Email blocklist · DNSBL · IP addresses
TUE · 28 JUL 2026
Invaluement
About
Commercial list aimed at filling gaps left by free lists. Not free for any use; subscription required.
Listing criteria
Commercial IP reputation database focused on hard-to-detect spam (compromised hosts, hijacked IPs) that the larger free lists do not always catch.
How to query
For an IP address 1.2.3.4, query reversed-octets-dot-zone:
dig +short 4.3.2.1.sip.invaluement.comA returned IP (such as 127.0.0.2) means listed. Each blocklist has its own set of return codes meaning different things; the operator's documentation explains theirs.