2604:a940:300:5b6:0:4:: was found in our database!
This IP was reported 257 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:a940:300:5b6:0:4:: 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
257
times from
10 distinct
sources.
2604:a940:300:5b6:0:4:: 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.
2026-07-29T10:21:31.740268+02:00 srv03 postfix/submission/smtpd[135595]: improper command pipelining ...
show more2026-07-29T10:21:31.740268+02:00 srv03 postfix/submission/smtpd[135595]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:4::]: \026\003\001\005\306\001\000\005\302\003\003b\205\327m:\257m\264m\347\243\213\2242D\323W\242N\nd\240\305\037k\376\327\212m\022\371\331 \006I\025i@U\244o\334\330#\211v\353c\022I\340\241\256:\332aA3\364CY\315[ \337\000\032\300+\300/\300,\3000\314\251\314\250\300\t\300\023\300\n\300\024\023\001
2026-07-29T10:21:32.522248+02:00 srv03 postfix/submission/smtpd[135601]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:4::]: \026\003\001\000\312\001\000\000\306\003\003)|ZN=\355\355\351\265\006\315ecu.D\177a\005\020\273l\267B\235\221\323\372\342\252Z\224\000\000h\314\024\314\023\300/\300+\3000\300,\300\021\300\a\300'\300#\300\023\300\t\300(\300$\300\024\300\n\314\025\000\236\000\237\000g\000k\0003\0009\000\234\000\235\000\005\000\004
2026-07-29T10:21:32.725930+02:00 srv03 postfix/submission/smtpd[135595]: lost connect
...
show less
SMTP Bruteforce. 2026-07-29T10:08:45.351751+02:00 *.* postfix/submission/smtpd[857463]: improper com ...
show moreSMTP Bruteforce. 2026-07-29T10:08:45.351751+02:00 *.* postfix/submission/smtpd[857463]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:4::]: 026003001005306001000005302003003332342M317270271336016360232225Bg263215031I!261s371Ph2211254356327211310v303 207Hq037266e323n:,`312360247{216v022AM350K223003211313327327q%021246000032300+300/300,3000314251314250300t300023300n300024023001
2026-07-29T10:08:45.841013+02:00 *.* postfix/submission/smtpd[857463]: improper command pipelining after CONNECT from unknown[2604:a940:300:5b6:0:4::]: 026003001000312001000000306003003303[310216345i./mu364326266252016F0354aN230br&222a307202370250237347000000h314024314023300/300+3000300,300021300a300'300#300023300t300(300$300024300n314025000236000237000g000k00030009000234000235000005000004
show less
Blocked by UFW (TCP on 8083)
Source port: 56943
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 8083)
Source port: 56943
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 10187)
Source port: 53495
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 10187)
Source port: 53495
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 51007)
Source port: 54072
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 51007)
Source port: 54072
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 2496)
Source port: 53131
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 2496)
Source port: 53131
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 10010)
Source port: 54913
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 10010)
Source port: 54913
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 47693)
Source port: 50891
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 47693)
Source port: 50891
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 389)
Source port: 55462
Packet length: 60
This report (for 2604:a940:0300:05 ...
show moreBlocked by UFW (TCP on 389)
Source port: 55462
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 1028)
Source port: 54234
Packet length: 60
This report (for 2604:a940:0300:0 ...
show moreBlocked by UFW (TCP on 1028)
Source port: 54234
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Blocked by UFW (TCP on 20256)
Source port: 53277
Packet length: 60
This report (for 2604:a940:0300: ...
show moreBlocked by UFW (TCP on 20256)
Source port: 53277
Packet length: 60
This report (for 2604:a940:0300:05b6:0000:0004:0000:0000) was generated by:
https://github.com/sefinek/UFW-AbuseIPDB-Reporter
show less
Port Scan
Showing 1 to
15
of 257 reports
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reports reviewed and removed.
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