404.html is a uncertain email domain

? Uncertain Classification

No clear categorization could be made for 404.html. This can have various reasons: The domain is new and doesn't yet have sufficient historical data, it's rarely used, or there's conflicting information from different data sources.

An uncertain classification doesn't automatically mean the domain is problematic. Many legitimate but less widespread email domains fall into this category, such as smaller companies, educational institutions, or regional providers. It's advisable to consider additional factors such as MX records, website status, and usage history.

Approach: For 404.html, you can apply a moderate security level. Email verification should be standard, but complete blocking is not necessary. Over time and with increasing usage, more data will become available that will allow for a more accurate classification.

Frequently Asked Questions about 404.html

💻 API Data

This is what our API returns for this domain:

{
  "domain": "404.html",
  "category": "unsure",
  "category_label": "Uncertain",
  "mx_count": 0,
  "has_website": false,
  "check_count": 31,
  "last_checked": "2026-04-14T21:51:01+02:00"
}

📊 Statistics

🕒 Recent Checks

Shows the last 5 checks with captured IP address.

ℹ Information

This data was collected and analyzed automatically. The classification is based on multiple data sources and may change.