146.5.20.0/22

AS104 · University of Colorado at Boulder

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Summary

Country	United States
Domain	nso.edu
ASN	AS104
Parent Range	146.5.0.0/16
Registry	ARIN
ID	NSO-SUNSPOT

WHOIS Details

NetHandle:      NET-146-5-0-0-1
OrgID:          NSO
Parent:         NET-146-0-0-0-0
NetName:        NSO-SUNSPOT
NetRange:       146.5.0.0 - 146.5.255.255
NetType:        allocation
Comment:        National Solar Observatory
RegDate:        1991-01-15
Updated:        2021-12-14
TechHandle:     DOHER14-ARIN
Source:         ARIN


OrgID:          NSO
OrgName:        National Solar Observatory
CanAllocate:    
Street:         3665 Discovery Drive, 3rd Floor
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80303
RegDate:        1991-01-15
Updated:        2017-11-27
OrgAdminHandle: DOHER14-ARIN
OrgTechHandle:  DOHER14-ARIN
OrgAbuseHandle: DOHER14-ARIN
OrgNOCHandle:   DOHER14-ARIN
Source:         ARIN


POCHandle:      DOHER14-ARIN
IsRole:         N
LastName:       Doherty
FirstName:      John
Street:         3665 Discovery Dr.
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80303
RegDate:        2013-12-13
Updated:        2025-04-13
OfficePhone:    +1-303-735-9059
Mailbox:        [email protected]
Source:         ARIN

Overlapping Ranges

BGP prefixes that contain 146.5.20.0/22

Range	ASN	Company	Num of IPs
146.5.0.0/16	AS104	National Solar Observatory	65,536
146.5.0.0/16	AS11711	National Solar Observatory	65,536
146.5.0.0/16	AS6360	National Solar Observatory	65,536

Nearby Ranges

BGP prefixes that overlap with 146.5.0.0/16

Range	ASN	Company	Num of IPs
146.5.0.0/16	AS104	National Solar Observatory	65,536
146.5.0.0/16	AS11711	National Solar Observatory	65,536
146.5.0.0/16	AS6360	National Solar Observatory	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

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Pingable IPs

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

IP Address	ASN	Details
146.5.21.123	AS104 University of Colorado at Boulder	`1.74ms` from Denver, US
146.5.20.1	AS104 University of Colorado at Boulder	`1.80ms` from Denver, US
146.5.23.212	AS104 University of Colorado at Boulder	`1.22ms` from Denver, 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
54.73.127.54	AS16509 Amazon.com, Inc.	`0.28ms` from Dublin, IE
83.185.90.230	AS1257 Tele2 Sverige AB	`3.86ms` from Goeteborg, SE
118.140.155.150	AS9304 HGC Global Communications Limited	`1.23ms` from Hong Kong, HK
162.201.18.22	AS7018 AT&T Enterprises, LLC	`2.44ms` from Houston, US
115.151.158.134	AS4134 CHINANET-BACKBONE	`14.42ms` from Huai'an, CN
194.38.140.246	AS5626 ONITELECOM - INFOCOMUNICACOES, S.A.	`0.43ms` from Lisbon, PT
79.17.47.150	AS3269 Telecom Italia S.p.A.	`6.15ms` from Milan, IT
35.237.163.38	AS396982 Google LLC	`0.15ms` from Moncks Corner, US
95.79.52.182	AS42682 JSC "ER-Telecom Holding"	`6.30ms` from Moscow, RU
112.71.215.70	AS17511 OPTAGE Inc.	`2.44ms` from Osaka, JP
177.189.89.38	AS27699 TELEFÔNICA BRASIL S.A	`13.60ms` from Osasco, BR
89.185.234.70	AS24971 MasterDC s.r.o.	`0.21ms` from Prague, CZ
44.210.102.182	AS14618 Amazon.com, Inc.	`0.36ms` from Reston, US
182.162.219.150	AS3786 LG DACOM Corporation	`1.22ms` from Seoul, KR
175.251.132.230	AS4766 Korea Telecom	`8.98ms` from Seoul, KR
118.219.165.246	AS9318 SK Broadband Co Ltd	`6.65ms` from Seoul, KR
119.118.251.150	AS4837 CHINA UNICOM China169 Backbone	`2.14ms` from Tieling, CN
219.54.144.246	AS17676 SoftBank Corp.	`3.31ms` from Tokyo, JP
191.97.121.134	AS264733 CHACO COMUNICACIONES S.A.	`7.54ms` from Asuncion, PY
192.99.89.38	AS16276 OVH SAS	`0.08ms` from Beauharnois, CA
121.25.175.22	AS4837 CHINA UNICOM China169 Backbone	`8.76ms` from Beijing, CN
151.102.242.118	AS32104 Wellmont Health System	`13.78ms` from Charlotte, US
199.167.61.246	AS395273 Altafiber	`0.61ms` from Cincinnati, US
20.223.224.166	AS8075 Microsoft Corporation	`0.14ms` from Dublin, IE
83.246.99.230	AS24679 kyberio GmbH	`5.08ms` from Frankfurt am Main, DE

Traceroute

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

traceroute -a -n -q1 -f3 146.5.23.209

traceroute to 146.5.23.209 (146.5.23.209): 64 hops max, 52 byte packets

3 [] 206.53.175.22 0.38 ms

4 [AS104] 198.59.55.9 1.407 ms

5 [AS104] 128.138.81.254 1.236 ms

6 [AS104] 198.59.55.118 1.242 ms

7 [AS104] 146.5.23.209 1.282 ms

Measurement taken from

IPinfo ProbeNet in Denver, US

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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