ASN AS18420 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS18420?

AS18420 is listed under National Central University.

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?

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AS18420 National Central University

ASN Lookup Tool

National Central University twnic.net.tw

TW 1 Routes

AS Data

AS18420

AS18420 – National Central University

AS Number	18420
AS Name	NCU-TW
Organization	National Central University()
Country	TW
Website	twnic.net.tw
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	EDUCATION
Registry	APNIC
Date Allocated	N/A

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
140.115.0.0/16	AS18420	National Central University	Ministry of Education Computer Center	65536

Raw Whois Response

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

% Information related to 'AS17653 - AS18431'

as-block:       AS17653 - AS18431
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:  2019-01-08T23:19:07Z
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 'AS18410 - AS18429'

as-block:       AS18410 - AS18429
descr:          TWNIC-TW-AS-BLOCK8
remarks:        These AS numbers are further assigned by TWNIC
remarks:        to TWNIC members
admin-c:        TWA2-AP
tech-c:         TWA2-AP
mnt-by:         MAINT-TW-TWNIC
mnt-lower:      MAINT-TW-TWNIC
last-modified:  2008-09-04T06:40:26Z
source:         APNIC

role:           TWNIC Whois Administrator
address:        Taiwan Network Information Center
address:        3F., No. 123, Sec. 4, Bade Rd., Songshan Dist.,
address:        Taipei, Taiwan, 105
country:        TW
phone:          +886-2-25289696
fax-no:         +886-2-25287756
e-mail:         hostmaster@twnic.net.tw
admin-c:        ck373-AP
tech-c:         TW922-AP
tech-c:         NS10-AP
nic-hdl:        TWA2-AP
notify:         hostmaster@twnic.net.tw
mnt-by:         MAINT-TW-TWNIC
last-modified:  2020-01-02T03:54:20Z
source:         APNIC

% Information related to 'AS18420'

% Abuse contact for 'AS18420' is 'noc@mail.moe.gov.tw'

aut-num:        AS18420
as-name:        NCU-TW
descr:          National Central University
descr:          No.300, Jungda Rd, Jhongli City,
descr:          Taoyuan
country:        TW
import:         from AS3462 action pref=100; accept ANY
import:         from AS9676 action pref=100; accept ANY
import:         from AS18182 action pref=100; accept ANY
export:         to AS3462 announce AS18420
export:         to AS9676 announce AS18420
export:         to AS18182 announce AS18420
default:        to AS1659 action pref=10; networks ANY
admin-c:        CL184-AP
tech-c:         SY81-AP
abuse-c:        AT939-AP
notify:         center7@cc.ncu.edu.tw
mnt-by:         MAINT-TW-TWNIC
mnt-irt:        IRT-TANET-TW
last-modified:  2025-11-06T09:25:57Z
source:         APNIC

irt:            IRT-TANET-TW
address:        Ministry of Education computer Center
address:        12F, No 106, Sec. 2, Heping E. Rd., Taipei
e-mail:         noc@mail.moe.gov.tw
abuse-mailbox:  noc@mail.moe.gov.tw
admin-c:        TWA2-AP
tech-c:         TWA2-AP
auth:           # Filtered
mnt-by:         MAINT-TW-TWNIC
last-modified:  2025-11-06T07:51:48Z
source:         APNIC

role:           ABUSE TWNICAP
country:        ZZ
address:        3F., No. 123, Sec. 4, Bade Rd., Songshan Dist., Taipei 105, Taiwan
phone:          +000000000
e-mail:         hostmaster@twnic.tw
admin-c:        TWA2-AP
tech-c:         TWA2-AP
nic-hdl:        AT939-AP
remarks:        Generated from irt object IRT-TWNIC-AP
remarks:        hostmaster@twnic.tw was validated on 2025-05-23
abuse-mailbox:  hostmaster@twnic.tw
mnt-by:         APNIC-ABUSE
last-modified:  2025-05-23T00:02:10Z
source:         APNIC

person:         CHIU-MEI LIU
nic-hdl:        CL184-AP
e-mail:         center6@cc.ncu.edu.tw
address:        No.300, Jungda Rd, Jhongli City
address:        Taoyuan, 320, R.O.C
phone:          +886-3-422-7151 ext 7512
fax-no:         +886-3-425-2561
country:        TW
mnt-by:         MAINT-TW-TWNIC
last-modified:  2025-08-28T08:31:39Z
source:         APNIC
remarks:        (hid:CL352-TW)

person:         SU-CHIU YANG
nic-hdl:        SY81-AP
e-mail:         center7@cc.ncu.edu.tw
address:        No.300, Jungda Rd, Jhongli City
address:        Taoyuan, 320, R.O.C
phone:          +886-3-422-7151 ext. 7505
fax-no:         +886-3-425-2561
country:        TW
mnt-by:         MAINT-TW-TWNIC
last-modified:  2025-08-28T08:31:42Z
source:         APNIC
remarks:        (hid:HCY1-TW)

