220, Tsinghua Univ
address:        Beijing 100084, China
phone:          +86-10-62784301
fax-no:         +86-10-62785933
e-mail:         abuse@cernet.edu.cn
abuse-mailbox:  abuse@cernet.edu.cn
admin-c:        CER-AP
tech-c:         CER-AP
auth:           # Filtered
remarks:        timezone GMT+8
remarks:        abuse@cernet.edu.cn was validated on 2026-03-05
mnt-by:         MAINT-CERNET-AP
last-modified:  2026-03-05T06:39:56Z
source:         APNIC

role:           ABUSE CERNETAP
country:        ZZ
address:        Network Center,
address:        FIT-3-220, Tsinghua Univ
address:        Beijing 100084, China
phone:          +86-10-62784301
e-mail:         abuse@cernet.edu.cn
admin-c:        CER-AP
tech-c:         CER-AP
nic-hdl:        AC1685-AP
remarks:        Generated from irt object IRT-CERNET-AP
remarks:        abuse@cernet.edu.cn was validated on 2026-03-05
abuse-mailbox:  abuse@cernet.edu.cn
mnt-by:         APNIC-ABUSE
last-modified:  2026-03-05T06:40:20Z
source:         APNIC

person:         Shuang Zhu
address:        China Education and Research Network Information Center
address:        Room 225, Main Building, Tsinghua University
address:        Beijing 100084, China
country:        CN
phone:          +86-10-6278-5931
fax-no:         +86-10-6278-5933
e-mail:         szhu@cernet.edu.cn
nic-hdl:        SZ2-AP
mnt-by:         MAINT-CERNET-AP
last-modified:  2011-12-22T05:14:36Z
source:         APNIC

person:         Xing Li
address:        China Education and Research Network Center
address:        Room 225, Main Building, Tsinghua University
address:        Beijing 100084
address:        CN
country:        CN
phone:          +86-10-6278-5983
fax-no:         +86-10-6278-5933
e-mail:         xing@cernet.edu.cn
nic-hdl:        XL1-CN
mnt-by:         MAINT-CERNET-AP
last-modified:  2011-12-22T05:14:25Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.34 (WHOIS-US2)

