123.255.96.0/19

AS4641  ·  The Hong Kong Internet Exchange Limited

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Summary

Country Hong Kong
Domain cuhk.edu.hk
ASN AS4641
Registry APNIC
ID CUHKNET

WHOIS Details

inetnum:        123.255.96.0 - 123.255.127.255
netname:        CUHKNET
descr:          Information Technology Services Centre
descr:          The Chinese University of Hong Kong
country:        HK
org:            ORG-CUOH1-AP
admin-c:        NA17-AP
tech-c:         NT27-AP
abuse-c:        AC2019-AP
status:         ALLOCATED PORTABLE
remarks:        --------------------------------------------------------
remarks:        To report network abuse, please contact mnt-irt
remarks:        For troubleshooting, please contact tech-c and admin-c
remarks:        Report invalid contact via www.apnic.net/invalidcontact
remarks:        --------------------------------------------------------
mnt-by:         APNIC-HM
mnt-lower:      MAINT-CUHKNET-HK
mnt-routes:     MAINT-CUHKNET-HK
mnt-irt:        IRT-CUHKNET-HK
last-modified:  2022-12-05T02:41:47Z
source:         APNIC

irt:            IRT-CUHKNET-HK
address:        Information Technology Services Centre,
address:        The Chinese University of Hong Kong,
address:        Shatin, N.T.
address:        Hong Kong
e-mail:         noc-admin@cuhk.edu.hk
abuse-mailbox:  noc-admin@cuhk.edu.hk
admin-c:        NA17-AP
tech-c:         NT27-AP
auth:           # Filtered
remarks:        noc-admin@cuhk.edu.hk was validated on 2025-11-12
mnt-by:         MAINT-CUHKNET-HK
last-modified:  2025-11-18T00:26:31Z
source:         APNIC

organisation:   ORG-CUOH1-AP
org-name:       The Chinese University of Hong Kong
org-type:       LIR
country:        HK
address:        Information Technology Service Centre
address:        G/F., Pi-Chiu Building
phone:          +852-3943-8848
fax-no:         +852-2603-5001
e-mail:         noc-admin@cuhk.edu.hk
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:42Z
source:         APNIC

role:           ABUSE CUHKNETHK
country:        ZZ
address:        Information Technology Services Centre,
address:        The Chinese University of Hong Kong,
address:        Shatin, N.T.
address:        Hong Kong
phone:          +000000000
e-mail:         noc-admin@cuhk.edu.hk
admin-c:        NA17-AP
tech-c:         NT27-AP
nic-hdl:        AC2019-AP
remarks:        Generated from irt object IRT-CUHKNET-HK
remarks:        noc-admin@cuhk.edu.hk was validated on 2025-11-12
abuse-mailbox:  noc-admin@cuhk.edu.hk
mnt-by:         APNIC-ABUSE
last-modified:  2025-11-12T01:03:41Z
source:         APNIC

person:         Network Administration Contact
address:        Information Technology Services Centre,
address:        The Chinese University of Hong Kong,
address:        Shatin, N.T.
address:        Hong Kong
country:        HK
phone:          +852-3943-8830
fax-no:         +852-2603-5001
e-mail:         noc-admin@cuhk.edu.hk
nic-hdl:        NA17-AP
notify:         noc-admin@cuhk.edu.hk
mnt-by:         MAINT-CUHKNET-HK
last-modified:  2012-09-19T01:45:32Z
source:         APNIC

person:         Network Technical Contact
address:        Information Technology Services Centre,
address:        The Chinese University of Hong Kong,
address:        Shatin, N.T.
address:        Hong Kong
country:        HK
phone:          +852-3943-8830
fax-no:         +852-2603-5001
e-mail:         noc-tech@cuhk.edu.hk
nic-hdl:        NT27-AP
notify:         noc-tech@cuhk.edu.hk
mnt-by:         MAINT-CUHKNET-HK
last-modified:  2012-09-19T01:46:08Z
source:         APNIC

route:          123.255.96.0/19
descr:          The Chinese University of Hong Kong
origin:         AS4641
mnt-lower:      MAINT-CUHKNET-HK
mnt-routes:     MAINT-CUHKNET-HK
mnt-by:         MAINT-CUHKNET-HK
last-modified:  2011-05-20T07:00:59Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 123.255.0.0/16

