Assertion: ping | /r/HasProperty | dns lookup
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Source sentences:
text: Displays network information and diagnostics: Ping a server (via ICMP over IPv4 or IPv6 and TCP), DNS lookup (with geographical lookup of IP addresses), reverse DNS lookup, WHOIS queries, inspecting HTTP response headers, trace routes (also with IP address geo lookup), check whether a range of ports is open, scan a host for SSL versions and ciphers, and look up the location of hosts and whether it's reachable from the public internet.