2604:a940:300:5b6:0:21:: was found in our database!
This IP was reported 234 times. Confidence of
Abuse
is 0%: ?
0%
Important Note: Public IPv6 addresses may implement the SLAAC
privacy extension. With this, the interface identifier is randomly generated. The SLAAC
privacy extension also implements a time out, which is configurable, so that the IPv6
interface addresses will be discarded and a new interface identifier is generated.
IP info including ISP, Usage Type, and Location provided
by IPInfo. Updated weekly.
Important Note: 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".
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.
This IP address has been reported a total of
234
times from
8 distinct
sources.
2604:a940:300:5b6:0:21:: was first reported on
, and the most recent report was
.
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 9000)
Source port: 55412
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 9000)
Source port: 55412
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 9092)
Source port: 55741
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 9092)
Source port: 55741
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 38080)
Source port: 54656
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 38080)
Source port: 54656
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. 2026-07-28T08:52:35.845405+02:00 *.* postfix/submission/smtpd[3852830]: improper co ...
show moreSMTP Bruteforce. 2026-07-28T08:52:35.845405+02:00 *.* postfix/submission/smtpd[3852830]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:21::]: 026003001005306001000005302003003300214236324-327217226327320347'+246p%334033R347311GXS203371276f027006=300 334027001K+jHnB257223341336212t201%3562212550212350268023204:[N4K242000032300+300/300,3000314251314250300t300023300n300024023001
2026-07-28T08:52:36.341810+02:00 *.* postfix/submission/smtpd[3852830]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:21::]: 026003001000312001000000306003003324+317030215002[j223O335361237v271336277./334333_Y267326367313DW^'$000000h314024314023300/300+3000300,300021300a300'300#300023300t300(300$300024300n314025000236000237000g000k00030009000234000235000005000004
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Blocked by UFW (TCP on 111)
Source port: 50051
Packet length: 60
This report (for 2604:a940:0300:05 ...
show moreBlocked by UFW (TCP on 111)
Source port: 50051
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 111)
Source port: 53788
Packet length: 60
This report (for 2604:a940:0300:05 ...
show moreBlocked by UFW (TCP on 111)
Source port: 53788
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 3306)
Source port: 52380
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 3306)
Source port: 52380
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
Port Scan
SQL Injection
Anonymous
2026-07-27T10:01:45.472256+02:00 mx1 postfix/submission/smtpd[938466]: improper command pipelining a ...
show more2026-07-27T10:01:45.472256+02:00 mx1 postfix/submission/smtpd[938466]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:21::]: GET / HTTP/1.1\r\nHost: [[***]]:587\r\nUser-Agent: Hello from Palo Alto Networks, find ou
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Blocked by UFW (TCP on 110)
Source port: 52329
Packet length: 60
This report (for 2604:a940:0300:05 ...
show moreBlocked by UFW (TCP on 110)
Source port: 52329
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 9983)
Source port: 52227
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 9983)
Source port: 52227
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 32400)
Source port: 51740
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 32400)
Source port: 51740
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 52869)
Source port: 50516
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 52869)
Source port: 50516
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 8800)
Source port: 51810
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 8800)
Source port: 51810
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 22)
Source port: 51048
Packet length: 60
This report (for 2604:a940:0300:05b ...
show moreBlocked by UFW (TCP on 22)
Source port: 51048
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: 50060
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 61616)
Source port: 50060
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
Port Scan
Showing 1 to
15
of 234 reports
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reports reviewed and removed.
Request Takedown 🚩