When email marketers aren’t able to land emails in recipients’ inboxes, they miss valuable opportunities for engagement and growth. An IP reputation checker is like bug spray for email campaigns, helping them get past spam filters and onto the coveted inbox. But what is an IP reputation and how is it determined?

IP reputation and anonymity checker is a digital trustworthiness score that determines the credibility of an IP address based on its history in online activities. Similar to a credit score, it helps Internet service providers and email platforms assess risks linked to spam, phishing, or malware distribution. A higher IP reputation scores signal reliability, while a low score raises red flags and can trigger content filtering.

Check IPs for Suspicious Behavior and Anonymity Use

Many factors influence an IP reputation, such as the volume and type of traffic, if it is shared or dedicated, and if it contains viruses, open proxies, or misconfigured applications. Services like Google Postmaster Tools, Microsoft SNDS, and Sender Score assess these factors to calculate an IP reputation score. However, because these services are limited in scope, they cannot cover every potential source of risk.

To provide a comprehensive overview of an IP reputation, many paid reputation services offer APIs for automated reporting and blacklist monitoring. These services combine multiple data sources, including threat intelligence feeds, user feedback, and historical email data, to evaluate an IP address. Additionally, some services can integrate with third-party applications to poll data pipelines (like BigQuery or MXToolbox) and update a reputation score based on that information.