104.21.0.0/20

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 5,425,241 domain names hosted across 3,974 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
104.21.7.159	spiderworks.ae	3278
104.21.3.95	qualityespacio.com	3191
104.21.0.188	channel-frequency.info	2659
104.21.5.202	premiumlinkgenerator.com	2215
104.21.1.72	klik.hr	2150
104.21.5.132	mykindofmeeple.com	2114
104.21.0.228	sonoff.ru	1984
104.21.1.132	pemkomedan.go.id	1767
104.21.8.86	groove.cm	1758
104.21.2.116	vxxx.work	1722
104.21.1.189	priceza.co.id	1661
104.21.4.186	takhail.com	1660
104.21.5.83	skygates.net	1621
104.21.4.84	solitario-verde.com	1607
104.21.9.86	bitcoin.org	1606
104.21.15.224	yourbrowser.is	1602
104.21.0.154	bcloud.ma	1597
104.21.2.6	todaybing.com	1587
104.21.9.46	dateful.com	1585
104.21.4.12	dogry.pl	1582

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
104.21.2.131	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.9.191	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.4.189	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.15.38	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.12.116	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.3.28	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.11.62	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.5.205	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.13.154	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.6.177	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.8.16	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.1.104	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.14.176	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.0.131	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.10.160	AS13335 Cloudflare, Inc.	`0.10ms` from Lisbon, PT
104.21.7.34	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
172.13.170.100	AS7018 AT&T Enterprises, LLC	`18.18ms` from Atlanta, US
47.81.35.212	AS45102 Alibaba (US) Technology Co., Ltd.	`0.15ms` from Bangkok, TH
84.151.252.148	AS3320 Deutsche Telekom AG	`2.44ms` from Duesseldorf, DE
69.206.150.20	AS12271 Charter Communications Inc	`9.76ms` from New York City, US
73.240.83.84	AS7922 Comcast Cable Communications, LLC	`2.65ms` from Portland, US
223.167.51.4	AS17621 China Unicom Shanghai network	`3.06ms` from Shanghai, CN
112.31.144.68	AS9808 China Mobile Communications Group Co., Ltd.	`8.24ms` from Suzhou, CN
171.119.171.244	AS4837 CHINA UNICOM China169 Backbone	`4.82ms` from Taiyuan, CN
23.37.179.116	AS16625 Akamai Technologies, Inc.	`0.13ms` from Al Fujairah City, AE
64.24.86.36	AS7029 Windstream Communications LLC	`2.17ms` from Atlanta, US
3.131.233.228	AS16509 Amazon.com, Inc.	`0.15ms` from Columbus, US
177.130.194.164	AS28270 Videomar Rede Nordeste S/A	`3.48ms` from Fortaleza, BR
178.8.187.132	AS3209 Vodafone GmbH	`14.25ms` from Frankfurt am Main, DE
39.49.54.228	AS17557 Pakistan Telecommunication Company Limited	`10.33ms` from Lahore, PK
83.99.38.20	AS6661 POST Luxembourg	`1.17ms` from Luxembourg, LU
65.128.191.196	AS209 CenturyLink Communications, LLC	`2.72ms` from Minneapolis, US
199.244.78.4	AS36354 SherWeb inc.	`0.82ms` from Montreal, CA
205.151.45.4	AS376 Reseau d'Informations Scientifiques du Quebec (RISQ Inc.)	`1.80ms` from Montreal, CA
87.171.165.52	AS3320 Deutsche Telekom AG	`2.85ms` from Nuernberg, DE
39.82.161.148	AS4837 CHINA UNICOM China169 Backbone	`6.55ms` from Qingdao, CN
174.129.144.148	AS14618 Amazon.com, Inc.	`0.19ms` from Reston, US
158.39.2.196	AS224 SIKT - KUNNSKAPSSEKTORENS TJENESTELEVERANDOR	`2.33ms` from Sandefjord, NO
1.60.28.196	AS4837 CHINA UNICOM China169 Backbone	`19.10ms` from Changchun, CN
177.1.54.148	AS8167 V tal	`1.02ms` from Curitiba, BR
54.170.101.100	AS16509 Amazon.com, Inc.	`0.11ms` from Dublin, IE

Traceroute

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

traceroute -a -n -q1 104.21.5.56

traceroute to 104.21.5.56 (104.21.5.56): 64 hops max, 52 byte packets

1 [AS35179] 83.168.71.253 0.195 ms

2 *

3 [AS13335] 104.21.5.56 0.13 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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