With IPv64's online ping tool you can quickly check the ICMP reachability of a destination.
The Internet Control Message Protocol (ICMP) is used in computer networks to exchange information and error messages via the Internet Protocol in version 4 (IPv4). A similar protocol called ICMPv6 exists for IPv6.
ICMP is part of IPv4, but is treated as an independent protocol. Every router and computer is expected to "understand" ICMP. Most ICMP packets contain diagnostic information: They are sent back to the source by the router when the router drops packets, for example because the destination is unreachable or the TTL has expired. The following principles apply:
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