IP reputation is a trust score assigned to an IP address based on its historical activity. Security systems, email providers, and web services check an IP's reputation before deciding whether to allow, flag, or block incoming traffic. An IP with a poor reputation is associated with spam, malware, attacks, or other abuse.
What Affects IP Reputation
| Factor | Effect on Reputation |
|---|---|
| Sending spam or phishing emails | Major negative — causes blacklisting |
| Hosting malware or C2 servers | Severe — flagged by all major threat intel feeds |
| Participating in DDoS attacks | Negative — IP added to abuse databases |
| Being part of a VPN or proxy service | Moderate — some services block known VPN exit IPs |
| Shared hosting with abusive neighbours | Negative — shared IPs inherit each other's reputation |
| No abuse history | Neutral to positive reputation |
How IP Reputation Is Used
- Email delivery — Gmail, Outlook, and other providers check sender IP reputation before accepting messages. Poor reputation means your email lands in spam or gets rejected.
- Web application firewalls — Block requests from IPs with a known attack history.
- Content delivery networks — Flag or rate-limit traffic from suspicious IP ranges.
- Ad platforms — Block conversions from IPs associated with click fraud.
How to Check and Fix Your IP Reputation
- Use our Blacklist Check to see if your IP appears on major blacklists
- Check abuse databases like AbuseIPDB and Spamhaus
- If blacklisted, identify and stop the abusive activity, then follow each blacklist's delisting process
- Contact your ISP if your IP was flagged for activity you did not initiate — it may indicate a compromised device
People Also Ask
- Can my IP reputation affect my business?
- Yes significantly. If your server's IP has a poor reputation, your transactional emails (receipts, password resets) will be marked as spam or rejected. Customers will not receive them. Marketing emails will have low deliverability. Some payment processors and fraud prevention tools also flag orders from low-reputation IPs.
- Does a VPN give me a bad IP reputation?
- It depends on the VPN provider. Many VPN exit IPs are listed in commercial databases that streaming services, banks, and some websites use to detect and block VPN traffic. Using a reputable VPN with a dedicated IP gives you much better reputation control.
Related: IP blacklist | DNSBL | Blacklist Check