Portchecker.dev Documentation
Comprehensive documentations for all network, DNS, email, and IP tools available on PortChecker.dev
DNS Tools
DNS Propagation
Track DNS changes as they propagate through global DNS servers in real-time.
View Documentation →DNS Lookup
Query and view DNS records for any domain including A, AAAA, CNAME records and more.
View Documentation →Reverse DNS Lookup
Find domain names associated with an IP address using PTR records.
View Documentation →MX Lookup
Check mail exchange records for any domain to identify email servers.
View Documentation →TXT Record Lookup
View TXT records which contain domain verification data and other text information.
View Documentation →CAA Record Checker
Verify which Certificate Authorities are allowed to issue certificates for your domain.
View Documentation →NS Lookup
Identify the nameservers responsible for serving a domain’s DNS information.
View Documentation →PTR Record Lookup
Look up Pointer records used for reverse DNS resolution of IP addresses to domain names.
View Documentation →IP Address & Network Tools
Show My IP
Instantly displays your current public IPv4 and IPv6 addresses with additional information.
View Documentation →IPv4 / IPv6 Checker
Check if you have IPv6 connectivity and compare it with your IPv4 connection.
View Documentation →IP Geolocation
Find the geographic location of any IP address including country, city, and coordinates.
View Documentation →IP Range Calculator
Calculate start and end IP addresses for a given network range or CIDR notation.
View Documentation →Reverse IP Lookup
Discover all domains hosted on a single IP address or server.
View Documentation →Blacklist Check
Verify if an IP address is listed on common DNS blacklists or spam databases.
View Documentation →IP WHOIS Lookup
Retrieve registration details for IP addresses including owner, assigned range, and contacts.
View Documentation →MAC Address Lookup
Identify the hardware manufacturer associated with a MAC address.
View Documentation →Subnet & CIDR Tools
Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses, and available IP ranges.
View Documentation →IP Subnetting Tool
Create IP subnets with comprehensive network information and range details.
View Documentation →CIDR Calculator
Convert between CIDR notation and subnet masks with detailed network information.
View Documentation →IPv6 Subnet Calculator
Calculate IPv6 subnets, prefixes, and address ranges for IPv6 network planning.
View Documentation →VLSM Calculator
Create variable length subnet masks to efficiently allocate IP address space.
View Documentation →Wildcard Mask Calculator
Convert between subnet masks and wildcard masks used in access control lists.
View Documentation →IP Supernet Calculator
Combine multiple subnets into a single larger network address block.
View Documentation →Subnetting Practice Tool
Practice subnet calculations with randomly generated exercises and solutions.
View Documentation →Broadcast Address Finder
Calculate the broadcast address for any given network IP and subnet mask.
View Documentation →First/Last Host Finder
Identify the first and last usable host addresses in a subnet range.
View Documentation →Subnet Chart Generator
Create visual subnet charts showing address distribution and allocation.
View Documentation →Network ID Calculator
Calculate the network ID (network address) from any IP address and subnet mask.
View Documentation →Connection Testing Tools
Internet Speed Test
Measure your download and upload speeds, latency, and jitter without plugins.
View Documentation →Ping Tool
Test the responsiveness and connectivity to a host by sending ICMP echo requests.
View Documentation →Traceroute Tool
View the path that network packets take to reach a destination server.
View Documentation →Ping Test
Measure round-trip time, packet loss, and connectivity to servers worldwide.
View Documentation →Traceroute (Visual)
See network path visualization with interactive maps showing hop locations.
View Documentation →Packet Loss Checker
Identify and measure packet loss affecting your network connection quality.
View Documentation →Jitter Test
Measure the variation in network latency that affects real-time applications.
View Documentation →Network Security Tools
Port Scanner
Check which ports are open or closed on a remote server or network device.
View Documentation →NAT Type Tester
Determine your NAT type which affects gaming and peer-to-peer connectivity.
View Documentation →WebRTC Leak Test
Check if your VPN is leaking your real IP address through WebRTC connections.
View Documentation →DNS Leak Test
Verify if your DNS requests are being properly routed through your VPN or proxy.
View Documentation →Bandwidth Monitor
Monitor real-time network usage and identify bandwidth-consuming applications.
View Documentation →Firewall Tester
Test if your firewall is correctly blocking unwanted traffic and connections.
View Documentation →Email & Mail Server Tools
SPF Record Checker
Validate Sender Policy Framework records that help prevent email spoofing.
View Documentation →DMARC Record Lookup
Check Domain-based Message Authentication policies for enhanced email security.
View Documentation →DKIM Record Checker
Verify DomainKeys Identified Mail records used for email authentication.
View Documentation →Email Header Analyzer
Analyze email headers to track message path and identify potential issues.
View Documentation →Email Blacklist Checker
Check if your domain or mail server IP is listed on email blacklists.
View Documentation →Email Deliverability Test
Test if your emails will reach recipients’ inboxes or trigger spam filters.
View Documentation →SMTP Tester
Verify your outgoing mail server configuration and diagnose delivery issues.
View Documentation →Email Validation Tool
Check if an email address exists and is properly formatted without sending mail.
View Documentation →SSL for Mail Server
Test SSL/TLS configuration for SMTP, IMAP, and POP3 mail servers.
View Documentation →MTA-STS Validator
Validate SMTP MTA Strict Transport Security policy implementation for secure mail delivery.
View Documentation →TLS Checker (Email)
Check if your mail server supports TLS encryption for secure email transmission.
View Documentation →Open Relay Test
Check if your mail server is configured as an open relay that spammers could exploit.
View Documentation →SPF Generator Tool
Create SPF records for your domain with a user-friendly interface.
View Documentation →WHOIS & Domain Tools
WHOIS Lookup
Retrieve domain registration details including owner, registrar and expiration date.
View Documentation →