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 SSL/TLS certificate validity, issuer, expiry date, and remaining days for any domain to prevent HTTPS outages and certificate trust errors.

Check domain age instantly to see first registration date, active years, and WHOIS-derived history signals for SEO, trust checks, and due diligence.

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 whether an IP or domain is listed on major DNSBL email blocklists to diagnose deliverability failures and prioritize delisting actions.

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. Inspect nameserver, hostmaster email, serial version, and zone timing values.

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

Look up WHOIS data for any IP to identify network owner, ISP, country, registry allocation, and routed IP range details in one fast report.

Check if a domain is available for registration by querying live registry data. Search common extensions and validate candidates before purchase.

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 whether a domain has DNSSEC enabled by validating DNSKEY and DS records. Confirm DNS integrity signals and reduce spoofing risk.

Decode SSL/TLS PEM certificates to inspect subject, issuer, SANs, validity dates, key metadata, and fingerprints for faster troubleshooting.

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

Look up every DNS record for a domain in one query — A, AAAA, CNAME, MX, NS, TXT, SOA, and CAA records together. Free, instant results from public resolvers.

Find the autonomous system number, network name, route prefix, registry, and country behind any IP address or AS number with this free ASN lookup.

Analyze raw email headers to trace delivery hops, authentication checks, and alignment issues with spam clues, entirely in your browser for private troubleshooting.

Convert any address to latitude and longitude, or turn coordinates back into a full address. Free forward and reverse geocoding powered by OpenStreetMap.

Look up the geographic location of any IP address or domain. See the country, region, city, ZIP, coordinates, timezone, ISP, and organization instantly.

Expand a CIDR block or IPv4 range into a list of every address. Shows network, broadcast, first and last host and the total count — calculated in your browser.

Expand an IPv6 address to its full 8-group form or compress it to the shortest valid notation. Handles :: zero compression and leading zeros — all in your browser.

Look up the manufacturer behind any MAC address. Enter a MAC or OUI to see the vendor company, address, country, and registered block. Free, instant.

Discover other domains and websites hosted on the same IP address. Free reverse IP lookup for shared-hosting research, recon, and infrastructure mapping.

Discover the subdomains of any domain from public Certificate Transparency logs. A free, passive subdomain finder for recon, audits, and attack-surface mapping.

Get a free disposable email address that receives mail instantly in your browser. Protect your real inbox from spam — messages auto-delete after 24 hours.

Check which TLS protocol versions a server supports, from legacy TLS 1.0 and 1.1 to modern TLS 1.2 and 1.3. A free TLS version checker that runs a real handshake.

Look up any UK postcode to find its region, country, administrative district, parish, and exact latitude and longitude. Free, fast postcode lookup.

Monitor any website live from your browser. Automatic re-checks every 30 seconds chart response time, track uptime percentage and log every incident.