I have written a program that parses a number of TrueType font tables to determine which pairs of Unicode codepoints end up using the same glyph. Some pairs share glyphs by using the same glyph IDs in the cmap table, some use composite glyphs that contain a single glyph ID, and others have the same glyph data duplicated at their locations in the glyf table.
Each codepoint in the homograph pairs is converted to Punycode and back to Unicode again to see if that character is allowed in IDNs. Pairs containing disallowed characters are removed from the table. Each row in the tables starts with a pair of codepoints, followed by the number of fonts in which that pair was found to share a glyph. Here are the tables:
IDN Homograph Pairs in TXT Format
All Homograph Pairs in TXT Format
| Glyph | Unicode | Unicode | Number of Fonts | |
| ! | 0021 | 01C3 | 2 | |
| " | 0022 | 02BA | 4 | |
| " | 0022 | 05F4 | 12 | |
| ' | 0027 | 0060 | 1 | |
| ' | 0027 | 02B9 | 4 | |
| ' | 0027 | 05F3 | 12 | |
| ' | 0027 | 2032 | 6 | |
| ( | 0028 | FD3E | 3 | |
| ) | 0029 | FD3F | 3 | |
| , | 002C | 201A | 9 | |
| - | 002D | 2010 | 12 | |
| - | 002D | 2012 | 1 | |
| - | 002D | 2013 | 2 | |
| / | 002F | 2044 | 3 | |
| / | 002F | 2215 | 4 | |
| : | 003A | 05C3 | 1 | |
| < | 003C | 2039 | 1 | |
| > | 003E | 203A | 1 | |
| I | 0049 | 04C0 | 4 | |
| O | 004F | 2D54 | 1 | |
| \ | 005C | 00A5 | 2 | |
| \ | 005C | 20A9 | 8 | |
| ` | 0060 | 0300 | 1 | |
| a | 0061 | 03B1 | 4 | |
| a | 0061 | 0430 | 52 | |
| c | 0063 | 0441 | 51 | |
| d | 0064 | 0501 | 1 | |
| e | 0065 | 0435 | 55 | |
| f | 0066 | 0192 | 1 | |
| g | 0067 | 0261 | 2 | |
| h | 0068 | 04BB | 10 | |
| i | 0069 | 0456 | 60 | |
| j | 006A | 03F3 | 3 | |
| j | 006A | 0458 | 57 | |
| m | 006D | 0442 | 15 | (all italic fonts -- special case for Cyrillic) |
| n | 006E | 043F | 13 | |
| o | 006F | 03BF | 48 | |
| o | 006F | 043E | 52 | |
| o | 006F | 0585 | 1 | |
| o | 006F | 1D0F | 1 | |
| p | 0070 | 0440 | 53 | |
| s | 0073 | 0455 | 57 | |
| u | 0075 | 0438 | 14 | |
| v | 0076 | 03BD | 27 | |
| v | 0076 | 03C5 | 1 | |
| v | 0076 | 0475 | 2 | |
| x | 0078 | 03C7 | 2 | |
| x | 0078 | 0445 | 46 | |
| y | 0079 | 0443 | 48 | |
| | | 007C | 01C0 | 1 | |
| · | 00B7 | 2219 | 45 | |
| ä | 00E4 | 04D3 | 2 | |
| æ | 00E6 | 04D5 | 4 | |
| ç | 00E7 | 04AB | 3 | |
| è | 00E8 | 0450 | 3 | |
| ë | 00EB | 0451 | 30 | |
| í | 00ED | 03AF | 2 | |
| ï | 00EF | 03CA | 14 | |
| ï | 00EF | 0457 | 28 | |
| ó | 00F3 | 03CC | 4 | |
| ö | 00F6 | 04E7 | 3 | |
| ù | 00F9 | 045D | 1 | |
| ă | 0103 | 04D1 | 2 | |
| ĕ | 0115 | 04D7 | 2 | |
| ħ | 0127 | 045B | 10 | |
| ı | 0131 | 026A | 3 | |
