Subdomains Beginning with an Underscore

Oct 13, 2025 by wbrum.org 119 views

Introduction

As a user of the Energized Pro website, you may have encountered an issue with the hostname check under the [Issue] tab. This check is designed to verify the validity of a hostname by performing a lookup. However, it appears that this feature does not function correctly when the input contains a dash - in the subdomain portion of the hostname. In this article, we will delve into the details of this issue and explore possible solutions.

The Issue

The hostname check on the https://energized.pro/ website fails to work correctly when the input contains a dash - in the subdomain portion of the hostname. This issue is not present when the dash is in the primary domain. The problem arises only when the hostname contains a dash at the subdomain level or lower.

To illustrate this issue, let's consider an example. Suppose we enter the hostname www-test.example.com in the hostname check field. In this case, the frontend of the website will not submit the query to do a lookup since the hostname contains a dash. However, if we enter a hostname with a dash in the primary domain, such as example-test.com, the lookup will be performed successfully.

Subdomains Beginning with an Underscore

In addition to the issue with dashes in subdomains, it has been reported that subdomains beginning with an underscore _ are not able to be looked up. This is another limitation of the hostname check feature on the Energized Pro website.

Possible Solutions

To resolve this issue, the developers of the Energized Pro website may need to modify the hostname check feature to handle subdomains containing dashes and underscores correctly. Here are a few possible solutions:

Modify the Regular Expression: The hostname check feature may be using a regular expression to validate the input hostname. The developers could modify this regular expression to allow for dashes and underscores in subdomains.
Use a More Robust Lookup Method: The current lookup method may be too restrictive and is causing the issue with dashes and underscores in subdomains. The developers could consider using a more robust lookup method that can handle a wider range of hostname formats.
Add Input Validation: The developers could add input validation to ensure that the hostname is in the correct format before performing the lookup. This could help prevent the issue with dashes and underscores in subdomains.

Conclusion

The hostname check feature on the Energized Pro website does not function correctly when the input contains a dash - in the subdomain portion of the hostname. This issue is not present when the dash is in the primary domain. Additionally, subdomains beginning with an underscore _ are not able to be looked up. To resolve this issue, the developers of the Energized Pro website may need to modify the hostname check feature to handle subdomains containing dashes and underscores correctly.

Recommendations

Based on the analysis of this issue, we recommend that the developers of the Energized Pro website take the following steps:

Modify the Regular Expression: Modify the regular expression used to validate the input hostname to allow for dashes and underscores in subdomains.
Use a More Robust Lookup Method: Consider using a more robust lookup method that can handle a wider range of hostname formats.
Add Input Validation: Add input validation to ensure that the hostname is in the correct format before performing the lookup.

By implementing these changes, the developers of the Energized Pro website can ensure that the hostname check feature functions correctly and provides a better user experience for their users.

Additional Information

For more information about this issue, please refer to the following resources:

Issue Submit Form

If you have encountered this issue or have any other concerns, please submit a report using the following form:

Issue(s):

Type x in between [ ] and make sure there isn't any space between brackets. Example; for Your Selected Issue(s), type like this - [x] You can select more than one category of issues if you need to!

[ ] unblock (remove from blocklist)
[ ] block (add to blocklist)
[ ] App/Website Broken
[ ] False/Positive
[ ] Request
[X] Other Issue

Details:

Please provide a detailed description of the issue you are experiencing, including any relevant information such as the hostname you are trying to look up and any error messages you may be seeing.

Contact Us

Q&A: Frequently Asked Questions

Q: What is the Energized Pro host check feature?

A: The Energized Pro host check feature is a tool on the Energized Pro website that allows users to verify the validity of a hostname by performing a lookup.

Q: Why does the host check feature not work correctly with subdomains containing dashes?

A: The host check feature on the Energized Pro website does not function correctly when the input contains a dash - in the subdomain portion of the hostname. This issue is not present when the dash is in the primary domain.

Q: What happens when I enter a hostname with a dash in the subdomain portion?

A: When you enter a hostname with a dash in the subdomain portion, the frontend of the website will not submit the query to do a lookup since the hostname contains a dash.

Q: Are subdomains beginning with an underscore `_` also affected?

A: Yes, subdomains beginning with an underscore _ are not able to be looked up.

Q: What are the possible solutions to this issue?

A: There are several possible solutions to this issue, including:

Modify the Regular Expression: Modify the regular expression used to validate the input hostname to allow for dashes and underscores in subdomains.
Use a More Robust Lookup Method: Consider using a more robust lookup method that can handle a wider range of hostname formats.
Add Input Validation: Add input validation to ensure that the hostname is in the correct format before performing the lookup.

Q: How can I report this issue?

A: If you have encountered this issue or have any other concerns, please submit a report using the issue submit form on the Energized Pro website.

Q: What information should I provide when reporting this issue?

A: When reporting this issue, please provide a detailed description of the issue you are experiencing, including any relevant information such as the hostname you are trying to look up and any error messages you may be seeing.

Q: How can I contact the Energized Pro team for further assistance?

A: If you have any questions or concerns about this issue or any other topic related to the Energized Pro website, please do not hesitate to contact us. We are here to help and look forward to hearing from you.

Q: Will the Energized Pro team fix this issue?

A: Yes, the Energized Pro team is committed to resolving this issue and ensuring that the host check feature functions correctly. We appreciate your patience and understanding as we work to resolve this issue.

Q: When can I expect the issue to be fixed?

A: We are working to resolve this issue as soon as possible. However, the exact timeline for resolution is not yet available. We will provide updates on the status of this issue as more information becomes available.

Q: Can I help with the resolution of this issue?

A: Yes, if you have any suggestions or ideas for resolving this issue, please do not hesitate to share them with us. We appreciate any feedback or input that can help us resolve this issue more efficiently.