Must be a valid IPv4 or IPv6 ip address, e.g. 127.0.0.1 or 2001:DB8:0:0:8:800:200C:417A
Basic Info

City: unknown

Region: unknown

Country: Germany

Internet Service Provider: unknown

Hostname: unknown

Organization: unknown

Usage Type: unknown

Comments:
No discussion about this IP yet. Click above link to make one.
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
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Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 53.166.21.5
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 14838
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;53.166.21.5.			IN	A

;; AUTHORITY SECTION:
.			278	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2021122501 1800 900 604800 86400

;; Query time: 19 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Sun Dec 26 11:49:25 CST 2021
;; MSG SIZE  rcvd: 104
Host info
Host 5.21.166.53.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 5.21.166.53.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
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$f2bV_matches
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Brute force attempt
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23/tcp
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6241/tcp 445/tcp
[2020-06-18/22]2pkt
2020-06-23 05:23:19
49.235.217.169 attackspambots
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Jun 22 21:36:33 rocket sshd[27105]: Failed password for admin from 49.235.217.169 port 44714 ssh2
...
2020-06-23 05:32:34
222.240.1.0 attackbotsspam
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Jun 22 23:40:27 PorscheCustomer sshd[14329]: Failed password for root from 222.240.1.0 port 25459 ssh2
...
2020-06-23 05:50:17
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Brute force attempt
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138.197.5.191 attackbots
2020-06-22T23:50:58.060576lavrinenko.info sshd[31432]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=138.197.5.191
2020-06-22T23:50:58.053883lavrinenko.info sshd[31432]: Invalid user army from 138.197.5.191 port 37052
2020-06-22T23:51:00.089413lavrinenko.info sshd[31432]: Failed password for invalid user army from 138.197.5.191 port 37052 ssh2
2020-06-22T23:54:01.026757lavrinenko.info sshd[31624]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=138.197.5.191  user=root
2020-06-22T23:54:03.176253lavrinenko.info sshd[31624]: Failed password for root from 138.197.5.191 port 36400 ssh2
...
2020-06-23 05:23:39
71.6.232.5 attack
137/tcp 135/tcp 19/tcp...
[2020-04-22/06-22]283pkt,11pt.(tcp),1pt.(udp)
2020-06-23 05:11:51

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