![]() In general, a publicly-accessible server should always respond, whereas the firewalls on many other types of machines block pings by default. Some firewalls block echo requests to prevent distributed denial of service (DDoS) attacks, to reduce the visibility of the host, or even by mistake. However, this may not always be the case. Per RFC 1122, “Requirements for Internet Hosts,” each host must send an echo reply when pinged. The tool sends an echo request packet to the host and listens for an echo reply packet. As such, any functioning host on the internet should respond to the pings sent by the tool. The Online Ping tool uses the Internet Control Message Protocol (ICMP), which is an integral part of the Internet Protocol (IP). As such, you cannot rely on the responses to provide you with consistent, trustworthy information. You can perform a broadcast (multiple-IP address) ping (eg, 104.24.255.255), but the hosts covered are not required to respond. ![]() One common error code is 1214 (transmit failed) when pinging an unreachable or non-existent host. A valid response, including a set of times, for a different server.An error message (eg, Couldn't resolve host name).If you provide a non-existent domain name, the results can be unpredictable. If this is the case, you'll notice that it will take slightly longer for the command to complete. If the destination is reachable, but the server doesn't respond, you will receive a Timed Out response. When done, the tool will present you with the round-trip time (in milliseconds) for each ping, as well as the overall average time. Online Ping sends a packet to the destination and waits for a response. To help diagnose intermittent issues, we recommend running the tool several times (with tests separated by at least a few minutes). If you're having issues with a domain name or IP address, the Online Ping tool can determine if the site is live and if it is having problems.
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