Why do some IPs on SenderScore have different data ranges?
Michael Ko
Co-founder & CEO, Suped
Published 2 Jul 2025
Updated 16 Aug 2025
5 min read
When delving into the intricacies of email deliverability, you might consult various tools to gauge your sending reputation. One prominent tool is SenderScore, which provides a reputation metric for your sending IP address, typically ranging from 0 to 100. It calculates this score based on a rolling 30-day average of various sending behaviors.
However, a common observation is that when you check different IP addresses on the SenderScore website, some display data for a 30-day period, while others show data stretching back six months or even a year. This discrepancy can be puzzling, especially when trying to understand your full reputation history.
The mechanics of SenderScore data
The core of SenderScore's methodology involves aggregating vast amounts of email traffic data. Validity, the company behind SenderScore, collects data from over 100 mailbox providers globally and its own proprietary data network. This aggregated information feeds into their algorithm, which then assigns a score from 0 to 100, reflecting your IP's trustworthiness over a typical rolling 30-day period.
The amount and depth of data available for a specific IP address are heavily influenced by the volume of email it sends. IPs that consistently send high volumes of email provide a steady stream of data points, allowing reputation systems to build a more robust and longer-term historical profile. This consistent data flow makes it easier for the system to display extended data ranges, sometimes showing six months or more of activity.
Conversely, IPs with very low or inconsistent sending volumes might not generate enough data to populate a full historical view. In such cases, SenderScore may only display the most recent 30 days of available data, even if the IP has been active for a longer time. The absence of sufficient, continuous traffic prevents the system from confidently presenting older data points.
Furthermore, the type of data collected can also vary. Factors like spam complaints, bounces, and engagement rates (opens and clicks, if available) are all factored in. The consistency of these metrics contributes to the reliability of the historical data presented for any given IP.
Factors affecting data range visibility
One of the most significant factors influencing the data range displayed is whether an IP address is dedicated or shared. The nature of how these IPs are used directly impacts the continuity and aggregation of reputation data.
Dedicated IP addresses are exclusively used by a single sender. This means all email traffic originating from that IP is attributed to one entity, making the data collection straightforward and continuous. This allows reputation services to build a long, unbroken history of sending behavior, which can be reflected in an extended data range.
Dedicated IP addresses
When you use a dedicated IP, your sending reputation is entirely your own. Your email volume and sending behavior directly influence the data collected.
This often results in more consistent and complete historical data on reputation monitoring services like SenderScore, assuming a steady sending volume.
Shared IP addresses
With shared IPs, your traffic is mixed with other senders. The collective sending behavior of all users on that IP impacts its overall reputation.
If other senders on a shared IP have inconsistent or low volume, or if the IP is frequently reallocated, the public data range might appear shorter or less consistent, as explained by Mailjet regarding sender reputation.
Even for the same email service provider (ESP), different clients might be using various types of IPs, leading to differing data ranges. For example, some ESPs might allocate specific IP ranges for high-volume, enterprise clients versus lower-volume or new senders, impacting how deeply and consistently reputation data is tracked and displayed.
Interpreting reported discrepancies
It's crucial to understand that the data presented on public tools like SenderScore is often a subset of the total information available to mailbox providers (ISPs). ISPs like Twilio explains IP reputation often maintain their own extensive internal data on sending IPs and domains, sometimes spanning years, which isn't publicly accessible.
Therefore, a 30-day displayed range doesn't necessarily mean that's all the historical data that exists. It often signifies the publicly available or most relevant recent data that SenderScore chooses to present. This can be influenced by the volume of emails the IP has been sending within that timeframe or the freshness of the data points.
Additionally, the algorithms used by various blocklist (or blacklist) providers and ISPs for assessing IP and domain reputation are proprietary and diverse. This means that an IP's reputation might look different across various tools or directly at an ISP level versus on SenderScore. For example, some private blacklists may retain records of poor sending practices for much longer, regardless of public scores.
It's also possible that an IP address you are checking is part of a broader IP range or network, and the data displayed is an aggregation that reflects the overall reputation of that entire range, which can sometimes lead to unexpected or seemingly inaccurate SenderScore data for a single IP. This aggregated view can mask individual IP performance.
Don't rely on one metric
While SenderScore is a valuable tool, it's just one data point. To get a comprehensive view of your email deliverability, you should monitor multiple aspects, including domain reputation, DMARC reports, and blocklist status. A single low score or short data range on one platform doesn't necessarily doom your entire email program.
Key takeaways for deliverability
Ultimately, the variance in data ranges on SenderScore highlights the dynamic nature of email reputation. It’s not a static number, but rather a reflection of ongoing sending practices and the complex web of data collection by various entities.
Focusing on consistent, high-quality email sending practices, maintaining a clean mailing list, and adhering to authentication standards like DMARC, SPF, and DKIM will always be the most effective way to ensure good email deliverability, regardless of minor fluctuations or discrepancies in external reputation reports.
Views from the trenches
Best practices
Maintain consistent sending volume to build robust IP reputation history.
Segment email types across different IP addresses to avoid reputation contamination.
Regularly monitor your IP and domain reputation across multiple platforms, not just one.
Common pitfalls
Sending inconsistent email volumes, leading to sparse or short-term reputation data.
Ignoring discrepancies in reputation data across different monitoring tools.
Failing to warm up new IP addresses properly, which can affect early data ranges.
Expert tips
Even if SenderScore only shows 30 days, major mailbox providers often retain much deeper historical data.
High-volume ESP IPs are typically tracked with greater granularity due to their impact on the email ecosystem.
If your IP is part of a large shared pool, its individual data visibility may be affected by the overall pool's behavior.
Expert view
Expert from Email Geeks says: Larger ESPs and ISPs might track historical data for high-volume or key IP addresses for extended periods, potentially longer than the publicly displayed 30-day average.
2023-03-07 - Email Geeks
Marketer view
Marketer from Email Geeks says: The difference in data ranges could indicate that some IPs simply don't have a full six months or a year of consistent data available for the system to display.
Validity, the company behind SenderScore, collects data from over 100 mailbox providers globally and its own proprietary data network. This aggregated information feeds into their algorithm, which then assigns a score from 0 to 100, reflecting your IP's trustworthiness over a typical rolling 30-day period.
