DNS & network tools
Paste a domain, IP or URL into any tile and press Enter. Your IP: 216.73.217.55
DNS
Domain & IP
Network
Web & Mail
Free DNS & network tools
Diagnose DNS, mail and network problems in seconds.
20 free tools from the engineers at Green Olive Tree. Look up records, check propagation, test email authentication, scan blocklists and more.
Your IP address: 216.73.217.55
DNS
Look up records, test delegation and watch changes propagate.
DNS Record Lookup
Look up A, AAAA, MX, NS, TXT, SOA, CAA and other records for any domain.
DNS Health Report
A full check of delegation, name servers, SOA, mail records, SPF, DMARC and DNSSEC.
DNS Propagation Checker
See what 18 public resolvers around the world return for a record right now.
Reverse DNS Lookup
Find the PTR record for an IP and confirm it resolves back (forward-confirmed rDNS).
DNSSEC Test
Check DS and DNSKEY records, signature expiry, and whether validating resolvers trust the zone.
Domain & IP
Find out who owns a domain or IP, where it is, and what network it is on.
Domain / IP WHOIS
Registration details for a domain, or ownership of an IP network, straight from the registry.
IP Location Finder
Approximate geographic location, network and organisation for an IP address.
ASN Lookup
Find the autonomous system and routed prefix that announces an IP, or details of an AS number.
Reverse IP Lookup
List other domain names hosted on the same IP address.
Abuse Contact Lookup
Find where to report spam, phishing or attacks from a domain or IP address.
MAC Address Lookup
Identify the hardware manufacturer from a MAC address prefix (OUI).
What's My IP
Your public IP address, reverse DNS, network and browser details.
Network
Test reachability and open ports from our network.
Web & Mail
Check websites, certificates and email deliverability.
HTTP Headers
View response headers and redirects for a URL, with a security-header check.
Is My Site Down?
Check whether a website is up from our network, with status code and response time.
SSL Certificate Checker
Inspect a TLS certificate: issuer, expiry, hostnames covered, chain trust and protocol.
Spam Blacklist Check
Check an IP or domain against the major DNS-based spam blocklists (DNSBLs).
Email Authentication
Validate MX, SPF (with lookup count), DKIM, DMARC, MTA-STS and BIMI records.
Use the tools from scripts
Every tool also returns JSON. Add format=json to any results URL, for example:
https://dnstools.greenolivetree.net/dns-record-lookup/?domain=example.com&type=MX&format=jsonFair-use limits apply: about 60 checks every 10 minutes per IP address, and heavier tools such as traceroute and port scans count for more. Only scan hosts you own or are authorised to test.