PING
DCF7LF Radio DCF77, Mainflingen, DE, 77.5 kHz
MSFLF Radio MSF, Rugby, UK, 60 kHz
JJYLF Radio JJY, Fukushima, JP, 40 kHz,
JJYLF Radio JJY, Saga, JP, 60 kHz
WWVHF Radio WWV, Ft. Collins, CO
WWVHHF Radio WWVH, Kaui, HI
NISTNational Institute of Standards and Technology telephone modem
PTBPhysikalisch-Technische Bundesanstalt telephone modem
For strata 2-15 secondary servers, this is the reference identifier of the system peer. If the
system peer is using the IPv4 address family, the identifier is the four-octet IPv4 address. If
the system peer is using the IPv6 address family, it is the first four octets of the MD5 hash of
the IPv6 address.
Reference Timestamp
Time when the system clock was last set or corrected, in 64-bit NTP timestamp format. NTP
timestamps are represented as a 64-bit unsigned fixed-point number, in seconds relative to
0h on 1 January 1900. The integer part is in the first 32 bits and the fraction part in the last 32
bits. In the fraction part, the non-significant low order bits are not specified and ordinarily set
to 0.
Originate Timestamp
Time at the client when the request departed for the server, in 64-bit NTP timestamp format.
Receive Timestamp
Time at the server when the request arrived from the client, in 64-bit NTP timestamp format.
Transmit Timestamp
Time at the server when the response left for the client, in 64-bit NTP timestamp format.
Key Identifier
This is a 32-bit unsigned integer used by the client and server to designate a secret 128-bit
MD5 key. Together, the Key Identifier and Digest fields collectively are called message
authentication code (MAC).
Message Digest
This is a 128-bit string computed by the keyed MD5 message digest algorithm. Together, the
Key Identifier and Digest fields collectively are called message authentication code (MAC).
PING
PING is a utility for testing network connectivity to a particular IP address or URL. The user
typically sends a ping request by entering "ping" followed by the IP address or URL of the
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