121.203.240.0/21

AS17924 · SmarTone Mobile Communications Ltd

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Summary

Country	Hong Kong
Domain	smartone.com
ASN	AS17924
Parent Range	121.202.0.0/15
Registry	APNIC
ID	SMARTONE-MB

WHOIS Details

inetnum:        121.202.0.0 - 121.203.255.255
netname:        SMARTONE-MB
descr:          SmarTone Mobile Communications Ltd
descr:          Hong Kong
country:        HK
org:            ORG-SMCL2-AP
admin-c:        JY50-AP
tech-c:         EC9-AP
abuse-c:        AS2092-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-HK-SMARTM-AP
mnt-routes:     MAINT-HK-SMARTM-AP
mnt-irt:        IRT-SMARTMOBILE-HK
last-modified:  2020-05-16T06:32:37Z
source:         APNIC

irt:            IRT-SMARTMOBILE-HK
address:        31/F, Millennium City 2,
address:        378 Kwun Tong Road, Kwun Tong,
address:        Kowloon, Hong Kong
e-mail:         abuse@ismart.net
abuse-mailbox:  abuse@ismart.net
admin-c:        JY50-AP
tech-c:         EN211-AP
auth:           # Filtered
remarks:        abuse@ismart.net was validated on 2025-08-27
mnt-by:         MAINT-HK-SMARTM-AP
last-modified:  2025-11-17T23:08:35Z
source:         APNIC

organisation:   ORG-SMCL2-AP
org-name:       Smartone Mobile communications Limited
org-type:       LIR
country:        HK
address:        31 / F , Millennium City 2
address:        378 Kwun Tong Road, Kwun Tong, Kowloon
phone:          +852-31282828
fax-no:         +852-25976556
e-mail:         abuse@ismart.net
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:50Z
source:         APNIC

role:           ABUSE SMARTMOBILEHK
country:        ZZ
address:        31/F, Millennium City 2,
address:        378 Kwun Tong Road, Kwun Tong,
address:        Kowloon, Hong Kong
phone:          +000000000
e-mail:         abuse@ismart.net
admin-c:        JY50-AP
tech-c:         EN211-AP
nic-hdl:        AS2092-AP
remarks:        Generated from irt object IRT-SMARTMOBILE-HK
remarks:        abuse@ismart.net was validated on 2025-08-27
abuse-mailbox:  abuse@ismart.net
mnt-by:         APNIC-ABUSE
last-modified:  2025-08-27T00:45:01Z
source:         APNIC

person:         Eric Chan
nic-hdl:        EC9-AP
e-mail:         ericchan@ismart.net
address:        31/F,Millennium City 2,
address:        378 Kwun Tong Road, Kwun Tong,
address:        Kowloon, Hong Kong
phone:          +852-31282298
fax-no:         +852-21683089
country:        HK
mnt-by:         MAINT-HK-EC9-AP
last-modified:  2009-12-09T10:21:18Z
source:         APNIC

person:         Johnny Yeung
nic-hdl:        JY50-AP
e-mail:         johnnyyeung@ismart.net
address:        31/F, Millennium City 2,
address:        378 Kwun Tong Road, Kwun Tong,
address:        Kowloon, Hong Kong
phone:          +852-28802618
fax-no:         +852-21683089
country:        HK
mnt-by:         MAINT-HK-JY50-AP
last-modified:  2009-12-09T08:10:00Z
source:         APNIC

route:          121.202.0.0/15
origin:         AS17924
descr:          Smartone Mobile communications Limited 31 / F , Millennium City 2 378 Kwun Tong Road, Kwun Tong, Kowloon
mnt-by:         MAINT-HK-SMARTM-AP
last-modified:  2021-04-22T07:22:28Z
source:         APNIC

Overlapping Ranges

BGP prefixes that contain 121.203.240.0/21

Range	ASN	Company	Num of IPs
121.202.0.0/15	AS17924	SmarTone Mobile Communications Ltd	131,072

Nearby Ranges

BGP prefixes that overlap with 121.203.0.0/16

Range	ASN	Company	Num of IPs
121.202.0.0/15	AS17924	SmarTone Mobile Communications Ltd	131,072

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

Read more

Pingable IPs

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

IP Address	ASN	Details
121.203.244.3	AS17924 SmarTone Mobile Communications Ltd	`2.23ms` from Hong Kong, HK
121.203.245.3	AS17924 SmarTone Mobile Communications Ltd	`1.56ms` from Hong Kong, HK
121.203.246.3	AS17924 SmarTone Mobile Communications Ltd	`1.17ms` 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
68.1.125.181	AS22773 Cox Communications Inc.	`18.19ms` from Atlanta, US
212.146.79.133	AS5606 GTS Telecom SRL	`0.62ms` from Bucharest, RO
113.218.141.53	AS4134 CHINANET-BACKBONE	`2.02ms` from Changsha, CN
131.189.104.181	AS8075 Microsoft Corporation	`0.32ms` from Frankfurt am Main, DE
167.248.1.149	AS15108 Allo Communications LLC	`4.27ms` from Lincoln, US
86.134.179.181	AS2856 British Telecommunications PLC	`2.31ms` from London, GB
178.185.194.133	AS12389 PJSC Rostelecom	`16.20ms` from Moscow, RU
133.17.213.37	AS2907 Research Organization of Information and Systems, National Institute of Informatics	`12.50ms` from Osaka, JP
18.210.140.117	AS14618 Amazon.com, Inc.	`0.21ms` from Reston, US
36.154.219.21	AS56046 China Mobile communications corporation	`3.65ms` from Suzhou, CN
143.179.21.197	AS50266 Odido Netherlands B.V.	`5.69ms` from Amsterdam, NL
68.34.37.21	AS7922 Comcast Cable Communications, LLC	`13.38ms` from Detroit, US
187.58.70.5	AS18881 TELEFÔNICA BRASIL S.A	`0.64ms` from Fortaleza, BR
125.176.125.69	AS17858 LG POWERCOMM	`1.83ms` from Incheon, KR
195.155.129.181	AS43352 Teletek Bulut Bilisim ve Iletisim Hizmetleri A.S.	`6.40ms` from Istanbul, TR
112.6.144.133	AS24444 Shandong Mobile Communication Company Limited	`0.73ms` from Jinan, CN
86.38.185.101	AS262287 Latitude.sh LTDA	`0.09ms` from Miami, US
201.152.181.181	AS8151 UNINET	`7.38ms` from Monterrey, MX
69.248.146.197	AS7922 Comcast Cable Communications, LLC	`6.58ms` from New York City, US
128.134.89.149	AS4766 Korea Telecom	`10.04ms` from Seoul, KR
136.163.252.149	AS197425 Saab AB	`11.73ms` from Stockholm, SE
120.154.77.229	AS1221 Telstra Limited	`1.64ms` from Sydney, AU
141.236.173.165	AS5972 United States Department of Defense (DoD)	`2.94ms` from Tokyo, JP
157.97.33.53	AS15817 Mittwald CM Service GmbH und Co. KG	`3.20ms` from Hamburg, DE
218.91.240.101	AS4134 CHINANET-BACKBONE	`6.28ms` from Huai'an, CN

Traceroute

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

traceroute -a -n -q1 -f6 -m9 121.203.241.72

traceroute to 121.203.241.72 (121.203.241.72): 9 hops max, 52 byte packets

6 [AS3356] 4.14.14.157 0.852 ms

7 *

8 *

9 *

Measurement taken from

IPinfo ProbeNet in Chicago, US

On February 7th 2026

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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