128.121.42.0/23

AS3949 · NTT America, Inc.

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Summary

Country	unknown
Domain
ASN	AS3949
Parent Range	128.121.0.0/16
Registry	RWHOIS
ID	NETBLK-128-121-42-0.127.0.0.1/32,NETBLK-128-121-42-0

WHOIS Details

No whois details available for this network

Overlapping Ranges

BGP prefixes that contain 128.121.42.0/23

Range	ASN	Company	Num of IPs
128.121.0.0/16	AS2914	NTT America, Inc.	65,536

Nearby Ranges

BGP prefixes that overlap with 128.121.0.0/16

Range	ASN	Company	Num of IPs
128.121.0.0/16	AS2914	NTT America, Inc.	65,536
128.121.128.0/17	AS203020	NTT DATA	32,768
128.121.64.0/18	AS6079	RACKDOG	16,384
128.121.64.0/18	AS7029	RACKDOG	16,384
128.121.0.0/22	AS3949		1,024
128.121.11.0/24	AS204670	NTT Com - Mitsubishi Corporation	256
128.121.15.0/24	AS204670	Quinstreet Inc	256

Hosted domains

There is 1 domain name hosted across 1 IP address on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
128.121.42.38	coursecomment.com	1

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

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Pingable IPs

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

IP Address	ASN	Details
128.121.42.4	AS3949 NTT America, Inc.	`24.88ms` from Frankfurt am Main, DE

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
75.189.221.199	AS11426 Charter Communications Inc	`9.78ms` from Charlotte, US
104.169.149.87	AS5650 Frontier Communications of America, Inc.	`16.36ms` from Chicago, US
122.172.6.199	AS24560 Bharti Airtel Ltd., Telemedia Services	`6.26ms` from Delhi, IN
217.10.11.231	AS25538 Internet Ulm/Neu-Ulm e.V.	`4.96ms` from Frankfurt am Main, DE
142.177.155.55	AS855 Bell Canada	`4.88ms` from Fredericton, CA
61.154.162.87	AS4134 CHINANET-BACKBONE	`5.50ms` from Fuzhou, CN
39.135.60.135	AS56040 China Mobile communications corporation	`1.74ms` from Guangzhou, CN
125.242.49.23	AS17858 LG POWERCOMM	`2.06ms` from Incheon, KR
23.219.101.71	AS16625 Akamai Technologies, Inc.	`0.22ms` from Jakarta, ID
93.121.169.71	AS21351 Canal + Telecom SAS	`14.46ms` from Le Lamentin, MQ
222.189.62.151	AS4134 CHINANET-BACKBONE	`6.01ms` from Nanjing, CN
112.236.154.167	AS4837 CHINA UNICOM China169 Backbone	`8.42ms` from Qingdao, CN
44.196.123.231	AS14618 Amazon.com, Inc.	`0.22ms` from Reston, US
175.246.37.151	AS4766 Korea Telecom	`5.91ms` from Seoul, KR
57.182.177.103	AS16509 Amazon.com, Inc.	`0.21ms` from Tokyo, JP
40.233.100.151	AS31898 Oracle Corporation	`0.14ms` from Toronto, CA
91.97.41.135	AS9145 EWE TEL GmbH	`7.07ms` from Amsterdam, NL
71.139.126.183	AS7018 AT&T Enterprises, LLC	`1.63ms` from Atlanta, US
184.33.132.55	AS16509 Amazon.com, Inc.	`0.11ms` from Boardman, US
175.16.128.135	AS4837 CHINA UNICOM China169 Backbone	`3.27ms` from Changchun, CN
80.208.21.135	AS44869 FIBIA P/S	`3.25ms` from Copenhagen, DK
160.179.73.87	AS36903 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM	`4.36ms` from Rabat, MA
104.42.44.39	AS8075 Microsoft Corporation	`0.57ms` from San Jose, US
220.233.183.23	AS10143 Exetel Pty Ltd	`1.38ms` from Sydney, AU
73.173.77.71	AS7922 Comcast Cable Communications, LLC	`5.05ms` from Ashburn, US

Traceroute

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

traceroute -a -n -q1 -f2 -m7 128.121.43.202

traceroute to 128.121.43.202 (128.121.43.202): 7 hops max, 52 byte packets

2 [AS749] 11.73.8.114 1.477 ms

3 [AS749] 11.219.68.18 7.868 ms

4 [] 103.52.86.58 0.67 ms

5 *

6 *

7 *

Measurement taken from

IPinfo ProbeNet in Qingdao, CN

On March 29th 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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