Range ASN Company Num of IPs
123.255.0.0/18 AS23655 2degrees 16,384
123.255.128.0/18 AS9374 EDION Corporation 16,384
123.255.200.0/21 AS24521 PT Data Utama Dinamika 2,048
123.255.240.0/21 AS10001 Mics Network Corporation 2,048
123.255.192.0/21 AS17698 COMMUNITY NETWORK CENTER INC. 2,048
123.255.232.0/21 AS24259 kanuma cable television Corporation 2,048
123.255.202.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.203.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.204.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.205.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.206.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.207.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.13.0/24 AS38084 Static Allocation to Netspeed 256
123.255.230.0/24 AS45560 SPLUNKNET-PH 256
123.255.231.0/24 AS45560 SPLUNKNET-PH 256
123.255.201.0/24 AS24521 DATAUTAMA-NET-ID 256
123.255.200.0/24 AS24521 DATAUTAMA-NET-ID 256

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity

Pingable IPs

6 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
123.255.111.252 AS4641 The Hong Kong Internet Exchange Limited 1.59ms from Hong Kong, HK
123.255.103.252 AS4641 The Hong Kong Internet Exchange Limited 1.50ms from Hong Kong, HK

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address ASN Details
168.100.148.67 AS140577 Ahrefs Pte Ltd 0.23ms from Ashburn, US
199.5.196.3 AS396192 South Jersey Transportation Authority 5.38ms from Ashburn, US
98.252.201.147 AS7922 Comcast Cable Communications, LLC 4.43ms from Atlanta, US
52.35.214.67 AS16509 Amazon.com, Inc. 0.14ms from Boardman, US
86.146.136.195 AS2856 British Telecommunications PLC 2.96ms from Erith, GB
14.186.90.83 AS45899 VNPT Corp 1.66ms from Ho Chi Minh City, VN
27.64.135.147 AS7552 Viettel Group 3.38ms from Ho Chi Minh City, VN
1.181.57.19 AS4134 CHINANET-BACKBONE 11.26ms from Hohhot, CN
124.50.126.3 AS17858 LG POWERCOMM 1.91ms from Incheon, KR
114.207.98.179 AS9318 SK Broadband Co Ltd 1.77ms from Incheon, KR
23.126.157.147 AS7018 AT&T Enterprises, LLC 4.67ms from Los Angeles, US
201.225.225.227 AS11556 Cable & Wireless Panama 0.57ms from Panama, PA
83.206.173.211 AS3215 Orange S.A. 16.31ms from Paris, FR
139.218.54.147 AS9443 Vocus Retail 4.32ms from Sydney, AU
133.27.18.35 AS38635 Keio University 3.28ms from Tokyo, JP
20.200.126.67 AS8075 Microsoft Corporation 0.37ms from Toronto, CA
20.242.77.99 AS8075 Microsoft Corporation 0.27ms from Boydton, US
193.58.156.131 AS2611 BELNET 2.33ms from Brussels, BE
186.153.135.99 AS7303 Telecom Argentina S.A. 1.30ms from Buenos Aires, AR
216.250.239.3 AS398300 OCIENT INC 0.49ms from Chicago, US
129.79.100.35 AS87 Indiana University 5.29ms from Chicago, US
187.49.129.163 AS28145 RLINE TELECOM LTDA 11.81ms from Curitiba, BR
109.250.208.51 AS8881 1&1 Versatel GmbH 3.90ms from Duesseldorf, DE
76.139.218.115 AS7922 Comcast Cable Communications, LLC 8.80ms from Flint, US
119.189.151.179 AS4837 CHINA UNICOM China169 Backbone 7.81ms from Jinan, CN

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

$
traceroute -a -n -q1 -f3 -m7 123.255.124.63
traceroute to 123.255.124.63 (123.255.124.63): 7 hops max, 52 byte packets
5 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Saskatoon, CA
On

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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