21.23.121.1 - IPInfo

Basic Info

City: unknown

Region: unknown

Country: United States

Internet Service Provider: unknown

Hostname: unknown

Organization: unknown

Usage Type: unknown

Comments:

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Comments on same subnet:

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Whois info:

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#



# start

NetRange:       21.0.0.0 - 21.255.255.255
CIDR:           21.0.0.0/8
NetName:        DNIC-SNET-021
NetHandle:      NET-21-0-0-0-1
Parent:          ()
NetType:        Direct Allocation
OriginAS:       
Organization:   United States Department of Defense (DoD) (USDDD)
RegDate:        1991-07-01
Updated:        2025-09-05
Ref:            https://rdap.arin.net/registry/ip/21.0.0.0



OrgName:        United States Department of Defense (DoD)
OrgId:          USDDD
Address:        3990 E. Broad Street
City:           Columbus
StateProv:      OH
PostalCode:     43218
Country:        US
RegDate:        2007-01-12
Updated:        2026-08-12
Ref:            https://rdap.arin.net/registry/entity/USDDD


OrgNOCHandle: MIL-HSTMST-ARIN
OrgNOCName:   Network DoD
OrgNOCPhone:  +1-844-347-2457 
OrgNOCEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgNOCRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgAbuseHandle: MIL-HSTMST-ARIN
OrgAbuseName:   Network DoD
OrgAbusePhone:  +1-844-347-2457 
OrgAbuseEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgTechHandle: REGIS10-ARIN
OrgTechName:   Registration
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/REGIS10-ARIN

OrgTechHandle: MIL-HSTMST-ARIN
OrgTechName:   Network DoD
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

# end


# start

NetRange:       21.0.0.0 - 21.255.255.255
CIDR:           21.0.0.0/8
NetName:        DNIC-SNET-021
NetHandle:      NET-21-0-0-0-2
Parent:         DNIC-SNET-021 (NET-21-0-0-0-1)
NetType:        Reallocated
OriginAS:       
Organization:   DoD Network Information Center (DNIC)
RegDate:        2025-09-05
Updated:        2025-09-05
Ref:            https://rdap.arin.net/registry/ip/21.0.0.0


OrgName:        DoD Network Information Center
OrgId:          DNIC
Address:        3990 E. Broad Street
City:           Columbus
StateProv:      OH
PostalCode:     43218
Country:        US
RegDate:        
Updated:        2026-11-09
Ref:            https://rdap.arin.net/registry/entity/DNIC


OrgTechHandle: MIL-HSTMST-ARIN
OrgTechName:   Network DoD
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgTechHandle: REGIS10-ARIN
OrgTechName:   Registration
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/REGIS10-ARIN

OrgAbuseHandle: REGIS10-ARIN
OrgAbuseName:   Registration
OrgAbusePhone:  +1-844-347-2457 
OrgAbuseEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
OrgAbuseRef:    https://rdap.arin.net/registry/entity/REGIS10-ARIN

# end



#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Dig info:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> 21.23.121.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 696
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;21.23.121.1.			IN	A

;; AUTHORITY SECTION:
.			30	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2026111100 1800 900 604800 86400

;; Query time: 30 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Wed Nov 11 21:50:34 CST 2026
;; MSG SIZE  rcvd: 104

Host info

Host 1.121.23.21.in-addr.arpa. not found: 3(NXDOMAIN)

Nslookup info:

Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 1.121.23.21.in-addr.arpa: NXDOMAIN

Related IP info:

Related comments:

