Online network tools & utilities
All Your Network Tools.
One Place.
Free online tools for network diagnostics, DNS lookups, IP analysis, website monitoring and more.
Browse by category
Every tool, grouped by the job you need to get done.
My Info & Identity
See what your connection and browser reveal: IP address, user agent and more.
- My IP (available now)
- User Agent (available now)
- People Search
- Internet Speed Test (available now)
- Network Jitter Test (available now)
- IP Lookup (available now)
- MAC Lookup (available now)
DNS & Domains
Look up DNS records, reverse DNS, WHOIS data and SSL certificates.
- Nslookup (available now)
- DNS Propagation Checker (available now)
- DNS Open Resolver Checker (available now)
- Reverse DNS (available now)
- Whois (available now)
- SSL Checker (available now)
- MX Lookup (available now)
Email Tools
Diagnose mail delivery, check SPF, DKIM and DMARC, and build authentication records.
- MX Lookup (available now)
- MultiRBL Check (available now)
- SMTP Test (available now)
- Email Health Check (available now)
- Email Deliverability
- Email Header Analyzer (available now)
- Mail Flow Test
Network Diagnostics
Test connectivity, trace routes, check ports and probe network services.
- Ping (available now)
- Traceroute (available now)
- MTR (available now)
- Internet Speed Test (available now)
- Network Jitter Test (available now)
- Port Check (available now)
- Port Scanner & Firewall Test (available now)
Security & Testing
Security checks for systems you own or are authorized to test.
- Web Pentest & Security Assessment (available now)
- Password Generator (available now)
- Password Checker (available now)
- DNS Open Resolver Checker (available now)
- SSL Checker (available now)
- Email Blacklist Check (available now)
- Port Check (available now)
IP & Network Utilities
Calculate subnets and work with IP and hardware address information.
- IP Lookup (available now)
- IP Geolocation (available now)
- Subnet Calculator (available now)
- MAC Lookup (available now)
- My IP (available now)
- ASN Lookup (available now)
- IP Address Converter (available now)
Web & SEO Utilities
Check website availability, HTTP responses and redirects, SEO metadata, crawler policies and links, and work with URLs.
- HTTP Status (available now)
- Is It Down (available now)
- Video Download
- URL Encoder / Decoder (available now)
- URL Shortener (available now)
- Redirect Checker (available now)
- Robots.txt Checker (available now)
Conversion & Calculation Tools
Convert units, number bases, IP addresses and subnet masks; calculate bandwidth, transfer times and RAID capacity.
- Unit Converter (available now)
- Number Base Converter (available now)
- CPU Frequency Converter (available now)
- Data Storage Converter (available now)
- Bits & Bytes Explainer (available now)
- Bandwidth Calculator (available now)
- RAID Calculator (available now)
- 72 tools64 available now, more in progress
- No registrationOpen a tool and start
- Privacy-firstBrowser tools run locally
- Built for professionalsAdmins, DevOps and developers
Popular tools
The most commonly used network tools. Status badges show what’s available today.
User Agent
Browser, user agent, device, screen and capability details.
Nslookup
Query DNS records for a domain.
DNS Propagation Checker
Compare DNS answers from many public resolvers.
Whois
Get domain registration details.
SSL Checker
Check SSL/TLS certificate validity and details.
MX Lookup
Find the mail servers that receive email for a domain.
Email Header Analyzer
Trace a message’s route and authentication from its headers.
SPF Lookup
Check and validate a domain’s SPF record.
DMARC Lookup
Check a domain’s DMARC policy and reporting setup.
Ping
Test network connectivity and latency.
Traceroute
Trace the network path to a destination.
MTR
Traceroute and ping combined: loss and latency per hop.
Internet Speed Test
Measure download, upload, ping, jitter and request loss.
Network Jitter Test
Measure latency variation, failed probes and stability.
Port Check
Check if a TCP port is open.
IP Lookup
Who owns and routes an IP address — registry, ASN, range, abuse contact.
Subnet Calculator
Calculate network ranges, masks and host counts.
HTTP Status
Check HTTP response codes and headers.
URL Encoder / Decoder
Percent-encode or decode URLs and query strings.
Unit Converter
Convert data, rates, frequency, time, electrical units, temperature and Unix timestamps.
My IP
Show your public IP address and approximate location.
User Agent
Browser, user agent, device, screen and capability details.
Nslookup
Query DNS records for a domain.
DNS Propagation Checker
Compare DNS answers from many public resolvers.
