Network Tools, made
simple.
Check your IP, inspect DNS, test ports, verify SSL and diagnose public network services
with fast, focused online networking tools.
IP Checker
Find the public IP address visible to Spexo.
DNS Checker
Inspect A, AAAA, CNAME, NS and TXT records for a hostname.
ISP Checker
Identify ISP, ASN, organization and approximate network location for a public IP.
Reverse DNS Lookup
Find hostnames associated with an IPv4 or IPv6 address.
MX Lookup
Check mail exchanger records and their priorities for a domain.
WHOIS Lookup
Query registration information published by the domain registry.
Port Checker
Check whether a TCP port on a public host accepts connections.
HTTP Headers Checker
Inspect response headers returned by a public HTTP or HTTPS URL.
HTTP Status Checker
Check the HTTP response status and basic response headers.
SSL Checker
Inspect the TLS certificate, validity dates and negotiated protocol.
Subnet Calculator
Calculate network, broadcast, host range and usable host count from IPv4 CIDR.
Ping Test
Test reachability and round-trip latency to a public host or IP.
Traceroute
Trace network hops from Spexo to a public host or IP.
Blacklist Checker
Check a public IPv4 address against supported DNSBL/RBL sources.
Redirect Checker
Inspect HTTP redirect steps, status codes and final destination.
Domain Expiry Checker
Check RDAP registration dates, expiry and domain status.
MAC Address Lookup
Validate a MAC address and look up its OUI vendor.
Free Online Networking Tools
Diagnose common network issues with a focused toolkit for public IP addresses, DNS records, ISP and ASN details, TCP ports, SSL certificates, HTTP responses and IPv4 subnets. Run quick checks without an account, then use our practical guides to understand the results and decide what to investigate next.