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Summary

Country	United States
Domain	cloudflare.com
ASN	AS13335
Registry	ARIN
ID	CLOUDFLARENET

WHOIS Details

NetHandle:      NET-172-64-0-0-1
OrgID:          CLOUD14
Parent:         NET-172-0-0-0-0
NetName:        CLOUDFLARENET
NetRange:       172.64.0.0 - 172.71.255.255
NetType:        allocation
Comment:        All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Comment:        Geofeed: https://api.cloudflare.com/local-ip-ranges.csv
RegDate:        2015-02-25
Updated:        2024-09-04
TechHandle:     ADMIN2521-ARIN
AbuseHandle:    ABUSE2916-ARIN
NOCHandle:      NOC11962-ARIN
Source:         ARIN


OrgID:          CLOUD14
OrgName:        Cloudflare, Inc.
CanAllocate:    
Street:         101 Townsend Street
City:           San Francisco
State/Prov:     CA
Country:        US
PostalCode:     94107
RegDate:        2010-07-09
Updated:        2024-11-25
OrgAdminHandle: ADMIN2521-ARIN
OrgTechHandle:  ADMIN2521-ARIN
OrgAbuseHandle: ABUSE2916-ARIN
OrgNOCHandle:   CLOUD146-ARIN
OrgRoutingHandle:   CLOUD146-ARIN
Source:         ARIN


POCHandle:      ABUSE2916-ARIN
IsRole:         Y
LastName:       Abuse
FirstName:      
Street:         101 Townsend Street
City:           San Francisco
State/Prov:     CA
Country:        US
PostalCode:     94107
RegDate:        2011-02-14
Updated:        2024-09-04
OfficePhone:    +1-650-319-8930
Mailbox:        abuse@cloudflare.com
Source:         ARIN


POCHandle:      ADMIN2521-ARIN
IsRole:         Y
LastName:       Admin
FirstName:      
Street:         101 Townsend Street
City:           San Francisco
State/Prov:     CA
Country:        US
PostalCode:     94107
RegDate:        2011-04-19
Updated:        2025-06-12
OfficePhone:    +1-650-319-8930
Mailbox:        rir@cloudflare.com
Source:         ARIN


POCHandle:      NOC11962-ARIN
IsRole:         Y
LastName:       NOC
FirstName:      
Street:         101 Townsend Street
City:           San Francisco
State/Prov:     CA
Country:        US
PostalCode:     94107
RegDate:        2011-04-19
Updated:        2026-04-30
OfficePhone:    +1-650-319-8930
Mailbox:        noc@cloudflare.com
Source:         ARIN


POCHandle:      CLOUD146-ARIN
IsRole:         Y
LastName:       Cloudflare-NOC
FirstName:      
Street:         101 Townsend St
City:           San Francsico
State/Prov:     CA
Country:        US
PostalCode:     94107
RegDate:        2021-07-01
Updated:        2025-08-20
OfficePhone:    +1-650-319-8930
Mailbox:        noc@cloudflare.com
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 172.66.0.0/16

No nearby ranges found.

Hosted domains

There are 15,401 domain names hosted across 1,751 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
172.66.135.196	ait.com	831
172.66.137.206	ait.com	789
172.66.132.87	msha.ke	481
172.66.132.86	msha.ke	430
172.66.137.29	adoption.com	291
172.66.132.218	adoption.com	285
172.66.133.186	givebutter.com	221
172.66.137.33	givebutter.com	212
172.66.136.159	11880.com	178
172.66.135.81	11880.com	175
172.66.128.106	uniformadvantage.com	163
172.66.134.14	winterhalter.co.id	161
172.66.133.251	cotta.ge	120
172.66.136.32	cms.law	106
172.66.133.147	pcmatic.com	97
172.66.137.113	montagehotels.com	93
172.66.135.237	thetrevorproject.org	93
172.66.129.2	jonathanossoff.net	92
172.66.132.128	palsgaard.rs	91
172.66.134.215	montagehotels.com	90

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

4,086 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
172.66.136.39	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.131.61	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.132.36	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.137.187	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.140.234	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.139.117	AS13335 Cloudflare, Inc.	`0.11ms` from Yerevan, AM
172.66.134.183	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.135.138	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
172.66.143.165	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.128.148	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.138.99	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
172.66.130.252	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.141.188	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.129.75	AS13335 Cloudflare, Inc.	`0.12ms` from Yerevan, AM
172.66.133.76	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
172.66.142.140	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT

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
52.240.138.116	AS8075 Microsoft Corporation	`0.18ms` from Chicago, US
3.133.44.116	AS16509 Amazon.com, Inc.	`0.16ms` from Columbus, US
76.251.44.100	AS7018 AT&T Enterprises, LLC	`2.90ms` from Dallas, US
3.68.43.212	AS16509 Amazon.com, Inc.	`0.20ms` from Frankfurt am Main, DE
62.54.50.180	AS6805 Telefonica Germany GmbH & Co.OHG	`4.68ms` from Frankfurt am Main, DE
183.80.62.36	AS18403 FPT Telecom Company	`1.37ms` from Hanoi, VN
14.231.154.52	AS45899 VNPT Corp	`1.30ms` from Hanoi, VN
1.243.222.20	AS9318 SK Broadband Co Ltd	`1.40ms` from Incheon, KR
62.7.90.132	AS2856 British Telecommunications PLC	`3.50ms` from London, GB
142.171.187.116	AS35916 MULTACOM CORPORATION	`0.25ms` from Los Angeles, US
76.219.189.132	AS7018 AT&T Enterprises, LLC	`17.23ms` from Los Angeles, US
178.124.71.228	AS6697 Republican Unitary Telecommunication Enterprise Beltelecom	`6.68ms` from Minsk, BY
143.189.121.148	AS2527 Sony Network Communications Inc.	`8.58ms` from Tokyo, JP
83.168.118.132	AS35007 Miconet Sp. z o.o.	`3.88ms` from Wrocław, PL
77.161.243.180	AS1136 KPN B.V.	`2.25ms` from Amsterdam, NL
41.233.13.244	AS8452 TE-AS	`8.82ms` from Cairo, EG
149.174.3.100	AS272096 PACKETHUB S.A.	`0.19ms` from Houston, US
174.49.48.180	AS7922 Comcast Cable Communications, LLC	`6.85ms` from Murfreesboro, US
83.204.160.84	AS3215 Orange S.A.	`1.82ms` from Paris, FR
44.222.206.84	AS14618 Amazon.com, Inc.	`0.48ms` from Reston, US
87.228.75.116	AS49505 JSC Selectel	`0.52ms` from Saint Petersburg, RU
179.15.135.52	AS27831 Colombia Móvil	`15.32ms` from Bogota, CO
157.55.163.196	AS8075 Microsoft Corporation	`0.17ms` from Chicago, US
124.162.147.68	AS4837 CHINA UNICOM China169 Backbone	`6.55ms` from Chongqing, CN
136.113.126.116	AS396982 Google LLC	`0.13ms` from Council Bluffs, US

Traceroute

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

traceroute -a -n -q1 -f6 172.66.143.171

traceroute to 172.66.143.171 (172.66.143.171): 64 hops max, 52 byte packets

6 [AS13335] 172.66.143.171 0.165 ms

Measurement taken from

IPinfo ProbeNet in Yerevan, AM

On May 4th 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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