146.189.128.0/21

AS5724 · University of Massachusetts Medical School

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Summary

Country	United States
Domain	umassmed.edu
ASN	AS5724
Parent Range	146.189.0.0/16
Registry	ARIN
ID	UMASSMED

WHOIS Details

NetHandle:      NET-146-189-0-0-1
OrgID:          UMMC-1-Z
Parent:         NET-146-0-0-0-0
NetName:        UMASSMED
NetRange:       146.189.0.0 - 146.189.255.255
NetType:        allocation
RegDate:        1991-02-26
Updated:        2023-07-01
TechHandle:     HOSTE28-ARIN
Source:         ARIN


OrgID:          UMMC-1-Z
OrgName:        University of Massachusetts Medical School
CanAllocate:    
Street:         55 Lake Avenue North
City:           Worcester
State/Prov:     MA
Country:        US
PostalCode:     01655
RegDate:        2023-06-20
Updated:        2023-06-20
OrgAdminHandle: HOSTE28-ARIN
OrgTechHandle:  HOSTE28-ARIN
OrgAbuseHandle: HOSTE28-ARIN
OrgNOCHandle:   HOSTE28-ARIN
Source:         ARIN


POCHandle:      HOSTE28-ARIN
IsRole:         Y
LastName:       Hosted Services
FirstName:      
Street:         333 South Street
City:           Shrewsbury
State/Prov:     MA
Country:        US
PostalCode:     01545-4169
RegDate:        2017-06-20
Updated:        2025-01-07
OfficePhone:    +1-508-612-1138
Mailbox:        HostedServices@umassmed.edu
Source:         ARIN

Overlapping Ranges

BGP prefixes that contain 146.189.128.0/21

Range	ASN	Company	Num of IPs
146.189.0.0/16	AS5724	University of Massachusetts Medical School	65,536

Nearby Ranges

BGP prefixes that overlap with 146.189.0.0/16

Range	ASN	Company	Num of IPs
146.189.0.0/16	AS5724	University of Massachusetts Medical School	65,536

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

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

IP Address	ASN	Details
146.189.128.251	AS5724 University of Massachusetts Medical School	`2.06ms` from Boston, US

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
177.43.67.197	AS18881 TELEFÔNICA BRASIL S.A	`0.75ms` from Brasilia, BR
152.179.136.37	AS701 Verizon Business	`0.27ms` from Chicago, US
204.106.249.5	AS47038 DMCI Broadband, LLC.	`5.43ms` from Detroit, US
212.16.251.5	AS12759 Stephan Fuss trading as SoftCom Datensysteme	`1.49ms` from Duesseldorf, DE
59.38.142.165	AS4134 CHINANET-BACKBONE	`2.85ms` from Guangzhou, CN
211.178.174.101	AS9318 SK Broadband Co Ltd	`1.09ms` from Incheon, KR
39.32.172.21	AS17557 Pakistan Telecommunication Company Limited	`5.13ms` from Islamabad, PK
83.217.9.85	AS215540 GLOBAL CONNECTIVITY SOLUTIONS LLP	`0.46ms` from Istanbul, TR
102.133.196.133	AS8075 Microsoft Corporation	`0.13ms` from Johannesburg, ZA
79.151.104.5	AS3352 TELEFONICA DE ESPANA S.A.U.	`7.64ms` from Madrid, ES
118.195.201.165	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.04ms` from Nanjing, CN
126.29.206.133	AS17676 SoftBank Corp.	`7.00ms` from Osaka, JP
37.58.252.37	AS16347 ADISTA SAS	`7.32ms` from Paris, FR
189.250.214.21	AS8151 UNINET	`9.71ms` from Santiago de Queretaro, MX
121.147.100.101	AS4766 Korea Telecom	`5.29ms` from Seoul, KR
101.95.187.21	AS4812 China Telecom (Group)	`2.06ms` from Shanghai, CN
126.46.73.69	AS17676 SoftBank Corp.	`15.79ms` from Tokyo, JP
188.16.107.53	AS12389 PJSC Rostelecom	`7.78ms` from Yekaterinburg, RU
27.109.17.21	AS17625 BlazeNet's Network	`2.11ms` from Ahmedabad, IN
145.131.199.149	AS28685 Routit BV	`3.89ms` from Amsterdam, NL
91.176.240.197	AS5432 Proximus NV	`2.43ms` from Brussels, BE
93.122.180.69	AS8953 Orange Romania S.A.	`17.00ms` from Bucharest, RO
54.171.63.181	AS16509 Amazon.com, Inc.	`0.21ms` from Dublin, IE
4.209.221.165	AS8075 Microsoft Corporation	`0.14ms` from Dublin, IE
223.19.227.165	AS9304 HGC Global Communications Limited	`1.38ms` from Hong Kong, HK

Traceroute

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

traceroute -a -n -q1 -f4 -m9 146.189.129.217

traceroute to 146.189.129.217 (146.189.129.217): 9 hops max, 52 byte packets

4 [AS6939] 184.104.192.90 4.165 ms

5 *

6 [AS6939] 184.104.188.54 33.759 ms

7 *

8 *

9 *

Measurement taken from

IPinfo ProbeNet in Riga, LV

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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