27.13.28.4
Neutral Activity
There is no recent abuse activity, or the IP address is whitelisted.
- ISP
- China Unicom Chongqing Province Network
- Usage Type
- Fixed Line ISP
- ASN
- AS4837
- Domain Name
- chinaunicom.cn
- Country
- 🇨🇳 China
- City
- Chongqing, Chongqing
No reports in the last 60 days
27.13.28.4 has been reported 56 times. The most recent report is from .
The full history is preserved below and remains searchable. A 0% score reflects the absence of recent activity, but this is not a guarantee that earlier reports were invalid. Abuse confidence score decays, naturally, over time, when the abusive activity stops.
Abuse Reports
Total reports
56 from
40 distinct
reporters
First reported
Most recent report
| Reporter | IoA Timestamp (UTC) | Comment | Categories |
|---|---|---|---|
| 🇹🇷 rtbh.com.tr |
list.rtbh.com.tr report: tcp/0
|
Brute-Force | |
| 🇩🇪 Paul Smith |
Email Auth Brute force attack 7/7 in last day
|
Brute-Force | |
| 🇹🇷 rtbh.com.tr |
list.rtbh.com.tr report: tcp/0
|
Brute-Force | |
| 🇯🇵 ki3 |
Fail2Ban: Postfix Attack 27.13.28.4 1770316741.0(JST)
|
Email Spam Brute-Force | |
| Anonymous |
SMTP brute force - auth failed
|
Brute-Force Exploited Host | |
| Anonymous |
Failed login attempt detected by Fail2Ban in plesk-postfix jail
|
Brute-Force | |
| 🇹🇭 thaizone.com |
Mail credential brute-force attack (SM5) #1
|
Email Spam Brute-Force | |
| 🇮🇩 xveil |
2026-02-05T22:36:49.732577 mail-honeypot postfix/submission/smtpd[14378]: warning: unknown[27.13.28.4]: SASL LOGIN authentication failed: authentication failure
...
|
Brute-Force | |
| 🇸🇪 triplecode |
Reported from hMailServer
|
Email Spam | |
| 🇹🇭 thaizone.com |
Mail credential brute-force attack (SMG1 [2]) #1
|
Email Spam Brute-Force | |
| 🇬🇧 killian7603 |
Logon Policy Violation
|
Email Spam Spoofing Brute-Force | |
| 🇩🇪 Paul Smith |
Email Auth Brute force attack 1/1 in last day
|
Brute-Force | |
| 🇮🇩 xveil |
2026-02-05T12:46:42.890891 mail-honeypot postfix/submission/smtpd[12654]: warning: unknown[27.13.28.4]: SASL LOGIN authentication failed: authentication failure
...
|
Brute-Force | |
| 🇮🇩 xveil |
2026-02-05T10:59:47.883945 mail-honeypot postfix/submission/smtpd[21992]: warning: unknown[27.13.28.4]: SASL LOGIN authentication failed: authentication failure
...
|
Brute-Force | |
| 🇩🇪 chris_yooo |
|
Spoofing Brute-Force |
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