Domain Finder
Find and register cold-email sending domains similar to a client's main domain, via Spaceship
Internal GK3 tool -- sending domains are GK3-owned infrastructure, not the client's own domain, so this is not shown to clients. Registering a domain is a real purchase, billed to GK3's Spaceship account.
Find similar domains
Enter a client's main domain to see close variants (short prefix/suffix, and optionally alt TLDs) and their live availability