21.166.99.51 - 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:

Dig info:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> 21.166.99.51
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 17097
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;21.166.99.51.			IN	A

;; AUTHORITY SECTION:
.			30	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2025071201 1800 900 604800 86400

;; Query time: 14 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Sun Jul 13 11:08:20 CST 2025
;; MSG SIZE  rcvd: 105

Host info

Host 51.99.166.21.in-addr.arpa. not found: 3(NXDOMAIN)

Nslookup info:

Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 51.99.166.21.in-addr.arpa: NXDOMAIN

Related IP info:

Related comments:

IP	Type	Details	Datetime
69.94.131.33	attack	Apr 19 05:39:16 mail.srvfarm.net postfix/smtpd[443325]: NOQUEUE: reject: RCPT from unknown[69.94.131.33]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo= Apr 19 05:39:16 mail.srvfarm.net postfix/smtpd[439139]: NOQUEUE: reject: RCPT from unknown[69.94.131.33]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo= Apr 19 05:39:16 mail.srvfarm.net postfix/smtpd[441854]: NOQUEUE: reject: RCPT from unknown[69.94.131.33]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo= Apr 19 05:39:16 mail.srvfarm.net postfix/smtpd[439137]: NOQUEUE: reject: RCPT	2020-04-19 13:11:54
142.93.223.25	attackspam	Invalid user ubuntu from 142.93.223.25 port 55458	2020-04-19 13:28:30
68.183.236.92	attack	Apr 19 04:24:26 sshgateway sshd\[32156\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=68.183.236.92 user=root Apr 19 04:24:28 sshgateway sshd\[32156\]: Failed password for root from 68.183.236.92 port 49678 ssh2 Apr 19 04:30:16 sshgateway sshd\[32176\]: Invalid user admin from 68.183.236.92	2020-04-19 12:58:48
222.186.31.83	attackspambots	Apr 19 07:28:59 vmd38886 sshd\[6778\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.31.83 user=root Apr 19 07:29:01 vmd38886 sshd\[6778\]: Failed password for root from 222.186.31.83 port 48004 ssh2 Apr 19 07:29:04 vmd38886 sshd\[6778\]: Failed password for root from 222.186.31.83 port 48004 ssh2	2020-04-19 13:32:35
120.132.13.206	attackspam	Apr 19 00:25:19 ny01 sshd[13364]: Failed password for root from 120.132.13.206 port 53888 ssh2 Apr 19 00:29:14 ny01 sshd[14041]: Failed password for root from 120.132.13.206 port 45080 ssh2	2020-04-19 13:29:45
14.29.232.45	attackbotsspam	Apr 19 07:04:53 ncomp sshd[4117]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=14.29.232.45 user=root Apr 19 07:04:55 ncomp sshd[4117]: Failed password for root from 14.29.232.45 port 42108 ssh2 Apr 19 07:20:06 ncomp sshd[4461]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=14.29.232.45 user=root Apr 19 07:20:08 ncomp sshd[4461]: Failed password for root from 14.29.232.45 port 53807 ssh2	2020-04-19 13:36:59
185.50.149.16	attackspambots	Apr 19 06:24:01 mail.srvfarm.net postfix/smtpd[457010]: warning: unknown[185.50.149.16]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 06:24:01 mail.srvfarm.net postfix/smtpd[457010]: lost connection after AUTH from unknown[185.50.149.16] Apr 19 06:24:06 mail.srvfarm.net postfix/smtpd[457172]: lost connection after AUTH from unknown[185.50.149.16] Apr 19 06:24:10 mail.srvfarm.net postfix/smtpd[457010]: lost connection after AUTH from unknown[185.50.149.16] Apr 19 06:24:15 mail.srvfarm.net postfix/smtpd[456876]: lost connection after AUTH from unknown[185.50.149.16]	2020-04-19 13:10:50
185.50.149.2	attack	Apr 19 07:01:59 relay postfix/smtpd\[32177\]: warning: unknown\[185.50.149.2\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 07:10:36 relay postfix/smtpd\[9604\]: warning: unknown\[185.50.149.2\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 07:10:52 relay postfix/smtpd\[15100\]: warning: unknown\[185.50.149.2\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 07:12:47 relay postfix/smtpd\[14024\]: warning: unknown\[185.50.149.2\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 07:12:48 relay postfix/smtpd\[4100\]: warning: unknown\[185.50.149.2\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 ...	2020-04-19 13:13:27
142.93.193.47	attack	[2020-04-19 00:39:26] NOTICE[1170][C-00001f74] chan_sip.c: Call from '' (142.93.193.47:54507) to extension '901146406820514' rejected because extension not found in context 'public'. [2020-04-19 00:39:26] SECURITY[1184] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-04-19T00:39:26.132-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="901146406820514",SessionID="0x7f6c08341c08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/142.93.193.47/54507",ACLName="no_extension_match" [2020-04-19 00:40:20] NOTICE[1170][C-00001f75] chan_sip.c: Call from '' (142.93.193.47:57474) to extension '801146406820514' rejected because extension not found in context 'public'. [2020-04-19 00:40:20] SECURITY[1184] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-04-19T00:40:20.233-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="801146406820514",SessionID="0x7f6c08341c08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/ ...	2020-04-19 12:55:23
180.76.136.211	attack	Apr 19 10:09:24 gw1 sshd[775]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.136.211 Apr 19 10:09:26 gw1 sshd[775]: Failed password for invalid user wd from 180.76.136.211 port 34456 ssh2 ...	2020-04-19 13:27:58
82.208.133.133	attack	Apr 19 03:55:46 ws25vmsma01 sshd[34355]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=82.208.133.133 Apr 19 03:55:48 ws25vmsma01 sshd[34355]: Failed password for invalid user oracle from 82.208.133.133 port 35904 ssh2 ...	2020-04-19 12:58:02
220.76.205.178	attackspambots	Apr 19 06:59:22 [host] sshd[15310]: Invalid user t Apr 19 06:59:22 [host] sshd[15310]: pam_unix(sshd: Apr 19 06:59:24 [host] sshd[15310]: Failed passwor	2020-04-19 13:33:04
150.109.17.222	attack	Fail2Ban Ban Triggered (2)	2020-04-19 13:04:49
118.89.191.145	attackbots	Fail2Ban - SSH Bruteforce Attempt	2020-04-19 13:14:56
141.98.80.30	attackbotsspam	Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[82653]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[81971]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[82653]: lost connection after AUTH from unknown[141.98.80.30] Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[81971]: lost connection after AUTH from unknown[141.98.80.30] Apr 19 06:38:54 web01.agentur-b-2.de postfix/smtpd[82653]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Apr 19 06:38:54 web01.agentur-b-2.de postfix/smtpd[81971]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6	2020-04-19 13:14:25

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