DNS Open Resolver Checker
Find out whether an IP answers DNS queries for anyone on the internet.
Reverse DNS
Find the hostname mapped to an IP address.
Whois
Get domain registration details.
SSL Checker
Check SSL/TLS certificate validity and details.
MX Lookup
Find the mail servers that receive email for a domain.
MultiRBL Check
Check an IP or mail server against multiple DNS blocklists at once.
SMTP Test
Test a mail server’s SMTP banner, EHLO and STARTTLS.
Email Health Check
One report covering MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT and SMTP.
Email Header Analyzer
Trace a message’s route and authentication from its headers.
SPF Lookup
Check and validate a domain’s SPF record.
DKIM Lookup
Fetch and check a DKIM public key by selector.
DMARC Lookup
Check a domain’s DMARC policy and reporting setup.
SPF Record Generator
Build a valid SPF record with built-in checks.
DMARC Record Generator
Create a DMARC record with guided, validated options.
DKIM Record Generator
Generate a DKIM key pair and the DNS record to publish.
Email Blacklist Check
Check whether an IP or domain is listed on DNS blocklists.
MTA-STS Lookup
Check a domain’s MTA-STS record and policy file.
TLS Reporting (TLS-RPT)
Check where a domain receives SMTP TLS failure reports.
Email DNS Propagation
See whether email DNS changes are visible on public resolvers.
Email Provider Compliance Check
Check sender requirements of major mailbox providers.
Bulk DNS / Email Lookup
Look up one DNS record type for many domains at once.
Ping
Test network connectivity and latency.
Traceroute
Trace the network path to a destination.
MTR
Traceroute and ping combined: loss and latency per hop.
Internet Speed Test
Measure download, upload, ping, jitter and request loss.
Network Jitter Test
Measure latency variation, failed probes and stability.
Port Check
Check if a TCP port is open.
Port Scanner & Firewall Test
Nmap scan of your own IP, a verified server or the demo host.
ASN Lookup
Find out which company owns an Autonomous System Number.
Web Pentest & Security Assessment
Safe exposure assessment: technologies, headers, TLS, exposed files.
Password Generator
Generate strong random passwords with the characters you choose.
Password Checker
See how strong or weak a password really is.
IP Lookup
Who owns and routes an IP address — registry, ASN, range, abuse contact.
IP Geolocation
Approximate location of an IP address from a geolocation database.
Subnet Calculator
Calculate network ranges, masks and host counts.
MAC Lookup
Look up the vendor of a MAC address.
HTTP Status
Check HTTP response codes and headers.
Is It Down
Check if a website is down for everyone or just you.
URL Encoder / Decoder
Percent-encode or decode URLs and query strings.
URL Shortener
Turn a long URL into a short link.
Redirect Checker
Follow a URL’s redirect chain hop by hop.
Robots.txt Checker
Fetch, validate and test a site’s robots.txt.
Sitemap Checker
Validate an XML sitemap and preview its URLs.
Meta Tag Analyzer
Check a page’s title, description, canonical and robots tags.
Website Authority Checker
Check a domain’s Open PageRank authority score and rank.
Open Graph Checker
Preview how a link looks when shared.
Broken Link Checker
Find broken links on a web page or small site.
Page Size Checker
Measure a page’s download size and resources.
Robots.txt LLM Policy Checker
See how robots.txt treats AI and search crawlers.
llms.txt Checker
Check a site’s llms.txt file and its structure.
security.txt Checker
Validate a site’s security.txt contact file (RFC 9116).
Unit Converter
Convert data, rates, frequency, time, electrical units, temperature and Unix timestamps.
Number Base Converter
Convert between binary, octal, decimal, hex and any base 2–36.
CPU Frequency Converter
Convert Hz, kHz, MHz, GHz and THz.
Data Storage Converter
Convert bytes, bits and decimal vs binary units (GB, GiB…).
Bits & Bytes Explainer
Understand bits vs bytes, prefixes and transfer rates.
Bandwidth Calculator
Calculate download/transfer time, data volume or required bandwidth.
RAID Calculator
RAID 0/1/1E/5/5E/5EE/6/10/50/60 capacity, efficiency and fault tolerance.
IP Address Converter
Convert IPv4/IPv6 to binary, hex, integer and more.
Subnet Mask Converter
Convert masks ⇄ CIDR and split networks into subnets/VLANs.
Built for responsible use
Network tools validate every input, block private and internal address ranges, and will be rate limited. Scanning and security tools only work on targets you can prove you own. No simulated results — if a tool isn’t ready, we say so.