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.apnic.net",
  "as_blocks" : [ {
    "as_block" : "AS4608 - AS4865",
    "description" : [ "APNIC ASN block" ],
    "admin_contacts" : [ "HM20-AP" ],
    "tech_contacts" : [ "HM20-AP" ],
    "remarks" : [ "These AS numbers are further assigned by APNIC", "to APNIC members and end-users in the APNIC region" ],
    "mnt_by" : [ "APNIC-HM" ],
    "mnt_lower" : [ "APNIC-HM" ],
    "date_updated" : "2019-05-20",
    "source" : "APNIC"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS4840",
    "as_name" : "CERNAP3-CN",
    "description" : [ "NAP3 at CERNET located in Guangzhou", "USTC, Guangzhou" ],
    "country" : "CN",
    "import" : [ "from AS4538 action pref=10; accept AS4538", "from AS4799 action pref=10; accept AS4799", "from AS4134 action pref=10; accept AS4134 AS4808 AS4809", "from AS7497 action pref=10; accept AS7497", "from AS9929 action pref=10; accept AS9929", "from AS9389 action pref=10; accept AS9389", "from AS9306 action pref=10; accept AS9306", "from AS9800 action pref=10; accept AS9800", "from AS9808 action pref=10; accept AS9808" ],
    "export" : [ "to AS4538 announce ANY", "to AS4799 announce ANY", "to AS4808 announce ANY", "to AS7497 announce ANY", "to AS9929 announce ANY", "to AS9389 announce ANY", "to AS9306 announce ANY", "to AS9800 announce ANY", "to AS9808 announce ANY" ],
    "default" : [ "to AS4538 action pref=10; networks ANY" ],
    "admin_contacts" : [ "XL1-CN" ],
    "tech_contacts" : [ "SZ2-AP" ],
    "abuse_contacts" : [ "AC1685-AP" ],
    "remarks" : [ "Exchange Point in Guangzhou" ],
    "mnt_irt" : [ "IRT-CERNET-AP" ],
    "mnt_lower" : [ "MAINT-CERNET-AP" ],
    "mnt_routes" : [ "MAINT-CERNET-AP" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2020-09-03",
    "source" : "APNIC"
  } ],
  "irt" : {
    "handle" : "IRT-CERNET-AP",
    "address" : [ "Network Center,", "FIT-3-220, Tsinghua Univ", "Beijing 100084, China" ],
    "city" : "Beijing",
    "zip_code" : "100084",
    "country" : "CHINA",
    "email" : [ "abuse@cernet.edu.cn" ],
    "abuse_mailbox" : [ "abuse@cernet.edu.cn" ],
    "phone" : [ "+86-10-62784301" ],
    "fax_no" : [ "+86-10-62785933" ],
    "admin_contacts" : [ "CER-AP" ],
    "tech_contacts" : [ "CER-AP" ],
    "remarks" : [ "timezone GMT+8", "abuse@cernet.edu.cn was validated on 2026-03-05" ],
    "mnt_by" : [ "MAINT-CERNET-AP" ],
    "date_updated" : "2026-03-05",
    "source" : "APNIC"
  },
  "administrative_contacts" : [ {
    "handle" : "XL1-CN",
    "name" : "Xing Li",
    "address" : [ "China Education and Research Network Center", "Room 225, Main Building, Tsinghua University", "Beijing 100084", "CN" ],
    "city" : "Beijing",
    "zip_code" : "100084",
    "country" : "CN",
    "email" : [ "xing@cernet.edu.cn" ],
    "phone" : [ "+86-10-6278-5983" ],
    "fax_no" : [ "+86-10-6278-5933" ],
    "mnt_by" : [ "MAINT-CERNET-AP" ],
    "date_updated" : "2011-12-22",
    "source" : "APNIC",
    "addressCountry" : "CN"
  } ],
  "technical_contacts" : [ {
    "handle" : "SZ2-AP",
    "name" : "Shuang Zhu",
    "address" : [ "China Education and Research Network Information Center", "Room 225, Main Building, Tsinghua University", "Beijing 100084, China" ],
    "city" : "Beijing",
    "zip_code" : "100084",
    "country" : "CN",
    "email" : [ "szhu@cernet.edu.cn" ],
    "phone" : [ "+86-10-6278-5931" ],
    "fax_no" : [ "+86-10-6278-5933" ],
    "mnt_by" : [ "MAINT-CERNET-AP" ],
    "date_updated" : "2011-12-22",
    "source" : "APNIC",
    "addressCountry" : "CHINA"
  } ],
  "abuse_contacts" : [ {
    "handle" : "AC1685-AP",
    "name" : "ABUSE CERNETAP",
    "address" : [ "Network Center,", "FIT-3-220, Tsinghua Univ", "Beijing 100084, China" ],
    "city" : "Beijing",
    "zip_code" : "100084",
    "country" : "ZZ",
    "email" : [ "abuse@cernet.edu.cn" ],
    "abuse_mailbox" : [ "abuse@cernet.edu.cn" ],
    "phone" : [ "+86-10-62784301" ],
    "admin_contacts" : [ "CER-AP" ],
    "tech_contacts" : [ "CER-AP" ],
    "remarks" : [ "Generated from irt object IRT-CERNET-AP", "abuse@cernet.edu.cn was validated on 2026-03-05" ],
    "mnt_by" : [ "APNIC-ABUSE" ],
    "date_updated" : "2026-03-05",
    "source" : "APNIC",
    "addressCountry" : "CHINA"
  } ]
}

Peers

AS Number	Description	Country
AS9808	China Mobile	CN
AS9800	CHINA UNICOM	CN
AS9389	BEIJING SHENZHOU GREATWALL COMMUNICATION	CN
AS4799	CNCGROUP Jitong IP network	CN
AS9929	CHINA UNICOM Industrial Internet Backbone	CN
AS4538	Tsinghua University	CN
AS4808	CHINA169 BJ China Unicom Beijing Province Network	AU
AS4134	CHINANET BACKBONE No.31,Jin rong Street	CN
AS7497	CNIC CAS	CN
AS9306	CIETNET RongHua Road No.11, Beijing Economy Technology Development Area, 100176	AU