Network & Monitoring Tools

Check whether a website is online, slow, or offline: HTTP status, response time, and the cause of errors such as DNS issues, timeouts, TLS errors, or 5xx responses.

Check whether a DNS record has propagated worldwide by querying 20 public resolvers simultaneously.

Check a website for known vulnerabilities and outdated software: detect PHP, web server, OpenSSL and CMS versions, compare them with current releases and security advisories, and identify missing security headers. Also includes a self-check for the operating system, databases and pending updates on your own server.

Look up a domain’s A, AAAA, MX, TXT, NS, CNAME, SOA and CAA records, plus Reverse DNS for any IP.

Check whether your desired domain is available across all offered extensions, with prices and available alternatives.

Check a domain's registrar, registration date, expiration date, and nameservers.

Check a domain's SPF, DKIM, DMARC and MX at a glance, with clear guidance.

Generate SPF, DKIM and DMARC records for sending email from your domain: choose an email provider, configure your own servers and policy, generate a DKIM key in your browser and add everything directly to your ZAP-Hosting domain.

Check whether an IP address or mail server is on spam blacklists (RBL/DNSBL) such as Spamhaus, Barracuda, and SpamCop, including reverse DNS and removal guidance.

Calculate the network address, broadcast address, subnet mask, and usable host range from a CIDR address, and convert between CIDR and IP ranges (IPv4 and IPv6).

Practice subnetting with random exercises at three levels: determine the network address, broadcast address, host range and number of hosts, check your answers and view the solution step by step.

Interactively learn the 7 layers of the OSI model: click layers, assign terms such as switch, ARP, or port 443, and explore animated encapsulation, a quiz, and a cheat sheet for the IHK exam.

Interactively learn the 4 layers of the TCP/IP model (DoD model) according to RFC 1122, with OSI model mapping, animated encapsulation, a port quiz, and a cheat sheet.

Display the public IP address, IPv4/IPv6 version, reverse DNS record, and approximate country.

Find the country, region, city, ISP/ASN, and reverse DNS for any IP address or domain. Results are checked against a locally stored geodatabase without sharing data with third parties.

Check an SSL/TLS certificate’s status, issuer, validity period, and expiration date at a glance.

Check a URL’s redirect chain hop by hop: status codes (301/302/307/308), HTTP headers, server IP, and response time for each redirect.

Check whether specific ports are open on an IP or hostname—select a protocol or game instead of scanning all ports at once.

Enter a port or service to learn what it does and copy ready-to-use firewall commands for ufw, iptables, nftables, firewalld and Windows. Includes the complete IANA port list and a port check.

Identify the manufacturer/vendor of a MAC address using its OUI against a locally bundled IEEE registry snapshot, without sharing data with third parties.

Measure download, upload, and ping speeds to a ZAP-Hosting location.

Trace the route from our locations to you (and back), with packet loss at each hop and a plain-language analysis.

Measure ping, jitter, and packet loss to all Game Server locations and get a recommendation for the best one.