diff --git a/scanner.go b/scanner.go
index 54c4637..c8077e9 100644
--- a/scanner.go
+++ b/scanner.go
@@ -196,4 +196,4 @@ func isLetter(ch rune) bool { return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && c
 // isDigit returns true if the rune is a digit.
 func isDigit(ch rune) bool { return (ch >= '0' && ch <= '9') }
 
-func isMisc(ch rune) bool { return (ch == '.' || ch == '/' || ch == '-' || ch == '_') }
+func isMisc(ch rune) bool { return (ch == '.' || ch == '/' || ch == '-' || ch == '_' || ch == ':') }
diff --git a/scanner_test.go b/scanner_test.go
index bbcd03c..8f19a67 100644
--- a/scanner_test.go
+++ b/scanner_test.go
@@ -27,6 +27,7 @@ func TestScanner_Scan(t *testing.T) {
 		{s: `"hello \"my\" friend bla\`, tok: COMMENT, lit: "hello \\\"my\\\" friend bla\\"},
 		{s: "hello friend", tok: IDENT, lit: "hello"},
 		{s: "192.168.178.2/24", tok: IDENT, lit: "192.168.178.2/24"},
+		{s: "2001:db8::/64", tok: IDENT, lit: "2001:db8::/64"},
 		{s: "# 192.168.178.2/24", tok: COMMENTLINE, lit: " 192.168.178.2/24"},
 		{s: "I_test_rule-something", tok: IDENT, lit: "I_test_rule-something"},
 	} {