104.21.32.0/20

AS13335 · Cloudflare, Inc.

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Summary

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

WHOIS Details

NetHandle:      NET-104-16-0-0-1
OrgID:          CLOUD14
Parent:         NET-104-0-0-0-0
NetName:        CLOUDFLARENET
NetRange:       104.16.0.0 - 104.31.255.255
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:        2014-03-28
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:        [email protected]
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:        2025-03-12
OfficePhone:    +1-650-319-8930
Mailbox:        [email protected]
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:        [email protected]
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:        [email protected]
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 104.21.0.0/16

No nearby ranges found.

Hosted domains

There are 5,685,359 domain names hosted across 4,050 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
104.21.43.246	3793x.xyz	7133
104.21.45.76	aluracursos.com	6745
104.21.42.227	newsstary.com	3947
104.21.36.242	remstroy.kr.ua	2622
104.21.47.194	pusica.com	2578
104.21.38.23	adsvancer.com	2467
104.21.41.107	filman.cc	2326
104.21.36.68	podatki.biz	2214
104.21.36.112	jargonism.com	2052
104.21.40.241	xxxporn123.com	2051
104.21.47.46	lewdweb.net	1964
104.21.47.101	bongdawap.com	1877
104.21.43.211	tmclub.eu	1845
104.21.35.29	paulus.com.br	1762
104.21.38.106	99s91.cc	1728
104.21.36.183	skymovieshd.club	1680
104.21.39.52	cook1cook.com	1669
104.21.47.228	aldirasa.com	1654
104.21.32.25	uporn.icu	1650
104.21.42.51	ytvideoindir.net	1632

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

4,096 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
104.21.37.196	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.35.70	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.39.71	AS13335 Cloudflare, Inc.	`0.11ms` from Lisbon, PT
104.21.40.130	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.36.138	AS13335 Cloudflare, Inc.	`0.09ms` from Lisbon, PT
104.21.42.0	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.45.9	AS13335 Cloudflare, Inc.	`0.10ms` from Lisbon, PT
104.21.41.36	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.38.51	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.33.43	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.43.37	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.44.39	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.47.129	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.32.94	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.46.213	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.34.235	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL

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
98.62.17.180	AS7922 Comcast Cable Communications, LLC	`5.37ms` from Atlanta, US
103.140.65.4	AS139236 Local Government Engineering Department (LGED)	`0.85ms` from Dhaka, BD
147.135.182.228	AS16276 OVH SAS	`0.07ms` from Gravelines, FR
103.86.178.20	AS136412 Titan System Integration Sdn Bhd	`0.55ms` from Kuala Lumpur, MY
39.45.56.52	AS17557 Pakistan Telecommunication Company Limited	`2.87ms` from Lahore, PK
82.48.185.132	AS3269 Telecom Italia S.p.A.	`1.89ms` from Milan, IT
45.144.168.20	AS49505 JSC Selectel	`1.03ms` from Saint Petersburg, RU
182.215.5.100	AS17858 LG POWERCOMM	`7.10ms` from Seoul, KR
1.241.52.228	AS9318 SK Broadband Co Ltd	`1.86ms` from Seoul, KR
106.75.253.68	AS4812 China Telecom (Group)	`3.67ms` from Shanghai, CN
203.137.162.180	AS4694 IDC Frontier Inc.	`3.60ms` from Tokyo, JP
75.228.123.36	AS6167 Verizon Business	`13.77ms` from Atlanta, US
191.107.134.20	AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC	`5.33ms` from Bogota, CO
20.22.112.148	AS8075 Microsoft Corporation	`0.30ms` from Boydton, US
175.154.193.180	AS4837 CHINA UNICOM China169 Backbone	`5.11ms` from Chengdu, CN
158.41.147.196	AS1448 United Cooperative Services	`4.03ms` from Dallas, US
40.122.3.132	AS8075 Microsoft Corporation	`0.55ms` from Des Moines, US
79.205.78.20	AS3320 Deutsche Telekom AG	`1.40ms` from Duesseldorf, DE
119.189.155.244	AS4837 CHINA UNICOM China169 Backbone	`3.95ms` from Jinan, CN
103.20.160.4	AS134765 CHINANET Yunnan province IDC1 network	`0.70ms` from Kunming, CN
119.92.27.4	AS9299 Philippine Long Distance Telephone Company	`1.23ms` from Manila, PH
208.72.177.100	AS13625 CALGAH Computer Systems and Management Ltd	`0.72ms` from Montreal, CA
88.121.39.84	AS12322 Free SAS	`2.67ms` from Paris, FR
176.171.110.100	AS5410 Bouygues Telecom SA	`12.76ms` from Paris, FR
91.122.167.132	AS12389 PJSC Rostelecom	`1.53ms` from Saint Petersburg, RU

Traceroute

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

traceroute -a -n -q1 104.21.36.14

traceroute to 104.21.36.14 (104.21.36.14): 64 hops max, 52 byte packets

1 [AS35179] 83.168.71.253 0.444 ms

2 *

3 [AS13335] 104.21.36.14 0.132 ms

Measurement taken from

IPinfo ProbeNet in Wrocław, PL

On December 6th 2025

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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