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The value of reach column in ntpq -p or peer command inside ntpq shell represents the status of the last 8 NTP transactions between the NTP daemon and a given remote time server. It is an octal representation. Each bit in its binary representation is a boolean value, where a 1 indicates a successful transaction and a 0 indicates a failure. Each time a new transaction is made, the bits are shifted left by one position and the latest value would be recorded as the rightest bit.

For example, if 7 transactions are success and the latest transaction is failed, the binary representation is 11111110, and the octal number is 376.

For example, if the value of reach is 350. The binary representation is: 11110000, meaning that the last 4 transactions are failed.

If the value of reach is 377, the binary representation is 11111111, meaning that the last 8 transactions are successful.