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:      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


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:      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

Nearby Ranges

BGP prefixes that overlap with 104.21.0.0/16

No nearby ranges found.

Hosted domains

There are 5,522,146 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
104.21.42.227	newsstary.com	4183
104.21.34.23	voicetaster.com	2826
104.21.33.127	metools.info	2205
104.21.40.250	ngontinh24.com	2095
104.21.34.55	desu-online.pl	2036
104.21.36.112	jargonism.com	1962
104.21.33.222	bradfordnashville.com	1839
104.21.43.211	tmclub.eu	1801
104.21.39.199	futchief.com	1764
104.21.40.43	eriri.net	1749
104.21.34.185	kcsc.org.uk	1743
104.21.33.213	noagendasocial.com	1701
104.21.38.106	99s91.cc	1688
104.21.32.34	enseat-hanger.com	1663
104.21.32.221	xxxcomics.org	1653
104.21.47.201	mangasusu.co.in	1640
104.21.39.52	cook1cook.com	1636
104.21.38.248	nukistream.com	1629
104.21.37.52	venasbet.com	1627
104.21.45.189	cqbanghe.com	1588

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
104.21.41.45	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.36.253	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.43.155	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.46.13	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.47.136	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.37.10	AS13335 Cloudflare, Inc.	`0.12ms` from Lisbon, PT
104.21.45.190	AS13335 Cloudflare, Inc.	`0.13ms` from Brisbane, AU
104.21.42.157	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.32.242	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.44.113	AS13335 Cloudflare, Inc.	`0.12ms` from Lisbon, PT
104.21.33.198	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.38.250	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.40.190	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.35.128	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.39.176	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.34.255	AS13335 Cloudflare, Inc.	`0.11ms` 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
176.12.72.52	AS205431 HostLab LLC	`0.55ms` from Almaty, KZ
24.125.116.52	AS7922 Comcast Cable Communications, LLC	`4.83ms` from Atlanta, US
35.94.203.20	AS16509 Amazon.com, Inc.	`0.56ms` from Boardman, US
173.237.17.180	AS7979 Servers.com, Inc.	`0.27ms` from Dallas, US
70.36.80.36	AS32808 Utah Broadband LLC	`0.47ms` from Draper, US
84.158.16.4	AS3320 Deutsche Telekom AG	`9.72ms` from Frankfurt am Main, DE
91.22.220.164	AS3320 Deutsche Telekom AG	`2.58ms` from Frankfurt am Main, DE
134.238.79.196	AS394089 Google LLC	`0.10ms` from Frankfurt am Main, DE
119.146.31.36	AS4134 CHINANET-BACKBONE	`4.67ms` from Guangzhou, CN
94.100.129.4	AS13237 euNetworks GmbH	`1.92ms` from London, GB
107.163.236.36	AS18978 Enzu Inc	`0.64ms` from Los Angeles, US
38.15.147.52	AS55286 B2 Net Solutions Inc.	`0.46ms` from Montreal, CA
122.175.139.196	AS24560 Bharti Airtel Ltd., Telemedia Services	`14.99ms` from Mumbai, IN
173.171.155.228	AS33363 Charter Communications, Inc	`11.99ms` from Orlando, US
3.211.176.132	AS14618 Amazon.com, Inc.	`0.14ms` from Reston, US
91.122.206.148	AS12389 PJSC Rostelecom	`17.14ms` from Saint Petersburg, RU
211.185.149.52	AS4766 Korea Telecom	`3.90ms` from Seoul, KR
175.215.163.164	AS4766 Korea Telecom	`7.27ms` from Seoul, KR
52.196.96.68	AS16509 Amazon.com, Inc.	`0.23ms` from Tokyo, JP
120.133.88.196	AS23724 IDC, China Telecommunications Corporation	`3.08ms` from Beijing, CN
13.59.212.228	AS16509 Amazon.com, Inc.	`0.14ms` from Columbus, US
34.56.154.148	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
104.154.85.164	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
20.109.145.68	AS8075 Microsoft Corporation	`0.20ms` from Quincy, US
122.234.35.196	AS4134 CHINANET-BACKBONE	`6.58ms` from Shanghai, CN

Traceroute

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

traceroute -a -n -q1 -f3 104.21.44.75

traceroute to 104.21.44.75 (104.21.44.75): 64 hops max, 52 byte packets

3 [AS8932] 185.48.241.27 0.766 ms

4 [AS13335] 104.21.44.75 0.169 ms

Measurement taken from

IPinfo ProbeNet in Yerevan, AM

On November 28th 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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