Neutral Activity
There is no recent abuse activity, or the IP address is whitelisted.
Whitelisted Subnet
Whitelisted netblocks are typically owned by trusted entities, such as Google or Microsoft who
may use them for search engine spiders. However, these same entities sometimes also provide cloud
servers and mail services which are easily abused. Pay special attention when trusting or
distrusting these IPs.
IPv6 SLAAC Note
Public IPv6 addresses may implement the SLAAC
privacy extension. With SLAAC, the interface identifier is randomly generated. SLAAC also implements a
configurable time out, so that the original IPv6 interface addresses will be discarded in favor of a new
interface identifier.
2604:a940:300:5b6:0:21:: is an IP address from within our whitelist belonging to the subnet
2604:a940:300:5b6::/64,
which we identify as "Cortex Xpanse".
This IP address has been reported a total of
453
times from
11 distinct
sources.
2604:a940:300:5b6:0:21:: was first reported on
, and the most recent report was
.
In the last 60 days, the top reporter locations were:
United States of America
with 155
reports;
Germany
with 35
reports;
Netherlands
with 1
report.
The most common categories in these recent reports were:
Port Scan
177
times;
Brute-Force
35
times;
Email Spam
4
times;
Web App Attack
4
times;
Hacking
1
time;
Other
1
time.
Recent Reports
We have received reports of abusive activity from this IP address within the last week. It is
potentially still actively engaged in abusive activities.
Blocked by UFW (TCP on 10000)
Source port: 54104
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 10000)
Source port: 54104
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 6568)
Source port: 53295
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 6568)
Source port: 53295
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 7001)
Source port: 51388
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 7001)
Source port: 51388
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 8159)
Source port: 50882
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 8159)
Source port: 50882
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 30010)
Source port: 49698
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 30010)
Source port: 49698
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 17778)
Source port: 55208
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 17778)
Source port: 55208
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 61616)
Source port: 55490
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 61616)
Source port: 55490
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 30006)
Source port: 51235
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 30006)
Source port: 51235
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 3909)
Source port: 54354
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 3909)
Source port: 54354
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 4786)
Source port: 56223
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 4786)
Source port: 56223
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 2525)
Source port: 50147
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 2525)
Source port: 50147
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
SMTP Bruteforce. 2026-09-30T08:38:06.906229+02:00 *.* postfix/submission/smtpd[3914972]: improper co ...
show moreSMTP Bruteforce. 2026-09-30T08:38:06.906229+02:00 *.* postfix/submission/smtpd[3914972]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:21::]: 026003001005306001000005302003003M3413262233259300275}kf277R40169I*m304214300NJUT0037307o364003 cV356w]261Ut336005224361/K244Z241245n212U<tW256260026#220177202B000032300+300/300,3000314251314250300t300023300n300024023001
2026-09-30T08:38:07.468862+02:00 *.* postfix/submission/smtpd[3914972]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:21::]: 026003001000312001000000306003003f210^206341r250302226227374l217307232Z266307x307220331343263376002iO004#Z034000000h314024314023300/300+3000300,300021300a300'300#300023300t300(300$300024300n314025000236000237000g000k00030009000234000235000005000004
show less
Brute-Force
Anonymous
2026-09-30T08:38:02.327187+02:00 mx1 postfix/submission/smtpd[29348]: improper command pipelining af ...
show more2026-09-30T08:38:02.327187+02:00 mx1 postfix/submission/smtpd[29348]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:21::]: \026\003\001\005\306\001\000\005\302\003\003\224\265\221m\3747EOy\205\271\3123\372\004\364\313.K9\360\230-\202j\000O\030\025\221\207\261 E*\330\246\307-v[\213u\257L3Y\037\227\332o\f\246y\b\246\211\361\374\364JF*c\256\000\032\300+\300/\300,\3000\314\251\314\250\300\t\300\023\300\n\300\024\023\001
show less
Blocked by UFW (TCP on 30006)
Source port: 52610
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 30006)
Source port: 52610
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0021:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
