Instantly check an IP or domain against major email blacklists including Spamhaus, SURBL, SORBS, and more.
SPF is a method to prevent email sender address forgery. Enter your domain to analyze its SPF record.
Enter your domain to analyze your DMARC record or create a DMARC policy for your domain.
CIDR to IP Range
Enter a CIDR notation to instantly convert it to an IP range.
IP Range to CIDR
Enter a IP range to instantly convert it to an CIDR notation.
Perform a DNS lookup against multiple widely used nameservers around the world.