104.21.48.0/20

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:      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

Nearby Ranges

BGP prefixes that overlap with 104.21.0.0/16

No nearby ranges found.

Hosted domains

There are 5,508,353 domain names hosted across 4,051 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
104.21.51.47	myboerse.bz	3690
104.21.48.232	bitcoinwisdom.io	2244
104.21.63.160	almaqalah.com	2242
104.21.63.229	multipointtv.com	1942
104.21.49.241	makemkv.com	1924
104.21.50.72	sharktank.co.in	1913
104.21.51.201	appdisqus.com	1906
104.21.62.20	full-novel.com	1892
104.21.63.24	zeerk.com	1844
104.21.58.252	dodi-repacks.site	1838
104.21.58.158	digitalme.my	1771
104.21.51.61	xszj.org	1736
104.21.55.174	selimpasaspor.org	1712
104.21.62.13	available.forsale	1710
104.21.50.28	adjaranet.to	1706
104.21.61.68	suspended-website.com	1697
104.21.48.193	idiots.win	1670
104.21.62.191	droidthunder.com	1643
104.21.49.7	gravity.ai	1639
104.21.59.130	esjzone.cc	1635

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
104.21.55.152	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.62.18	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.52.213	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.50.233	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.63.122	AS13335 Cloudflare, Inc.	`0.12ms` from Yerevan, AM
104.21.61.169	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.54.133	AS13335 Cloudflare, Inc.	`0.12ms` from Lisbon, PT
104.21.51.97	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.57.92	AS13335 Cloudflare, Inc.	`0.12ms` from Yerevan, AM
104.21.60.128	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.58.16	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.48.134	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.53.105	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.49.194	AS13335 Cloudflare, Inc.	`0.13ms` from Lisbon, PT
104.21.59.145	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.56.185	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
20.121.136.36	AS8075 Microsoft Corporation	`0.71ms` from Ashburn, US
73.186.127.52	AS7922 Comcast Cable Communications, LLC	`9.36ms` from Boston, US
34.245.67.212	AS16509 Amazon.com, Inc.	`0.18ms` from Dublin, IE
182.177.179.20	AS17557 Pakistan Telecommunication Company Limited	`8.95ms` from Islamabad, PK
4.159.38.212	AS8075 Microsoft Corporation	`0.17ms` from London, GB
83.43.203.84	AS3352 TELEFONICA DE ESPANA S.A.U.	`9.15ms` from Madrid, ES
159.84.182.68	AS1945 Renater	`5.74ms` from Marseille, FR
86.194.251.212	AS3215 Orange S.A.	`6.21ms` from Marseille, FR
90.147.178.228	AS137 Consortium GARR	`5.82ms` from Rome, IT
182.220.30.116	AS17858 LG POWERCOMM	`2.95ms` from Seoul, KR
49.142.114.148	AS7623 Gyeongbuk Cable TV	`6.67ms` from Seoul, KR
77.34.254.148	AS12389 PJSC Rostelecom	`0.90ms` from Vladivostok, RU
112.46.24.36	AS140105 Shaanxi Mobile Communication Company Limited	`2.21ms` from Xi'an, CN
161.189.3.180	AS135629 Ningxia West Cloud Data Technology Co.Ltd.	`0.49ms` from Zhongwei, CN
118.148.32.20	AS9790 Two Degrees Networks Limited	`1.31ms` from Auckland, NZ
186.114.217.196	AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC	`8.91ms` from Bogota, CO
24.93.121.20	AS10796 Charter Communications Inc	`9.01ms` from Columbus, US
97.228.183.20	AS6167 Verizon Business	`10.88ms` from Denver, US
178.142.150.68	AS9145 EWE TEL GmbH	`5.62ms` from Hamburg, DE
66.8.150.84	AS20001 Charter Communications Inc	`10.51ms` from Honolulu, US
77.92.133.36	AS42910 PremierDC Veri Merkezi Anonim Sirketi	`0.38ms` from Istanbul, TR
186.193.110.244	AS28220 Alares Cabo Servicos de Telecomunicacoes S.A.	`6.09ms` from Osasco, BR
2.11.14.116	AS3215 Orange S.A.	`7.53ms` from Paris, FR
107.191.232.148	AS23317 Whitman College	`7.08ms` from Seattle, US
14.44.56.84	AS4766 Korea Telecom	`6.42ms` from Seoul, KR

Traceroute

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

traceroute -a -n -q1 -f3 104.21.50.57

traceroute to 104.21.50.57 (104.21.50.57): 64 hops max, 52 byte packets

3 [AS513] 192.65.185.228 9.925 ms

4 [AS13335] 104.21.50.57 0.207 ms

Measurement taken from

IPinfo ProbeNet in Geneve, CH

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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