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: United States

Internet Service Provider: DigitalOcean LLC

Hostname: unknown

Organization: unknown

Usage Type: Data Center/Web Hosting/Transit

Comments:
Type Details Datetime
attack
Jul  1 07:22:49 our-server-hostname postfix/smtpd[3562]: connect from unknown[104.248.39.234]
Jul  1 07:22:50 our-server-hostname postfix/smtpd[3562]: NOQUEUE: reject: RCPT from unknown[104.248.39.234]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from=x@x helo=
Jul  1 07:22:51 our-server-hostname postfix/smtpd[3562]: lost connection after RCPT from unknown[104.248.39.234]
Jul  1 07:22:51 our-server-hostname postfix/smtpd[3562]: disconnect from unknown[104.248.39.234]
Jul  1 07:30:46 our-server-hostname postfix/smtpd[8511]: connect from unknown[104.248.39.234]
Jul  1 07:30:47 our-server-hostname postfix/smtpd[8511]: NOQUEUE: reject: RCPT from unknown[104.248.39.234]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from=x@x proto=ES
.... truncated .... 
ect from unknown[104.248.39.234]
Jul  1 08:22:35 our-server-hostname postfix/smtpd[30038]: connect from unknown[104.248.39.234]
Jul  1 08:22:36 our-server-hostname p........
-------------------------------
2019-07-08 08:40:29
Comments on same subnet:
IP Type Details Datetime
104.248.39.14 attackspam
Lines containing failures of 104.248.39.14
Mar  9 23:05:46 shared10 sshd[10973]: Invalid user cpaneleximscanner from 104.248.39.14 port 60770
Mar  9 23:05:46 shared10 sshd[10973]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.39.14
Mar  9 23:05:48 shared10 sshd[10973]: Failed password for invalid user cpaneleximscanner from 104.248.39.14 port 60770 ssh2
Mar  9 23:05:48 shared10 sshd[10973]: Received disconnect from 104.248.39.14 port 60770:11: Bye Bye [preauth]
Mar  9 23:05:48 shared10 sshd[10973]: Disconnected from invalid user cpaneleximscanner 104.248.39.14 port 60770 [preauth]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=104.248.39.14
2020-03-10 07:29:19
104.248.39.213 attack
104.248.39.213 - - [14/Apr/2019:21:20:52 +0800] "POST /GponForm/diag_Form?images/ HTTP/1.1" 400 182 "-" "Hello, World"
2019-04-14 21:21:51
Whois info:
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Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 104.248.39.234
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 18509
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;104.248.39.234.			IN	A

;; AUTHORITY SECTION:
.			2813	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019070701 1800 900 604800 86400

;; Query time: 1 msec
;; SERVER: 67.207.67.2#53(67.207.67.2)
;; WHEN: Mon Jul 08 08:40:23 CST 2019
;; MSG SIZE  rcvd: 118
Host info
Host 234.39.248.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		67.207.67.2
Address:	67.207.67.2#53

** server can't find 234.39.248.104.in-addr.arpa: NXDOMAIN
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