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:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        JY50-AP
tech-c:         EN211-AP
auth:           # Filtered
remarks:        [email protected] 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:         [email protected]
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:         [email protected]
admin-c:        JY50-AP
tech-c:         EN211-AP
nic-hdl:        AS2092-AP
remarks:        Generated from irt object IRT-SMARTMOBILE-HK
remarks:        [email protected] was validated on 2025-08-27
abuse-mailbox:  [email protected]
mnt-by:         APNIC-ABUSE
last-modified:  2025-08-27T00:45:01Z
source:         APNIC

person:         Eric Chan
nic-hdl:        EC9-AP
e-mail:         [email protected]
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:         [email protected]
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
121.203.245.3	AS17924 SmarTone Mobile Communications Ltd	`1.60ms` from Hong Kong, HK
121.203.246.3	AS17924 SmarTone Mobile Communications Ltd	`1.28ms` from Hong Kong, HK
121.203.244.3	AS17924 SmarTone Mobile Communications Ltd	`2.27ms` 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
185.173.22.85	AS12859 BIT BV	`1.11ms` from Amsterdam, NL
76.120.217.117	AS7922 Comcast Cable Communications, LLC	`6.70ms` from Ashburn, US
20.124.68.213	AS8075 Microsoft Corporation	`0.37ms` from Ashburn, US
99.127.199.5	AS7018 AT&T Enterprises, LLC	`14.21ms` from Atlanta, US
180.180.129.21	AS23969 TOT Public Company Limited	`1.36ms` from Bangkok, TH
14.192.17.117	AS132717 NxtGen Datacenter & Cloud Technologies Pvt. Ltd.	`4.39ms` from Bengaluru, IN
57.138.51.69	AS30029 Dobson Technologies - Transport and Telecom Solutions, LLC	`6.47ms` from Dallas, US
209.58.153.5	AS394380 Leaseweb USA, Inc.	`0.26ms` from Dallas, US
103.129.3.245	AS136328 S S Cablenet	`13.72ms` from Dhaka, BD
90.205.55.5	AS5607 Sky UK Limited	`5.31ms` from Erith, GB
140.105.222.53	AS137 Consortium GARR	`7.25ms` from Milan, IT
120.195.89.181	AS56046 China Mobile communications corporation	`3.32ms` from Nanjing, CN
20.214.231.245	AS8075 Microsoft Corporation	`0.79ms` from Seoul, KR
180.131.212.37	AS55900 GLBB Japan KK	`0.42ms` from Tokyo, JP
195.3.96.101	AS8447 A1 Telekom Austria AG	`0.35ms` from Vienna, AT
14.245.160.101	AS45899 VNPT Corp	`0.78ms` from Da Nang, VN
52.117.60.101	AS36351 IBM Cloud	`1.20ms` from Dallas, US
97.176.133.69	AS6167 Verizon Business	`13.73ms` from Dallas, US
213.76.119.197	AS5617 Orange Polska Spolka Akcyjna	`1.02ms` from Gdansk, PL
43.138.250.149	AS45090 Shenzhen Tencent Computer Systems Company Limited	`2.00ms` from Guangzhou, CN
212.226.146.101	AS719 Elisa Oyj	`0.63ms` from Helsinki, FI
23.206.203.53	AS20940 Akamai International B.V.	`0.52ms` from Hong Kong, HK
211.198.76.245	AS4766 Korea Telecom	`0.95ms` from Incheon, KR
13.41.107.229	AS16509 Amazon.com, Inc.	`0.18ms` from London, GB
138.4.79.229	AS766 RedIRIS Autonomous System	`0.67ms` from Madrid, ES

Traceroute

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

traceroute -a -n -q1 -f4 121.203.245.3

traceroute to 121.203.245.3 (121.203.245.3): 64 hops max, 52 byte packets

4 [] 103.203.158.175 1.456 ms

5 [AS9304] 218.189.5.21 1.38 ms

6 [AS9304] 218.189.25.230 1.84 ms

7 [AS17924] 203.78.42.165 1.717 ms

8 [AS17924] 203.78.42.65 1.703 ms

9 [AS17924] 121.203.245.3 1.714 ms

Measurement taken from

IPinfo ProbeNet in Hong Kong, HK

On January 30th 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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