191.53.104.51
Recent Activity
This IP has received recent abuse reports, which causes the score to increase.
- ISP
- MASTER S/A
- Usage Type
- Fixed Line ISP
- ASN
- AS28202
- Hostname(s)
- 191-53-104-51.vga-wr.mastercabo.com.br
- Domain Name
- mastercabo.com.br
- Country
- 🇧🇷 Brazil
- City
- Montes Claros, Minas Gerais
Abuse Reports
Total reports
17 from
13 distinct
reporters
First reported
Most recent report
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.
| Reporter | IoA Timestamp (UTC) | Comment | Categories |
|---|---|---|---|
| Anonymous |
Authentication failure
|
Brute-Force | |
| 🇬🇧 D3monite |
Attempted Brute Force (dovecot)
|
Brute-Force | |
| 🇩🇪 yitzhaq |
|
Brute-Force | |
| 🇫🇮 inlink.ltd |
SMTP AUTH attack
|
Brute-Force | |
| Anonymous |
Authentication failure
|
Brute-Force | |
| 🇧🇷 ICS Labs |
ICS Labs threat intelligence (ICS Feeds): Exploited Host. Last observed 2026-11-05 UTC.
|
Exploited Host | |
| Anonymous |
Authentication failure
|
Brute-Force | |
| 🇩🇪 FeG Deutschland |
Mail: - login with unknown user - bruteforce
|
Brute-Force | |
| Anonymous |
Failed login attempt detected by Fail2Ban in plesk-dovecot jail
|
Brute-Force | |
| 🇹🇭 thaizone.com |
Mail credential brute-force attack (SM3) #1
|
Email Spam Brute-Force | |
| Anonymous |
Authentication failure
|
Brute-Force | |
| 🇧🇪 dbelm |
RdpGuard detected brute-force attempt on IMAP
|
Brute-Force | |
| 🇫🇷 solution.it |
2026-11-01T07:10:00.636954+01:00 vps789997 dovecot: imap-login: Disconnected: Connection closed (auth failed, 2 attempts in 12 secs): user=<4c024962.90802>, method=PLAIN, rip=191.53.104.51, lip=51.77.194.251, TLS, session=<7Odm4DBfi6S/NWgz>
|
Brute-Force | |
| Anonymous |
6x Dovecot auth failed (on 6 different adresses)
|
Brute-Force | |
| 🇹🇷 Jova |
Part of a distributed password attack on a mail account (IMAP logins from many IPs).
|
Brute-Force |
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