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: China

Internet Service Provider: ChinaNet Guangdong Province Network

Hostname: unknown

Organization: unknown

Usage Type: unknown

Comments:
Type Details Datetime
attackspam
Aug  8 03:31:09 mxgate1 postfix/postscreen[6324]: CONNECT from [113.87.136.81]:23852 to [176.31.12.44]:25
Aug  8 03:31:09 mxgate1 postfix/dnsblog[6328]: addr 113.87.136.81 listed by domain zen.spamhaus.org as 127.0.0.11
Aug  8 03:31:09 mxgate1 postfix/dnsblog[6328]: addr 113.87.136.81 listed by domain zen.spamhaus.org as 127.0.0.3
Aug  8 03:31:10 mxgate1 postfix/postscreen[6324]: PREGREET 22 after 0.23 from [113.87.136.81]:23852: EHLO [113.87.136.81]

Aug  8 03:31:10 mxgate1 postfix/postscreen[6324]: DNSBL rank 2 for [113.87.136.81]:23852
Aug x@x
Aug  8 03:31:11 mxgate1 postfix/postscreen[6324]: HANGUP after 0.69 from [113.87.136.81]:23852 in tests after SMTP handshake
Aug  8 03:31:11 mxgate1 postfix/postscreen[6324]: DISCONNECT [113.87.136.81]:23852


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=113.87.136.81
2019-08-08 16:05:57
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 113.87.136.81
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 20707
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019080800 1800 900 604800 86400

;; Query time: 5 msec
;; SERVER: 67.207.67.2#53(67.207.67.2)
;; WHEN: Thu Aug 08 16:05:48 CST 2019
;; MSG SIZE  rcvd: 117
Host info
Host 81.136.87.113.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		67.207.67.2
Address:	67.207.67.2#53

** server can't find 81.136.87.113.in-addr.arpa: NXDOMAIN
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