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+# (S)NTP - (Simple) Network Time Protocol - RFCs 1305 and 2030
+# Pattern attributes: good fast fast overmatch
+# Protocol groups: time_synchronization ietf_draft_standard
+# Wiki: http://www.protocolinfo.org/wiki/NTP
+# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
+#
+# This pattern is tested and is believed to work.
+
+# client|server
+# Requires the server's timestamp to be in the present or future (of 2005).
+# Tested with ntpdate on Linux.
+# Assumes version 2, 3 or 4.
+
+# Note that ntp packets are always 48 bytes, so you should match on that too.
+
+ntp
+^([\x13\x1b\x23\xd3\xdb\xe3]|[\x14\x1c$].......?.?.?.?.?.?.?.?.?[\xc6-\xff])
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