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
128.121.44.0/23	AS3949	NTT America	512
128.121.15.0/24	AS204670	Quinstreet Inc	256
128.121.11.0/24	AS204670	NTT Com - Mitsubishi Corporation	256
128.121.32.0/24	AS204670	NTT DATA	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

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

IP Address	ASN	Details
128.121.43.30	AS3949 NTT America, Inc.	`24.57ms` from Frankfurt am Main, DE
128.121.42.136	AS3949 NTT America, Inc.	`24.57ms` 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
4.255.92.183	AS8075 Microsoft Corporation	`0.38ms` from Ashburn, US
146.12.134.7	AS397976 Central Access, Inc.	`7.08ms` from Atlanta, US
172.100.37.55	AS11351 Charter Communications Inc	`19.24ms` from Chicago, US
216.155.29.119	AS54103 MOD Mission Critical, LLC	`7.71ms` from Chicago, US
80.208.21.135	AS44869 FIBIA P/S	`3.27ms` from Copenhagen, DK
79.203.118.199	AS3320 Deutsche Telekom AG	`3.32ms` from Frankfurt am Main, DE
134.101.188.71	AS15943 wilhelm.tel GmbH	`0.45ms` from Hamburg, DE
90.243.154.167	AS5378 Vodafone Limited	`4.65ms` from London, GB
87.7.30.55	AS3269 Telecom Italia S.p.A.	`6.26ms` from Milan, IT
142.116.107.39	AS577 Bell Canada	`1.90ms` from Toronto, CA
176.122.229.247	AS199061 KM-NET SP. Z O.O.	`9.01ms` from Warsaw, PL
71.11.43.39	AS20115 Charter Communications LLC	`8.64ms` from Atlanta, US
202.146.110.231	AS15502 Vodafone Ireland Limited	`4.33ms` from Dublin, IE
31.104.175.39	AS2856 British Telecommunications PLC	`2.52ms` from London, GB
188.42.59.55	AS7979 Servers.com, Inc.	`4.66ms` from Luxembourg, LU
97.220.25.7	AS6167 Verizon Business	`15.82ms` from Miami, US
60.243.23.183	AS17488 Hathway IP Over Cable Internet	`1.79ms` from Saint Thomas Mount, IN
140.134.164.231	AS1659 Taiwan Academic Network (TANet) Information Center	`2.19ms` from Taichung, TW
59.84.169.247	AS10010 TOKAI Communications Corporation	`7.53ms` from Tokyo, JP
91.146.36.151	AS3226 OOO "NI"	`7.58ms` from Yekaterinburg, RU
181.56.149.23	AS10620 Telmex Colombia S.A.	`15.47ms` from Bogota, CO
178.116.225.55	AS6848 Telenet BV	`8.19ms` from Brussels, BE
65.184.25.215	AS11426 Charter Communications Inc	`5.94ms` from Charlotte, US
129.92.250.103	AS668 United States Department of Defense (DoD)	`4.19ms` from Chicago, US
168.245.139.87	AS27239 IT Management Corporation	`0.55ms` from Dallas, US

Traceroute

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

traceroute -a -n -q1 -f4 128.121.43.193

traceroute to 128.121.43.193 (128.121.43.193): 64 hops max, 52 byte packets

4 [AS2914] 213.198.52.22 0.323 ms

5 *

6 *

7 *

8 *

9 [AS3949] 128.121.43.193 24.695 ms

Measurement taken from

IPinfo ProbeNet in Frankfurt am Main, DE

On January 9th 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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