Network
Blacklist Checker
Check whether an IP or domain appears on DNSBL/RBL blacklists to investigate deliverability, reputation or mail blocking issues.
cURL to Code Converter
Paste cURL commands copied from your browser and instantly convert them into usable code in languages like Python, JavaScript, Go, PHP and more.
DNS Lookup
Query DNS records for a domain to review resolution, mail, TXT verification, nameservers and other useful data during deployments or diagnostics.
Email header analyzer
Paste an email's headers and rebuild its route: every server it went through, how long each hop took, the SPF, DKIM and DMARC results and phishing signs such as a Reply-To from another domain. Everything is analysed in your browser.
HTTP header checker
Query response headers, status, redirects, cookies and security policies to debug websites, APIs, cache and CORS configuration.
IP geolocation
Get estimated location, ISP, ASN and coordinates for an IP address for traffic analysis, technical support or access investigation.
IPv4 to IPv6
Convert IPv4 addresses to IPv6 representations, review mapped or compatible formats and validate compressed or expanded notation.
Manufacturer lookup by MAC OUI
Enter a MAC address or OUI prefix to identify the device manufacturer and speed up inventory, diagnostics or network reviews.
My Public IP
Check your current public IP along with useful connection data for support, VPN tests, firewall configuration or Internet egress verification.
Open Port Checker
Test from the Internet whether a TCP port on your public IP or any server accepts connections, to validate your router's port forwarding, find out if you are behind CGNAT or confirm that a sensitive service is not exposed.
Ping
Run connectivity tests against a host or IP to measure latency, packet loss and basic availability from a location outside your network.
SPF, DKIM and DMARC checker
Check how a domain protects its email: SPF with all its includes and the DNS lookup count, DKIM keys and their size, the DMARC policy, the MX servers and the MTA-STS, TLS-RPT and BIMI records, with every problem explained so you can fix it.
SSL Certificate Analyzer
Inspect SSL/TLS certificates for remote services to detect expirations, uncovered names, unexpected issuers or chain problems.
Subnet Calculator
Calculate ranges, masks, available hosts and special addresses to plan IPv4 or IPv6 subnets without doing manual calculations.
Trace Route
Trace hops to a destination to detect delays, outages or unexpected routes between networks, servers and connectivity providers.
Whois Lookup
Search public registration data for domains or IP addresses to review ownership, registrar, relevant dates, nameservers and available technical contact information.
X.509 Certificate, CSR and PEM Decoder
Paste a certificate, CSR, key or .pfx to see the subject, SANs, validity, extensions and fingerprints, sort and verify the chain, check which private key matches each certificate, convert formats and generate a new CSR, all in your browser.
About this category
The network tools help you diagnose connectivity and configuration problems without installing anything. Ping and traceroute measure latency and show the path to a host from outside your network, which is useful to tell whether a problem is local or on the provider's side. DNS lookup, whois and IP geolocation tell you who manages a domain or an address and where it points.
For email, there is an SPF, DKIM and DMARC checker, an email header analyzer and a blacklist lookup. You can also check HTTP headers and TLS certificates, test whether a port is open from the Internet, calculate IPv4 and IPv6 subnets, convert addresses between both formats, identify the manufacturer of a MAC address or translate a cURL command into code. Queries that need to reach the Internet are made from our server and do not accept private or local addresses.