104.21.16.0/20

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:        noc@cloudflare.com
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:        noc@cloudflare.com
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:        abuse@cloudflare.com
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:        rir@cloudflare.com
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 104.21.0.0/16

No nearby ranges found.

Hosted domains

There are 5,530,912 domain names hosted across 4,052 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
104.21.16.1	xgroovy.com	355465
104.21.30.80	cdsoso.cc	3585
104.21.28.189	hotcharts.net	2491
104.21.16.247	ftuapps.dev	2185
104.21.31.131	downloaderfiles.wiki	1936
104.21.27.253	gimbalinsider.com	1898
104.21.27.112	darkbzoj.cc	1848
104.21.24.154	payingsocialmediajobs.com	1825
104.21.31.249	turkustan.az	1807
104.21.27.240	dcreato.com	1758
104.21.20.226	banana-pi.org	1630
104.21.26.117	picsegg.com	1627
104.21.28.159	thenekodark.com	1615
104.21.20.128	therewardbag.com	1614
104.21.19.226	newslife.info	1610
104.21.27.219	sportshen.com	1606
104.21.29.178	apkloo.com	1569
104.21.21.43	stalinks.com	1549
104.21.19.202	ricepuritytests.net	1537
104.21.25.182	vegus168.info	1533

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
104.21.16.223	AS13335 Cloudflare, Inc.	`0.14ms` from Brisbane, AU
104.21.20.54	AS13335 Cloudflare, Inc.	`0.12ms` from Yerevan, AM
104.21.22.229	AS13335 Cloudflare, Inc.	`0.13ms` from Brisbane, AU
104.21.27.61	AS13335 Cloudflare, Inc.	`0.14ms` from Luxembourg, LU
104.21.25.40	AS13335 Cloudflare, Inc.	`0.14ms` from Yerevan, AM
104.21.23.165	AS13335 Cloudflare, Inc.	`0.14ms` from Yerevan, AM
104.21.30.203	AS13335 Cloudflare, Inc.	`0.13ms` from Auckland, NZ
104.21.28.225	AS13335 Cloudflare, Inc.	`0.14ms` from Yerevan, AM
104.21.17.110	AS13335 Cloudflare, Inc.	`0.13ms` from Auckland, NZ
104.21.29.93	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.31.98	AS13335 Cloudflare, Inc.	`0.13ms` from Brisbane, AU
104.21.24.43	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.19.136	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
104.21.26.105	AS13335 Cloudflare, Inc.	`0.13ms` from Brisbane, AU
104.21.21.92	AS13335 Cloudflare, Inc.	`0.14ms` from Brisbane, AU
104.21.18.245	AS13335 Cloudflare, Inc.	`0.14ms` from Johannesburg, ZA

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
213.118.236.164	AS6848 Telenet BV	`8.34ms` from Brussels, BE
217.83.138.148	AS3320 Deutsche Telekom AG	`2.44ms` from Frankfurt am Main, DE
89.166.76.180	AS16086 DNA Oyj	`3.16ms` from Helsinki, FI
185.20.98.68	AS20860 IOMART CLOUD SERVICES LIMITED	`3.00ms` from London, GB
16.50.33.132	AS16509 Amazon.com, Inc.	`0.58ms` from Melbourne, AU
73.204.18.116	AS7922 Comcast Cable Communications, LLC	`5.40ms` from Miami, US
174.53.202.132	AS7922 Comcast Cable Communications, LLC	`5.98ms` from Minneapolis, US
143.48.12.148	AS13748 Cold Spring Harbor Laboratory	`1.52ms` from New York City, US
18.209.171.148	AS14618 Amazon.com, Inc.	`0.64ms` from Reston, US
3.84.16.68	AS14618 Amazon.com, Inc.	`0.42ms` from Reston, US
54.183.148.196	AS16509 Amazon.com, Inc.	`0.15ms` from San Jose, US
98.238.141.4	AS7922 Comcast Cable Communications, LLC	`7.75ms` from San Jose, US
217.214.157.68	AS3301 Telia Company AB	`0.52ms` from Stockholm, SE
92.204.186.4	AS29066 velia.net Internetdienste GmbH	`0.15ms` from Strasbourg, FR
114.25.155.132	AS3462 Data Communication Business Group	`2.30ms` from Taipei, TW
13.231.188.84	AS16509 Amazon.com, Inc.	`0.11ms` from Tokyo, JP
18.236.134.148	AS16509 Amazon.com, Inc.	`0.17ms` from Boardman, US
20.7.30.84	AS8075 Microsoft Corporation	`0.32ms` from Boydton, US
208.184.122.52	AS6461 Zayo Bandwidth	`0.33ms` from Dallas, US
45.229.228.4	AS267135 DL CENTER PROVEDOR DE INTERNET LTDA	`14.11ms` from Fortaleza, BR
167.103.21.180	AS53813 ZSCALER, INC.	`0.44ms` from Hyderabad, IN
195.208.164.244	AS34858 Telezon-Seti LLC	`0.27ms` from Krasnoyarsk, RU
132.251.229.164	AS27839 Comteco Ltda	`5.29ms` from La Paz, BO
200.37.128.36	AS6147 Telefonica del Peru S.A.A.	`1.19ms` from Lima, PE
130.35.113.68	AS31898 Oracle Corporation	`0.20ms` from London, GB

Traceroute

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

traceroute -a -n -q1 -f4 104.21.29.32

traceroute to 104.21.29.32 (104.21.29.32): 64 hops max, 52 byte packets

4 [AS13335] 172.69.220.2 0.784 ms

5 [AS13335] 104.21.29.32 0.155 ms

Measurement taken from

IPinfo ProbeNet in Luxembourg, LU

On October 25th 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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