All Tools

27 free network diagnostic tools. No sign-up, no limits.

🌐

Network

9 tools

Measure round-trip latency and packet loss to any host.

Check if a TCP port is open or closed on any host.

Reverse DNS Lookup

Find the hostname associated with an IP address.

Find location, ISP and ASN for any IP address.

Site Status Checker

Check if a website or service is up or down right now.

Global Website Check

Check DNS, SSL, status and response time from 5 global locations.

Look up Autonomous System info — org, country, IP prefixes.

Reverse IP Lookup

Find all domains hosted on an IP address.

Redirect Chain Tracer

Trace the full hop-by-hop redirect path for any URL.

🔍

DNS

3 tools

DNS Propagation

Check if DNS changes have propagated globally across resolvers.

Query A, AAAA, CNAME and other DNS record types.

MX Record Lookup

Look up mail exchange records for any domain.

📧

Email

4 tools

Validate the SPF TXT record for a domain.

Verify DKIM public key records for email signing.

Inspect DMARC policy — protect against email spoofing.

Email Deliverability Score

One combined 0-100 score for SPF, DKIM, DMARC and blacklist status.

🔒

Security

5 tools

SSL Certificate

Inspect SSL cert validity, expiry, issuer and cipher.

Domain registration info — registrar, expiry, nameservers.

Inspect HTTP response headers and security score.

Domain Expiry Checker

Check when a domain is set to expire, plus registrar and nameservers.

Blacklist Checker

Check if a domain or IP is listed on major email DNSBL blacklists.

📶

My Connection

1 tools

Connection Test

Speed, public IP, latency and DNS leak test for your own connection.

🛠️

Utilities

5 tools

CIDR Calculator

Calculate network address, broadcast, subnet mask and host range.

URL Encoder / Decoder

Encode or decode URL components and percent-encoded characters.

Encode text to Base64 or decode Base64 strings back to plain text.

Format, prettify, validate and minify JSON instantly.

Test regular expressions in real time with highlighted matches.