Is it possible to search WHOIS data by parameters such as: registrant name, registrant email, registrant zip/postal code?
No. If you search the Network Solutions WhoIs database, you only get 2 search options:
- By Domain Name
- By IP Address
If you search for a zip code like: "90210", it will try to lookup "90210.com". It won't search for all domains in the 90210 (Beverly Hills, CA) zip code.