Network & DNS

Look up DNS records for any domain — A, AAAA, MX, NS, TXT, CNAME, SOA, and CAA records. Free, instant results pulled from authoritative nameservers.

Check if your DNS changes have propagated worldwide. Test A, MX, and NS records across 8 global DNS servers to confirm updates are live everywhere.

Instantly find your public IP address. Shows your IPv4 address as seen by websites and servers, plus quick details about your connection.

View HTTP response headers for any URL. Check status codes, security headers, caching, redirects, and server details instantly. Free and private.

Check if a website is down for everyone or just you. Instantly test whether any URL is reachable and see its HTTP status code in real time.

Check if a TCP port is open or closed on any host. Test firewall rules and server accessibility instantly — great for debugging network services.

Look up MX (Mail Exchanger) records for any domain. Find which mail servers handle email delivery and check their priority order instantly.

Check the SPF (Sender Policy Framework) record for any domain. Validate your email authentication setup and spot misconfigurations instantly.

Check the DMARC policy for any domain. Validate p=reject, p=quarantine, or p=none and review your alignment and reporting settings instantly.

Trace the full redirect chain of any URL. See every 301, 302, 307 redirect hop, final destination, and HTTP status codes.

Calculate network address, broadcast address, usable IP range, and host count for any IPv4 subnet. Free CIDR calculator.

Convert IPv4 addresses to decimal, binary, and hexadecimal formats. Also convert decimal numbers back to IP addresses. Free online IP converter.

Convert international domain names (IDN) between Unicode and Punycode (ACE) format. Encode and decode xn-- labels instantly.

Generate SPF DNS TXT records for your domain. Support for Google Workspace, Microsoft 365, SendGrid, Mailchimp, custom IPs and includes.

Generate DMARC DNS TXT records for your domain. Set policy, alignment, and reporting email addresses. Free DMARC policy generator.

Look up the hostname linked to any IP address using reverse DNS (PTR record lookup). Free and instant — useful for email and server diagnostics.

Look up WHOIS registration data for any domain. Find the registrar, creation date, expiry, and nameservers instantly — free, fast, and accurate.

Check any website's SSL/TLS certificate validity, issuer, expiry date, and days remaining. Instant SSL verification.

Check how old any domain name is. Find out when it was first registered and how many years it has been active.

Look up the nameservers (NS records) for any domain. Find which DNS providers handle a domain and verify your nameserver setup instantly.

Look up TXT records for any domain. View SPF, DMARC, DKIM, and domain-verification TXT records instantly to debug email and ownership setup.

Find the IP address of any domain name. Look up both IPv4 and IPv6 addresses for any website or hostname instantly — free, fast, and accurate.

Find the geographic location of any IP address. Look up the city, country, ISP, timezone, and ASN for any IP — free, instant, and accurate.

Check if your IP or domain is blacklisted on major email blocklists (DNSBLs). Diagnose email deliverability issues.

Look up CAA (Certification Authority Authorization) records for any domain. See which certificate authorities are allowed to issue SSL certificates.

Look up the SOA (Start of Authority) DNS record for any domain. View primary nameserver, hostmaster, serial number, and TTL values.

Look up DKIM (DomainKeys Identified Mail) DNS records for any domain and selector. Verify your DKIM email authentication setup.

Look up WHOIS registration data for any IP address. Find network owner, ISP, country, and IP range information.

Check if a domain name is available for registration. Instantly search .com, .net, .org, and more to find your next domain name. Free and fast.

Find out what web hosting provider any website is using. Detect AWS, Cloudflare, Vercel, DigitalOcean, and more from nameservers.

Validate email addresses for correct format, active MX records, and disposable domain detection. Free bulk email verification.

Test a domain's email delivery capability. Check MX records, resolve mail server hostnames, and verify SMTP port 25 accessibility.

Ping any website or IP address online. Check network reachability and measure average round-trip latency to diagnose connection problems fast.

Trace the network path to any website or IP address. See every hop, router IP, and latency along the route to diagnose slow or failing routes.

Check if a domain has DNSSEC (DNS Security Extensions) enabled. Verify DNSKEY and DS records for DNS authentication.

Decode and inspect SSL/TLS certificates from PEM format. View subject, issuer, SANs, validity dates, and fingerprints.

Decode and inspect Certificate Signing Requests (CSR). View subject details, public key size, and algorithm from PEM CSR.