% 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" : "AS17653 - AS18431",
    "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" : "2019-01-08",
    "source" : "APNIC"
  }, {
    "as_block" : "AS18410 - AS18429",
    "description" : [ "TWNIC-TW-AS-BLOCK8" ],
    "admin_contacts" : [ "TWA2-AP" ],
    "tech_contacts" : [ "TWA2-AP" ],
    "remarks" : [ "These AS numbers are further assigned by TWNIC", "to TWNIC members" ],
    "mnt_by" : [ "MAINT-TW-TWNIC" ],
    "mnt_lower" : [ "MAINT-TW-TWNIC" ],
    "date_updated" : "2008-09-04",
    "source" : "APNIC"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS18420",
    "as_name" : "NCU-TW",
    "description" : [ "National Central University", "No.300, Jungda Rd, Jhongli City,", "Taoyuan" ],
    "country" : "TW",
    "import" : [ "from AS3462 action pref=100; accept ANY", "from AS9676 action pref=100; accept ANY", "from AS18182 action pref=100; accept ANY" ],
    "export" : [ "to AS3462 announce AS18420", "to AS9676 announce AS18420", "to AS18182 announce AS18420" ],
    "default" : [ "to AS1659 action pref=10; networks ANY" ],
    "admin_contacts" : [ "CL184-AP" ],
    "tech_contacts" : [ "SY81-AP" ],
    "abuse_contacts" : [ "AT939-AP" ],
    "notify" : [ "center7@cc.ncu.edu.tw" ],
    "mnt_irt" : [ "IRT-TANET-TW" ],
    "mnt_by" : [ "MAINT-TW-TWNIC" ],
    "date_updated" : "2025-11-06",
    "source" : "APNIC"
  } ],
  "irt" : {
    "handle" : "IRT-TANET-TW",
    "address" : [ "Ministry of Education computer Center", "12F, No 106, Sec. 2, Heping E. Rd., Taipei" ],
    "street" : "No 106 Sec. 2 Heping E. Rd.",
    "city" : "Taipei",
    "email" : [ "noc@mail.moe.gov.tw" ],
    "abuse_mailbox" : [ "noc@mail.moe.gov.tw" ],
    "admin_contacts" : [ "TWA2-AP" ],
    "tech_contacts" : [ "TWA2-AP" ],
    "mnt_by" : [ "MAINT-TW-TWNIC" ],
    "date_updated" : "2025-11-06",
    "source" : "APNIC"
  },
  "administrative_contacts" : [ {
    "handle" : "CL184-AP",
    "name" : "CHIU-MEI LIU",
    "address" : [ "No.300, Jungda Rd, Jhongli City", "Taoyuan, 320, R.O.C" ],
    "street" : "Jungda Rd Jhongli City",
    "city" : "Taoyuan",
    "zip_code" : "320",
    "country" : "TW",
    "email" : [ "center6@cc.ncu.edu.tw" ],
    "phone" : [ "+886-3-422-7151 ext 7512" ],
    "fax_no" : [ "+886-3-425-2561" ],
    "remarks" : [ "(hid:CL352-TW)" ],
    "mnt_by" : [ "MAINT-TW-TWNIC" ],
    "date_updated" : "2025-08-28",
    "source" : "APNIC",
    "addressCountry" : "R.O.C"
  } ],
  "technical_contacts" : [ {
    "handle" : "SY81-AP",
    "name" : "SU-CHIU YANG",
    "address" : [ "No.300, Jungda Rd, Jhongli City", "Taoyuan, 320, R.O.C" ],
    "street" : "Jungda Rd Jhongli City",
    "city" : "Taoyuan",
    "zip_code" : "320",
    "country" : "TW",
    "email" : [ "center7@cc.ncu.edu.tw" ],
    "phone" : [ "+886-3-422-7151 ext. 7505" ],
    "fax_no" : [ "+886-3-425-2561" ],
    "remarks" : [ "(hid:HCY1-TW)" ],
    "mnt_by" : [ "MAINT-TW-TWNIC" ],
    "date_updated" : "2025-08-28",
    "source" : "APNIC",
    "addressCountry" : "R.O.C"
  } ],
  "abuse_contacts" : [ {
    "handle" : "AT939-AP",
    "name" : "ABUSE TWNICAP",
    "address" : [ "3F., No. 123, Sec. 4, Bade Rd., Songshan Dist., Taipei 105, Taiwan" ],
    "street" : "Sec. 4 Bade Rd.",
    "city" : "Taipei",
    "zip_code" : "105",
    "country" : "ZZ",
    "email" : [ "hostmaster@twnic.tw" ],
    "abuse_mailbox" : [ "hostmaster@twnic.tw" ],
    "phone" : [ "+000000000" ],
    "admin_contacts" : [ "TWA2-AP" ],
    "tech_contacts" : [ "TWA2-AP" ],
    "remarks" : [ "Generated from irt object IRT-TWNIC-AP", "hostmaster@twnic.tw was validated on 2025-05-23" ],
    "mnt_by" : [ "APNIC-ABUSE" ],
    "date_updated" : "2025-05-23",
    "source" : "APNIC",
    "addressCountry" : "TAIWAN"
  } ]
}

Peers

AS Number	Description	Country
AS7539	National Center for High performance Computing	TW
AS18182	Sony Network Taiwan Limited	TW
AS18185	4F, No.114, Sec.1, Chung-Shiao W. Road	TW
AS3462	Chunghwa Telecom Co., Ltd.	TW
AS18185	NTCU AS TW 4F, No.114, Sec.1, Chung Shiao W. Road	AU
AS9676	SaveCom Internation Inc.	TW
AS7539	National Center for High-performance Computing	TW