Index: head/sys/ddb/db_lex.h
===================================================================
--- head/sys/ddb/db_lex.h
+++ head/sys/ddb/db_lex.h
@@ -58,17 +58,26 @@
 /*
  * Flag bit powers of two for db_read_token_flags.
  * The low 2 bits are reserved for radix selection.
+ *
+ * WSPACE: Yield explicit tWSPACE tokens when one or more whitespace characters
+ *         is consumed.
+ * HEX:    Allow tNUMBER tokens to start with 'A'-'F' without explicit "0x"
+ *         prefix.
  */
 enum {
 	_DRT_WSPACE = 2,
+	_DRT_HEX,
 };
 #ifndef BIT
 #define	BIT(n)	(1ull << (n))
 #endif
 enum {
 	DRT_WSPACE = BIT(_DRT_WSPACE),
+	DRT_HEX = BIT(_DRT_HEX),
 };
-#define	DRT_VALID_FLAGS_MASK	((int)DRT_RADIX_MASK | DRT_WSPACE)
+#define	DRT_VALID_FLAGS_MASK	((int)DRT_RADIX_MASK | \
+    DRT_WSPACE | \
+    DRT_HEX)
 
 void	 db_flush_lex(void);
 char	*db_get_line(void);
@@ -123,5 +132,7 @@
 #define	tQUESTION	33
 #define	tBIT_NOT	34
 #define	tWSPACE		35
+#define	tCOLON		36
+#define	tCOLONCOLON	37
 
 #endif /* !_DDB_DB_LEX_H_ */
Index: head/sys/ddb/db_lex.c
===================================================================
--- head/sys/ddb/db_lex.c
+++ head/sys/ddb/db_lex.c
@@ -163,7 +163,7 @@
 db_lex(int flags)
 {
 	int	c, n, radix_mode;
-	bool	lex_wspace;
+	bool	lex_wspace, lex_hex_numbers;
 
 	switch (flags & DRT_RADIX_MASK) {
 	case DRT_DEFAULT_RADIX:
@@ -181,6 +181,7 @@
 	}
 
 	lex_wspace = ((flags & DRT_WSPACE) != 0);
+	lex_hex_numbers = ((flags & DRT_HEX) != 0);
 
 	c = db_read_char();
 	for (n = 0; c <= ' ' || c > '~'; n++) {
@@ -193,13 +194,16 @@
 	    return (tWSPACE);
 	}
 
-	if (c >= '0' && c <= '9') {
+	if ((c >= '0' && c <= '9') ||
+	   (lex_hex_numbers &&
+	   ((c >= 'a' && c <= 'f') ||
+	   (c >= 'A' && c <= 'F')))) {
 	    /* number */
 	    int	r, digit = 0;
 
 	    if (radix_mode != -1)
 		r = radix_mode;
-	    else if (c > '0')
+	    else if (c != '0')
 		r = db_radix;
 	    else {
 		c = db_read_char();
@@ -328,6 +332,12 @@
 		}
 		db_unread_char(c);
 		return (tEXCL);
+	    case ':':
+		c = db_read_char();
+		if (c == ':')
+			return (tCOLONCOLON);
+		db_unread_char(c);
+		return (tCOLON);
 	    case ';':
 		return (tSEMI);
 	    case '&':