V4Escrow

V4Escrow facilitates buying and selling IPv4 addresses and AS numbers, registered with ARIN, APNIC, and RIPE NCC. Put simply, it is about building software for you when nothing off the shelf fits.

Who is it for? Mostly companies with a specific process to automate. Related areas on their profile: Software Engineering. As a very small company team themselves (1 to 10 people), they tend to serve customers of a similar scale best. You will probably talk to the people who build it, which is great until you need 24/7 support.

V4Escrow is based in Henderson, Nevada. Their site is v4escrow.com.

Things worth asking about: portfolio relevance, who owns the code, and how they handle changes. Ask for a trial on your own data, not a canned demo.

Every review on Revaw shows how it was verified, so if you know V4Escrow well, your review carries weight here.