25 free network tools

The fastest
DNS & network
toolkit online.

DNS lookup, IP geolocation, port checker, WHOIS, SSL certificates, MX records, SPF/DMARC, subnet calculator — all free, no account needed.

Querying DNS…
25 Free tools
<100ms DNS query time
100% No signup
Toolkit
All Network Tools

Every tool is free, instant, and requires no account. Results powered by Google Public DNS and global IP data.

DNS Tools
9 tools
🔍
DNS Lookup
Query any DNS record type — A, AAAA, MX, TXT, CNAME, NS, SOA, SRV, CAA
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MX Record Lookup
Find mail exchange records and priority values for any domain
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NS Lookup
Discover authoritative name servers for any domain
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Reverse DNS
PTR record lookup — find the hostname associated with an IP address
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DNS Record Builder New
Get exact copy-ready DNS records for Google Workspace, Microsoft 365, SendGrid, Cloudflare, and 25+ services
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Bulk DNS Lookup New
Query DNS records for up to 50 domains at once — compare in a table, export CSV
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DNS Propagation Checker
Check DNS propagation across 20+ global resolvers worldwide
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DNS TTL Migration Planner New
Get a step-by-step countdown for zero-downtime DNS migration based on your current TTL
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DNS Benchmark New
Compare Cloudflare, Google, Quad9, OpenDNS response times — find the fastest from your location
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IP & Network Tools
5 tools
📍
IP Address Lookup
Geolocate any IPv4 or IPv6 address — country, city, ISP, timezone
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Port Checker
Test if TCP ports are open on any host — single port or scan 17 common ports
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🧮
Subnet Calculator
CIDR calculator — network address, broadcast, host range, subnet mask
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ASN / BGP Lookup
Look up autonomous system numbers, BGP routing info, and IP prefix data
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Is It Down?
Check if a website is down for everyone or just you in real time
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Domain & Security
5 tools
📋
WHOIS Lookup
Domain registration details, registrar, creation date, expiry, nameservers
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SSL Certificate Checker
Verify SSL/TLS certificates, check expiry dates, issuer, and SANs
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🔗
SSL Chain Visualizer New
Visualize root → intermediate → leaf cert chain. Find missing intermediates and chain errors
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HTTP Headers
Inspect response headers, security grade, status codes, and redirects
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Tech Stack Detector New
Detect CMS, CDN, server, frameworks, analytics, and email providers from any site's headers
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Email Tools
4 tools
📧
Email Deliverability Tester
Full scan — SPF, DMARC, DKIM, MX, MTA-STS, BIMI with A–F grade
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✉️
SPF / DMARC / DKIM Checker
Check individual SPF records, DMARC policy, and DKIM signatures
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Email Header Analyzer New
Paste raw email headers — get hop-by-hop routing trace, auth results, delay analysis, spam diagnosis
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IP Blacklist Checker New
Check any IP against Spamhaus, Barracuda, SpamCop, SORBS, and 30+ DNSBLs with delist links
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Advanced DNS
2 tools
📁
Zone File Generator New
Build a complete BIND zone file with a form UI, quick templates, and one-click download
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📶
Ping / Response Time
Test HTTP response time and connectivity to any server or domain
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Why NetDig
Built for speed and accuracy

DNS lookups run directly against Google Public DNS for maximum accuracy. No caching of stale results, no middlemen.

⚡
Sub-100ms DNS Queries
Direct queries to Google Public DNS, not through a proxy server that caches old data.
🔓
No Account Required
Every tool is 100% free with no registration, no API keys, no limits.
🛡️
No Tracking
We don't log your queries. Your lookups are private.
📱
Mobile Ready
All tools work perfectly on phones and tablets.