diff --git a/degesch.c b/degesch.c
index e0497aa..7e16205 100644
--- a/degesch.c
+++ b/degesch.c
@@ -3134,8 +3134,19 @@ static const int g_mirc_to_terminal[] =
 	[MIRC_L_GRAY]   = COLOR_256         (WHITE,   252),
 };
 
-// TODO: support more colors, see https://modern.ircdocs.horse/formatting.html
-//   + http://anti.teamidiot.de/static/nei/*/extended_mirc_color_proposal.html
+// https://modern.ircdocs.horse/formatting.html
+// http://anti.teamidiot.de/static/nei/*/extended_mirc_color_proposal.html
+static const char g_extra_to_256[100 - 16] =
+{
+	 52,  94, 100,  58,  22,  29,  23,  24,  17,  54,  53,  89,
+	 88, 130, 142,  64,  28,  35,  30,  25,  18,  91,  90, 125,
+	124, 166, 184, 106,  34,  49,  37,  33,  19, 129, 127, 161,
+	196, 208, 226, 154,  46,  86 , 51,  75,  21, 171, 201, 198,
+	203, 215, 227, 191,  83, 122,  87, 111,  63, 177, 207, 205,
+	217, 223, 229, 193, 157, 158, 159, 153, 147, 183, 219, 212,
+	 16, 233, 235, 237, 239, 241, 244, 247, 250, 254, 231,  -1
+};
+
 static const char *
 formatter_parse_mirc_color (struct formatter *self, const char *s)
 {
@@ -3149,8 +3160,11 @@ formatter_parse_mirc_color (struct formatter *self, const char *s)
 	int fg = *s++ - '0';
 	if (isdigit_ascii (*s))
 		fg = fg * 10 + (*s++ - '0');
-	if (fg >= 0 && fg < 16)
+	if (fg < 16)
 		FORMATTER_ADD_ITEM (self, FG_COLOR, .color = g_mirc_to_terminal[fg]);
+	else
+		FORMATTER_ADD_ITEM (self, FG_COLOR,
+			.color = COLOR_256 (DEFAULT, g_extra_to_256[fg]));
 
 	if (*s != ',' || !isdigit_ascii (s[1]))
 		return s;
@@ -3159,8 +3173,11 @@ formatter_parse_mirc_color (struct formatter *self, const char *s)
 	int bg = *s++ - '0';
 	if (isdigit_ascii (*s))
 		bg = bg * 10 + (*s++ - '0');
-	if (bg >= 0 && bg < 16)
+	if (bg < 16)
 		FORMATTER_ADD_ITEM (self, BG_COLOR, .color = g_mirc_to_terminal[bg]);
+	else
+		FORMATTER_ADD_ITEM (self, BG_COLOR,
+			.color = COLOR_256 (DEFAULT, g_extra_to_256[bg]));
 
 	return s;
 }