| ı | 0131 | 03B9 | 24 | |
| ĸ | 0138 | 03BA | 12 | |
| ĸ | 0138 | 043A | 2 | |
| ŕ | 0155 | 0453 | 1 | |
| ţ | 0163 | 01AB | 1 | |
| ţ | 0163 | 021B | 6 | |
| ū | 016B | 04E3 | 1 | |
| ƞ | 019E | 03B7 | 1 | |
| ǝ | 01DD | 0259 | 1 | |
| ǝ | 01DD | 04D9 | 1 | |
| ɑ | 0251 | 03B1 | 1 | |
| ə | 0259 | 04D9 | 21 | |
| ɛ | 025B | 03B5 | 1 | |
| ɛ | 025B | 0454 | 3 | |
| ɜ | 025C | 0437 | 1 | |
| ɩ | 0269 | 03B9 | 1 | |
| ɵ | 0275 | 04E9 | 1 | |
| ʃ | 0283 | 222B | 1 | |
| ʒ | 0292 | 04E1 | 1 | |
| ʙ | 0299 | 0432 | 1 | |
| ʜ | 029C | 043D | 1 | |
| ʹ | 02B9 | 2032 | 1 | |
| ̃ | 0303 | 0342 | 1 | |
| ̠ | 0320 | 0331 | 3 | |
| ̳ | 0333 | 0347 | 3 | |
| α | 03B1 | 0430 | 4 | |
| α | 03B1 | 237A | 1 | |
| θ | 03B8 | 2296 | 1 | |
| κ | 03BA | 043A | 5 | |
| ο | 03BF | 043E | 50 | |
| ο | 03BF | 0585 | 1 | |
| π | 03C0 | 043F | 5 | |
| τ | 03C4 | 0442 | 4 | |
| χ | 03C7 | 0445 | 3 | |
| ϊ | 03CA | 0457 | 13 | |
| ϳ | 03F3 | 0458 | 3 | |
| г | 0433 | 1D26 | 1 | |
| л | 043B | 1D2B | 1 | |
| м | 043C | 1D0D | 1 | |
| о | 043E | 0585 | 2 | |
| п | 043F | 1D28 | 1 | |
| т | 0442 | 1D1B | 1 | |
| я | 044F | 1D19 | 1 | |
| ֹ | 05B9 | 05BA | 5 | |
| ֹ | 05B9 | 05C1 | 3 | |
| ֹ | 05B9 | 05C2 | 1 | |
| ֹ | 05B9 | 05C4 | 1 | |
| ׁ | 05C1 | 05C2 | 1 | |
| ׁ | 05C1 | 05C4 | 1 | |
| ׂ | 05C2 | 05C4 | 1 | |
| ׳ | 05F3 | 2019 | 2 | |
| ״ | 05F4 | 201D | 2 | |
| ، | 060C | 066C | 8 | |
| ه | 0647 | 06D5 | 16 | |
| ى | 0649 | 06CC | 13 | |
| ٔ | 0654 | 0674 | 7 | |
| ٠ | 0660 | 06F0 | 17 | |
| ١ | 0661 | 06F1 | 18 | |
| ٢ | 0662 | 06F2 | 17 | |
| ٣ | 0663 | 06F3 | 18 | |
| ٧ | 0667 | 06F7 | 18 | |
| ٨ | 0668 | 06F8 | 18 | |
| ٩ | 0669 | 06F9 | 18 | |
| ۟ | 06DF | 06EC | 7 | |
| ۦ | 06E6 | 06E7 | 1 | |
| ܼ | 073C | 0742 | 1 | |
| ़ | 093C | 09BC | 1 | |
| ० | 0966 | 0AE6 | 1 | |
| २ | 0968 | 0AE8 | 1 | |
| ३ | 0969 | 0AE9 | 1 | |
| ४ | 096A | 0AEA | 1 | |
| ८ | 096E | 0AEE | 1 | |
| ঃ | 0983 | 0A03 | 1 | |
| ਼ | 0A3C | 0ABC | 1 | |
| ਼ | 0A3C | 0B3C | 1 | |
| ઼ | 0ABC | 0B3C | 1 | |
| அ | 0B85 | 0BEE | 1 | |
| எ | 0B8E | 0BED | 1 | |
| க | 0B95 | 0BE7 | 1 | |
| ள | 0BB3 | 0BD7 | 2 | |
| ൌ | 0D4C | 0D57 | 1 | |
| ဝ | 101D | 1040 | 1 | |
| ᄀ | 1100 | 11A8 | 9 | |
| ᄁ | 1101 | 11A9 | 9 | |
| ᄂ | 1102 | 11AB | 9 | |
| ᄃ | 1103 | 11AE | 9 | |
| ᄅ | 1105 | 11AF | 9 | |
| ᄆ | 1106 | 11B7 | 9 | |
| ᄇ | 1107 | 11B8 | 9 | |
| ᄉ | 1109 | 11BA | 9 | |
| ᄊ | 110A | 11BB | 8 | |
| ᄋ | 110B | 11BC | 9 | |
| ᄌ | 110C | 11BD | 9 | |
| ᄎ | 110E | 11BE | 9 | |
| ᄏ | 110F | 11BF | 7 | |
| ᄐ | 1110 | 11C0 | 9 | |
| ᄑ | 1111 | 11C1 | 9 | |
| ᄒ | 1112 | 11C2 | 7 | |
| ᄓ | 1113 | 11C5 | 7 | |
| ᄕ | 1115 | 11C6 | 9 | |
| ᄗ | 1117 | 11CA | 5 | |
