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:      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:      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:      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 5,644,934 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
104.21.48.1	7mmtv.sx	170598
104.21.53.211	onlinepokervidsdirect.info	2988
104.21.48.232	bitcoinwisdom.io	2314
104.21.59.50	rcity.co.il	2299
104.21.60.241	e-active.gr	2139
104.21.53.7	x99av.com	2084
104.21.63.229	multipointtv.com	1997
104.21.49.241	makemkv.com	1992
104.21.51.201	appdisqus.com	1979
104.21.62.20	full-novel.com	1908
104.21.58.180	akkarimmobilier.com	1897
104.21.58.158	digitalme.my	1870
104.21.61.57	kkmac.com	1807
104.21.62.13	available.forsale	1781
104.21.54.105	webcontabilidade.com	1739
104.21.53.20	britmodeller.com	1736
104.21.48.193	idiots.win	1719
104.21.58.97	jendow.com.tw	1718
104.21.59.130	esjzone.cc	1680
104.21.62.191	droidthunder.com	1678

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
104.21.57.145	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.62.252	AS13335 Cloudflare, Inc.	`0.11ms` from Lisbon, PT
104.21.60.9	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.59.63	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.54.195	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.51.135	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.55.147	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.61.125	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.56.26	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.49.232	AS13335 Cloudflare, Inc.	`0.11ms` from Wrocław, PL
104.21.52.171	AS13335 Cloudflare, Inc.	`0.11ms` from Lisbon, PT
104.21.58.73	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.63.154	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.50.219	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.53.240	AS13335 Cloudflare, Inc.	`0.10ms` from Wrocław, PL
104.21.48.119	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
72.66.94.36	AS701 Verizon Business	`2.35ms` from Ashburn, US
79.243.14.132	AS3320 Deutsche Telekom AG	`1.50ms` from Berlin, DE
61.157.76.244	AS4134 CHINANET-BACKBONE	`2.32ms` from Chengdu, CN
217.208.123.180	AS3301 Telia Company AB	`0.89ms` from Goeteborg, SE
87.129.66.196	AS3320 Deutsche Telekom AG	`0.86ms` from Hamburg, DE
37.138.31.132	AS9145 EWE TEL GmbH	`4.35ms` from Hamburg, DE
154.93.245.196	AS134548 DXTL Tseung Kwan O Service	`0.77ms` from Hong Kong, HK
61.147.176.4	AS137702 Nanjing, Jiangsu Province, P.R.China.	`10.60ms` from Huai'an, CN
90.194.217.52	AS5607 Sky UK Limited	`10.13ms` from London, GB
72.171.11.4	AS63062 Hughes Network Systems, LLC	`5.49ms` from Los Angeles, US
92.145.87.164	AS3215 Orange S.A.	`5.91ms` from Lyon, FR
209.37.23.164	AS7018 AT&T Enterprises, LLC	`2.98ms` from Miami, US
189.158.236.100	AS8151 UNINET	`1.81ms` from Monterrey, MX
131.108.100.244	AS61672 Entelvias provedor de internet ltda	`3.60ms` from Porto Alegre, BR
104.42.23.164	AS8075 Microsoft Corporation	`0.53ms` from San Jose, US
59.23.140.116	AS4766 Korea Telecom	`5.10ms` from Seoul, KR
46.103.144.20	AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA	`4.96ms` from Sofia, BG
125.199.177.52	AS2518 BIGLOBE Inc.	`17.90ms` from Tokyo, JP
180.2.191.180	AS4713 NTT DOCOMO BUSINESS,Inc.	`2.85ms` from Tokyo, JP
195.234.64.100	AS24951 EveryWare AG	`0.96ms` from Zuerich, CH
85.223.82.148	AS50266 Odido Netherlands B.V.	`3.52ms` from Amsterdam, NL
47.50.12.4	AS20115 Charter Communications LLC	`11.32ms` from Chicago, US
52.51.161.244	AS16509 Amazon.com, Inc.	`0.21ms` from Dublin, IE
52.57.149.100	AS16509 Amazon.com, Inc.	`0.18ms` from Frankfurt am Main, DE
175.162.192.244	AS4837 CHINA UNICOM China169 Backbone	`11.66ms` from Liaoyang, CN

Traceroute

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

traceroute -a -n -q1 104.21.55.1

traceroute to 104.21.55.1 (104.21.55.1): 64 hops max, 52 byte packets

1 [AS35179] 83.168.71.253 0.251 ms

2 *

3 [AS13335] 104.21.55.1 0.144 ms

Measurement taken from

IPinfo ProbeNet in Wrocław, PL

On December 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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