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: unknown

Internet Service Provider: 6to4 RFC3056

Hostname: unknown

Organization: unknown

Usage Type: Reserved

Comments:
Type Details Datetime
attackspam
2019-09-01 12:28:09 dovecot_login authenticator failed for (gdsxxxmjac.com) [2002:b66c:66d::b66c:66d]:55249 I=[2001:470:1f0f:3ad:bb:dcff:fe50:d900]:25: 535 Incorrect authentication data (set_id=ler@lerctr.org)
2019-09-01 12:28:35 dovecot_login authenticator failed for (gdsxxxmjac.com) [2002:b66c:66d::b66c:66d]:57849 I=[2001:470:1f0f:3ad:bb:dcff:fe50:d900]:25: 535 Incorrect authentication data (set_id=ler@lerctr.org)
2019-09-01 12:29:04 dovecot_login authenticator failed for (gdsxxxmjac.com) [2002:b66c:66d::b66c:66d]:59775 I=[2001:470:1f0f:3ad:bb:dcff:fe50:d900]:25: 535 Incorrect authentication data (set_id=ler@lerctr.org)
...
2019-09-02 08:26:04
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 2002:b66c:66d::b66c:66d
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 8025
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;2002:b66c:66d::b66c:66d.	IN	A

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019090101 1800 900 604800 86400

;; Query time: 7 msec
;; SERVER: 67.207.67.2#53(67.207.67.2)
;; WHEN: Mon Sep 02 08:25:55 CST 2019
;; MSG SIZE  rcvd: 127
Host info
Host d.6.6.0.c.6.6.b.0.0.0.0.0.0.0.0.0.0.0.0.d.6.6.0.c.6.6.b.2.0.0.2.ip6.arpa not found: 3(NXDOMAIN)
Nslookup info:
Server:		67.207.67.2
Address:	67.207.67.2#53

** server can't find d.6.6.0.c.6.6.b.0.0.0.0.0.0.0.0.0.0.0.0.d.6.6.0.c.6.6.b.2.0.0.2.ip6.arpa: NXDOMAIN
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2019-09-01 16:11:31

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