Network

Check whether an IP or domain appears on DNSBL/RBL blacklists to investigate deliverability, reputation or mail blocking issues.

Paste cURL commands copied from your browser and instantly convert them into usable code in languages like Python, JavaScript, Go, PHP and more.

Query DNS records for a domain to review resolution, mail, TXT verification, nameservers and other useful data during deployments or diagnostics.

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.

Query response headers, status, redirects, cookies and security policies to debug websites, APIs, cache and CORS configuration.

Get estimated location, ISP, ASN and coordinates for an IP address for traffic analysis, technical support or access investigation.

Convert IPv4 addresses to IPv6 representations, review mapped or compatible formats and validate compressed or expanded notation.

Enter a MAC address or OUI prefix to identify the device manufacturer and speed up inventory, diagnostics or network reviews.

Check your current public IP along with useful connection data for support, VPN tests, firewall configuration or Internet egress verification.

Run connectivity tests against a host or IP to measure latency, packet loss and basic availability from a location outside your network.

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.

Inspect SSL/TLS certificates for remote services to detect expirations, uncovered names, unexpected issuers or chain problems.

Calculate ranges, masks, available hosts and special addresses to plan IPv4 or IPv6 subnets without doing manual calculations.

Trace hops to a destination to detect delays, outages or unexpected routes between networks, servers and connectivity providers.

Search public registration data for domains or IP addresses to review ownership, registrar, relevant dates, nameservers and available technical contact information.