How to Pull Non-Base Fields via REST API Get Method?

[#1]

I am currently using the following API call to pull the base fields and it works fine but when I try to add fields created manually, API unable to recognize the fields.I tried using the "_return_fields+" but not sure how to fit it in the below URL. Appreciate any insight.

https://dhcp.mycompany.net/wapi/v2.3.1/network?_max_results=10&_return_fields=network,comment

[#2]

The "+" needs to be encoded as %2b.  For example:

https://dhcp.mycompany.net/wapi/v2.3.1/network?_max_results=10&_return_fields%2b=network,comment

[#3 · Accepted solution]

All custom fields can be retrieved using 'extattrs' attribute.

Ref: https://community.infoblox.com/t5/api-integration-devops-netops/need-help-with-adding-a-custom-field...