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Net Tools

Network checks with clear answers, built in. Open Net Tools from the left bar.

Net Tools with the subnet calculator
Net Tools with the subnet calculator · full screenshot

Note: checks run from the FusionTerm server — not from your computer and not from a connected SSH session. That's useful: it shows what your server room or cloud network can reach. The top of the page shows which machine that is.

Note: checks that connect to the target (ping, ports, traceroute, MTR, HTTP, TLS and web) follow the same destination policy as HTTP diagnostics: cloud metadata and link-local addresses are never reached, the FusionTerm server itself is off, and internal networks are for administrators unless an administrator opens them for everyone or adds trusted networks. A refused check says why and is recorded in the audit log. DNS, WHOIS, propagation and email checks only ask DNS and WHOIS servers, so they aren't limited.

Type a domain, IP address or URL and click Check everything, or pick a single check:

Check What it tells you
DNS records A, AAAA, CNAME, MX, TXT, NS records for a name
DNS propagation Asks the server's DNS and four public resolvers the same question — useful right after you change a record
WHOIS Who a domain or IP is registered to
Ping Whether a host answers, and how fast
Ports Which TCP ports are open
Traceroute / MTR The path packets take, and where they get lost or slow
TLS certificate Protocol, cipher, certificate chain, names covered, key strength and expiry — for any TLS service, not only websites
Website security Follows redirects, measures response time and grades the security headers A–F, with what to fix
Email security The DNS records that stop others sending email as your domain: MX, SPF, DMARC and MTA-STS
HTTP basics Status, redirects and headers of a web page — for deeper website and API troubleshooting use HTTP diagnostics
Subnet calculator Network, mask, first/last address and size of a range like 10.20.0.0/22 — works offline

Results use plain words and colours: green is fine, amber deserves a look, red needs fixing.

Note: MTR isn't available when the FusionTerm server runs Windows.