All Network Tools | NetTools.tech

My Info & Identity

See what your connection and browser reveal: IP address, user agent and more.

Available

My IP

Show your public IP address and approximate location.

Available

User Agent

Display your browser user agent and client details.

Backend required

People Search

Search lawfully published, publicly available information.

Also in My Info & Identity:

DNS & Domains

Look up DNS records, reverse DNS, WHOIS data and SSL certificates.

Available

Nslookup

Query DNS records for a domain.

Available

DNS Propagation Checker

Compare DNS answers from public resolvers worldwide.

Available

DNS Open Resolver Checker

Find out whether an IP answers DNS queries for anyone on the internet.

Available

Reverse DNS

Find the hostname mapped to an IP address.

Available

Whois

Get domain registration details.

Available

SSL Checker

Check SSL/TLS certificate validity and details.

Also in DNS & Domains:

Email Tools

Diagnose mail delivery, check SPF, DKIM and DMARC, and build authentication records.

Email Diagnostics

Available

MX Lookup

Find the mail servers that receive email for a domain.

Available

SMTP Test

Test a mail server’s SMTP banner, EHLO and STARTTLS.

Available

Email Health Check

One report covering MX, SPF, DKIM, DMARC and transport security.

Backend required

Email Deliverability

Check the factors that decide whether your mail reaches the inbox.

Available

Email Header Analyzer

Trace a message’s route and authentication from its headers.

Backend required

Mail Flow Test

Send a test message to us and see how it arrived.

Authentication & Security

Available

MultiRBL Check

Check an IP or mail server against multiple DNS blocklists at once.

Available

SPF Lookup

Check and validate a domain’s SPF record.

Available

DKIM Lookup

Fetch and check a DKIM public key by selector.

Available

DMARC Lookup

Check a domain’s DMARC policy and reporting setup.

Available

SPF Record Generator

Build a valid SPF record with built-in checks.

Available

DMARC Record Generator

Create a DMARC record with guided, validated options.

Available

DKIM Record Generator

Generate a DKIM key pair and the DNS record to publish.

Available

Email Blacklist Check

Check whether an IP or domain is listed on DNS blocklists.

Transport & Compliance

Available

MTA-STS Lookup

Check a domain’s MTA-STS record and policy file.

Available

TLS Reporting (TLS-RPT)

Check where a domain receives SMTP TLS failure reports.

Available

Email DNS Propagation

See whether email DNS changes are visible worldwide.

Available

Email Provider Compliance Check

Check sender requirements of major mailbox providers.

Utilities

Coming soon

Email Address Extraction

Extract unique email addresses from pasted text.

Available

Bulk DNS / Email Lookup

Run MX, SPF and DMARC lookups for many domains at once.

Also in Email Tools:

Network Diagnostics

Test connectivity, trace routes, check ports and probe network services.

Available

Ping

Test network connectivity and latency.

Available

Traceroute

Trace the network path to a destination.

Available

MTR

Traceroute and ping combined: loss and latency per hop.

Available

Network Jitter Test

Measure latency variation, failed probes and stability.

Available

Port Check

Check if a TCP port is open.

Available

Port Scanner & Firewall Test

Nmap scan of your own IP, a verified server or the demo host.

Backend required

SNMP

Query SNMP-enabled devices you manage.

Backend required

SIP

Check SIP/VoIP server availability.

Available

ASN Lookup

Find out which company owns an Autonomous System Number.

Security & Testing

Security checks for systems you own or are authorized to test.

Available

Web Pentest & Security Assessment

Safe exposure assessment: technologies, headers, TLS, exposed files.

Available

Password Generator

Generate strong random passwords with the characters you choose.

Available

Password Checker

See how strong or weak a password really is.

Also in Security & Testing:

IP & Network Utilities

Calculate subnets and work with IP and hardware address information.

Available

IP Lookup

Who owns and routes an IP address — registry, ASN, range, abuse contact.

Available

IP Geolocation

Approximate location of an IP address from a geolocation database.

Available

Subnet Calculator

Calculate network ranges, masks and host counts.

Available

MAC Lookup

Look up the vendor of a MAC address.

Also in IP & Network Utilities:

Web & SEO Utilities

Check website availability, HTTP responses and redirects, SEO metadata, crawler policies and links, and work with URLs.

Website Status & HTTP

Available

HTTP Status

Check HTTP response codes and headers.

Available

Is It Down

Check if a website is down for everyone or just you.

Available

Redirect Checker

Follow a URL’s redirect chain hop by hop.

Backend required

Website Screenshot Tool

Capture a screenshot of a web page.

Available

Page Size Checker

Measure a page’s download size and resources.

SEO & Metadata

Available

Sitemap Checker

Validate an XML sitemap and preview its URLs.

Available

Meta Tag Analyzer

Check a page’s title, description, canonical and robots tags.

Available

Website Authority Checker

Check a domain’s Open PageRank authority score and rank.

Available

Open Graph Checker

Preview how a link looks when shared.

Available

Broken Link Checker

Find broken links on a web page or small site.

Crawlers & Site Policies

Available

Robots.txt Checker

Fetch, validate and test a site’s robots.txt.

Available

Robots.txt LLM Policy Checker

See how robots.txt treats AI and search crawlers.

Available

llms.txt Checker

Check a site’s llms.txt file and its structure.

Available

security.txt Checker

Validate a site’s security.txt contact file (RFC 9116).

URL & Content Utilities

Backend required

Video Download

Download videos you have the rights to use.

Available

URL Encoder / Decoder

Percent-encode or decode URLs and query strings.

Backend required

URL Shortener

Turn a long URL into a short link.

Conversion & Calculation Tools

Convert units, number bases, IP addresses and subnet masks; calculate bandwidth, transfer times and RAID capacity.

Unit Converters

Available

Unit Converter

Convert data, rates, frequency, time, electrical units, temperature and Unix timestamps.

Available

CPU Frequency Converter

Convert Hz, kHz, MHz, GHz and THz.

Available

Data Storage Converter

Convert bytes, bits and decimal vs binary units (GB, GiB…).

Data & Network Speed

Available

Bits & Bytes Explainer

Understand bits vs bytes, prefixes and transfer rates.

Available

Bandwidth Calculator

Calculate download/transfer time, data volume or required bandwidth.

Storage

Available

RAID Calculator

RAID 0/1/5/6/10/50/60 capacity, efficiency and fault tolerance.

Numbers & Addresses

Available

Number Base Converter

Convert between binary, octal, decimal, hex and any base 2–36.

Available

IP Address Converter

Convert IPv4/IPv6 to binary, hex, integer and more.

Available

Subnet Mask Converter

Convert masks ⇄ CIDR and split networks into subnets/VLANs.