81.172.241.76 is blacklisted, reported for spam, and brute force attacks
1 brute force attacks, last activity .
Status
| Service | Status | Updated | Next steps |
|---|---|---|---|
| Anti-Spam | Blacklisted | Oct 14, 2026 06:01:55 | Get Anti-Spam Plugin or API |
| SpamFireWall | Not in list | Oct 14, 2026 06:01:55 | |
| Security FireWall | Not in list | - | Get Security Plugin |
| Block Lists | Data loading | - | Use via API, Files & DNSBL |
| Type of attacks | Spam, BruteForce | ||
Abuse reports
| There are currently no abuse reports for this email/IP. Report Abuse activity |
Details
| Network | 81.172.128.0/17 |
|---|---|
| Network Spam Rate | – |
| DNS name | host-40.asd-bsr1-c.v4.dfn.nl |
| AS number | 15435 |
| Org name | DELTA Fiber Nederland B.V. |
| Location | Woerden, Utrecht, The Netherlands |
| IP Geolocation | lat: 52.0842; lon: 4.8805 |
| | |
| Address | - |
| Phone | - |
| Website | caiw.nl |
| AS spam rate | 1.33% |
| Websites hosted on 81.172.241.76 | Data loading |
Brute Force attacks log
| Date/time (GMT) | IP | Nickname | Event |
|---|---|---|---|
| Sep 23, 2026 13:57:00 | 81.172.241.76 | api-userap***** | invalid_username |
81.172.128.0/17 spam active IP addresses
| # | Address (DNS name) | Detected | Last seen | Attacked sites |
|---|---|---|---|---|
| 1 | 81.172.241.77 (host-00.asd-bsr1-c.v4.dfn.nl) | May 19, 2025 00:33:18 | Oct 14, 2026 11:18:26 | 3 |
| 2 | 81.172.241.76 (host-40.asd-bsr1-c.v4.dfn.nl) | Mar 02, 2026 01:36:51 | Oct 14, 2026 11:01:55 | 3 |
| 3 | 81.172.241.91 (host-q0.asd-bsr1-c.v4.dfn.nl) | Jan 15, 2026 19:37:50 | Oct 13, 2026 22:35:12 | 3 |
| 4 | 81.172.241.79 (host-y0.asd-bsr1-c.v4.dfn.nl) | May 23, 2025 16:16:36 | Oct 13, 2026 21:36:13 | 5 |
81.172.241.76 spam and brute force activity on date
| # | Date | IP | Frequency |
|---|
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Why is this 81.172.241.76 contacting my website?
This 81.172.241.76 may appear due to bots, crawlers, spam submissions, or automated attacks.
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Is this 81.172.241.76 safe?
It depends on the IP address status. If it is green and marked as "Not in lists", it is considered safe. If it is "Blacklisted" and shown in red, it means the IP has been involved in abusive activity such as spam, phishing, scam attacks, password brute-force attempts, or hacking attempts.
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How do I block 81.172.241.76?
Use one of our Anti-Spam plugins, the Security plugin, the Anti-Spam API, or the Block Lists API. If you are not sure which option to choose, please contact our support team: https://cleantalk.org/my/support/open
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Is this a bot or hacker?
It depends on the activity of the 81.172.241.76. If the Anti-Spam or Security plugins stop the attacks, it is most likely a bot. If they do not stop them, there is a high probability that it is a human attacker.
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What does "Blacklisted" mean?
It means the 81.172.241.76 is currently performing various types of spam and security attacks on websites.
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