Organisation and ASN
Who uses the address and the autonomous system number.
IP WHOIS
See the owner, network block and WHOIS record of an IPv4 address. Dotted IP only; domains are not queried here.
Your connection
Enter an IPv4 address (e.g. 8.8.8.8). The result appears here as a card.
An IPv4 address belongs to a network block. Who that block is assigned to is recorded by RIRs such as RIPE, ARIN and APNIC. This page accepts dotted IPv4 only (e.g. 8.8.8.8). Use Domain WHOIS for a domain name and IP Blacklist for spam lists.
Public / connection IP is the address this site sees. Local IP is the private address in your browser; private IPs have no public WHOIS record.
Who uses the address and the autonomous system number.
The allocated range the IP sits in, plus the net name.
Reverse DNS. Outbound mail servers are expected to have a PTR that matches the A record.
To see whether a sending IP is listed, use IP Blacklist. PTR together with SPF/DMARC is covered on DNS Analysis. Keep the IP under your control with İsim Kayıt cloud or corporate mail.