IP	Type	Details	Datetime
139.59.46.243	attack	Sep 27 06:50:12 www2 sshd\[55676\]: Invalid user guest4 from 139.59.46.243Sep 27 06:50:15 www2 sshd\[55676\]: Failed password for invalid user guest4 from 139.59.46.243 port 35212 ssh2Sep 27 06:54:27 www2 sshd\[55954\]: Invalid user chao from 139.59.46.243 ...	2019-09-27 13:43:43
89.163.242.62	attackspam	Automated report (2019-09-27T03:54:13+00:00). Misbehaving bot detected at this address.	2019-09-27 13:55:44
140.143.22.200	attackspam	Sep 27 07:56:54 MK-Soft-VM7 sshd[5966]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=140.143.22.200 Sep 27 07:56:56 MK-Soft-VM7 sshd[5966]: Failed password for invalid user mysql from 140.143.22.200 port 40738 ssh2 ...	2019-09-27 14:07:56
78.139.200.51	attackbots	2019-09-26 22:54:15 H=user-78-139-200-51.tomtelnet.ru [78.139.200.51]:49676 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.11, 127.0.0.3) (https://www.spamhaus.org/query/ip/78.139.200.51) 2019-09-26 22:54:16 H=user-78-139-200-51.tomtelnet.ru [78.139.200.51]:49676 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.3, 127.0.0.11, 127.0.0.4) (https://www.spamhaus.org/sbl/query/SBLCSS) 2019-09-26 22:54:16 H=user-78-139-200-51.tomtelnet.ru [78.139.200.51]:49676 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.3, 127.0.0.11, 127.0.0.4) (https://www.spamhaus.org/sbl/query/SBLCSS) ...	2019-09-27 13:53:54
101.231.95.195	attackspam	Sep 27 07:35:55 markkoudstaal sshd[3597]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=101.231.95.195 Sep 27 07:35:58 markkoudstaal sshd[3597]: Failed password for invalid user placrim@1234 from 101.231.95.195 port 52085 ssh2 Sep 27 07:40:32 markkoudstaal sshd[4130]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=101.231.95.195	2019-09-27 13:48:59
67.184.64.224	attackspambots	Sep 27 07:13:39 meumeu sshd[28239]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=67.184.64.224 Sep 27 07:13:40 meumeu sshd[28239]: Failed password for invalid user pork from 67.184.64.224 port 59490 ssh2 Sep 27 07:17:56 meumeu sshd[28800]: Failed password for root from 67.184.64.224 port 45063 ssh2 ...	2019-09-27 13:47:35
197.48.123.243	attackbots	Chat Spam	2019-09-27 14:15:22
178.32.215.89	attackspambots	Sep 26 19:44:23 sachi sshd\[30215\]: Invalid user password from 178.32.215.89 Sep 26 19:44:23 sachi sshd\[30215\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=bg1.datarox.fr Sep 26 19:44:25 sachi sshd\[30215\]: Failed password for invalid user password from 178.32.215.89 port 35270 ssh2 Sep 26 19:47:58 sachi sshd\[30532\]: Invalid user jordan123 from 178.32.215.89 Sep 26 19:47:58 sachi sshd\[30532\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=bg1.datarox.fr	2019-09-27 14:07:28
104.248.157.14	attackbots	Sep 26 20:02:00 tdfoods sshd\[28959\]: Invalid user autocad from 104.248.157.14 Sep 26 20:02:00 tdfoods sshd\[28959\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.157.14 Sep 26 20:02:02 tdfoods sshd\[28959\]: Failed password for invalid user autocad from 104.248.157.14 port 44764 ssh2 Sep 26 20:07:03 tdfoods sshd\[29343\]: Invalid user hdduser from 104.248.157.14 Sep 26 20:07:03 tdfoods sshd\[29343\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.157.14	2019-09-27 14:14:40
77.247.110.214	attack	09/27/2019-05:54:09.682587 77.247.110.214 Protocol: 17 ET SCAN Sipvicious Scan	2019-09-27 14:01:03
34.80.136.93	attack	Sep 27 08:41:58 www2 sshd\[2862\]: Invalid user test from 34.80.136.93Sep 27 08:42:00 www2 sshd\[2862\]: Failed password for invalid user test from 34.80.136.93 port 57506 ssh2Sep 27 08:46:31 www2 sshd\[3365\]: Invalid user connor from 34.80.136.93 ...	2019-09-27 14:04:53
49.164.52.237	attackbots	B: zzZZzz blocked content access	2019-09-27 13:49:17
58.250.161.97	attackbotsspam	Sep 26 19:09:05 php1 sshd\[4475\]: Invalid user git5 from 58.250.161.97 Sep 26 19:09:05 php1 sshd\[4475\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=58.250.161.97 Sep 26 19:09:07 php1 sshd\[4475\]: Failed password for invalid user git5 from 58.250.161.97 port 2970 ssh2 Sep 26 19:14:25 php1 sshd\[5011\]: Invalid user oracle from 58.250.161.97 Sep 26 19:14:25 php1 sshd\[5011\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=58.250.161.97	2019-09-27 13:26:39
91.106.193.72	attack	Sep 27 07:16:24 ns41 sshd[27784]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=91.106.193.72	2019-09-27 13:59:01
80.211.9.57	attackbots	Sep 27 07:09:03 server sshd\[22135\]: Invalid user cmbc from 80.211.9.57 port 42512 Sep 27 07:09:03 server sshd\[22135\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=80.211.9.57 Sep 27 07:09:05 server sshd\[22135\]: Failed password for invalid user cmbc from 80.211.9.57 port 42512 ssh2 Sep 27 07:12:54 server sshd\[28244\]: Invalid user runa from 80.211.9.57 port 53200 Sep 27 07:12:54 server sshd\[28244\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=80.211.9.57	2019-09-27 14:10:35

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