| ᄘ | 1118 | 11CD | 5 | |
| ᄙ | 1119 | 11D0 | 7 | |
| ᄚ | 111A | 113B | 1 | |
| ᄚ | 111A | 11B6 | 5 | |
| ᄜ | 111C | 11DC | 5 | |
| ᄝ | 111D | 11E2 | 6 | |
| ᄡ | 1121 | 11B9 | 8 | |
| ᄫ | 112B | 11E6 | 7 | |
| ᄭ | 112D | 11E7 | 7 | |
| ᄯ | 112F | 11E8 | 9 | |
| ᄰ | 1130 | 11E9 | 7 | |
| ᄲ | 1132 | 11EA | 7 | |
| ᅀ | 1140 | 11EB | 9 | |
| ᅁ | 1141 | 11EC | 3 | |
| ᅅ | 1145 | 11F1 | 1 | |
| ᅆ | 1146 | 11F2 | 1 | |
| ᅇ | 1147 | 11EE | 5 | |
| ᅌ | 114C | 11F0 | 5 | |
| ᅖ | 1156 | 11F3 | 3 | |
| ᅗ | 1157 | 11F4 | 7 | |
| ᅙ | 1159 | 11F9 | 5 | |
| ᆄ | 1184 | 1186 | 1 | |
| ᐡ | 1421 | 14D1 | 1 | |
| ᐷ | 1437 | 1440 | 1 | |
| ᑔ | 1454 | 145D | 1 | |
| ᕁ | 1541 | 157D | 1 | |
| អ | 17A2 | 17A3 | 1 | |
| ᡜ | 185C | 1896 | 1 | |
| ᴘ | 1D18 | 1D29 | 1 | |
| ‒ | 2012 | 2013 | 3 | |
| — | 2014 | 2015 | 6 | |
| — | 2014 | 2212 | 3 | |
| ― | 2015 | 2500 | 2 | |
| ‖ | 2016 | 2225 | 2 | |
| ‘ | 2018 | 201B | 1 | |
| ’ | 2019 | 201B | 2 | |
| ’ | 2019 | 2032 | 1 | |
| ‛ | 201B | 2032 | 1 | |
| • | 2022 | 2027 | 2 | |
| • | 2022 | 30FB | 1 | |
| ⁄ | 2044 | 2215 | 58 | |
| ⁓ | 2053 | 223C | 1 | |
| ↲ | 21B2 | 21B5 | 1 | |
| ↾ | 21BE | 2A21 | 1 | |
| ∃ | 2203 | 2D3A | 1 | |
| ∧ | 2227 | 22C0 | 1 | |
| ∨ | 2228 | 22C1 | 1 | |
| ∩ | 2229 | 22C2 | 1 | |
| ∪ | 222A | 22C3 | 1 | |
| ≡ | 2261 | 2263 | 2 | |
| ⊕ | 2295 | 2641 | 2 | |
| ⊙ | 2299 | 2609 | 2 | |
| ⊥ | 22A5 | 27C2 | 1 | |
| ⊲ | 22B2 | 25B7 | 1 | |
| ⋈ | 22C8 | 2A1D | 1 | |
| ⋿ | 22FF | 2D39 | 1 | |
| ⌙ | 2319 | 2A3D | 1 | |
| ⎈ | 2388 | 2638 | 1 | |
| ⎥ | 23A5 | 23AE | 1 | |
| ▌ | 258C | 2590 | 5 | |
| □ | 25A1 | 2610 | 1 | |
| ◎ | 25CE | 29BE | 1 | |
| ⟧ | 27E7 | 301B | 1 | |
| ⦚ | 299A | 29D9 | 1 | |
| ⧄ | 29C4 | 303C | 1 | |
| ⺫ | 2EAB | 7F52 | 1 | |
| ぺ | 307A | 30DA | 1 | |
| 㖈 | 3588 | 439B | 1 | |
| 㩁 | 3A41 | 6409 | 1 | |
| 㫚 | 3ADA | 66F6 | 1 | |
| 㬵 | 3B35 | 80F6 | 1 | |
| 㬻 | 3B3B | 4420 | 1 | |
| 䀿 | 403F | 6663 | 1 | |
| 䚶 | 46B6 | 8A1E | 1 | |
| 併 | 4F75 | 5002 | 1 | |
| 値 | 5024 | 503C | 1 | |
| 啓 | 5553 | 555F | 1 | |
| 塡 | 5861 | 586B | 1 | |
| 墫 | 58AB | 58FF | 2 | |
| 媯 | 5AAF | 5B00 | 1 | |
| 帡 | 5E21 | 5E32 | 1 | |
| 愈 | 6108 | FA88 | 1 | |
| 慠 | 6160 | FA8A | 1 | |
| 搜 | 641C | FA8E | 1 | |
| 敖 | 6556 | FA90 | 1 | |
| 晚 | 665A | 6669 | 1 | |
| 朌 | 670C | 80A6 | 2 | |
| 朏 | 670F | 80D0 | 1 | |
| 朐 | 6710 | 80CA | 1 | |
| 朓 | 6713 | 8101 | 1 | |
| 朘 | 6718 | 8127 | 1 | |
| 朣 | 6723 | 81A7 | 3 | |
| 杮 | 676E | 67FF | 3 | |
| 榝 | 699D | 6A27 | 1 | |
| 殺 | 6BBA | FA96 | 1 | |
| 溈 | 6E88 | 6F59 | 1 | |
| 瀞 | 701E | FA9B | 1 | |
| 盛 | 76DB | FAA7 | 1 | |
| 研 | 7814 | 784F | 1 | |
| 磌 | 78CC | FAAB | 1 | |
| 絕 | 7D55 | 7D76 | 1 | |
| 缾 | 7F3E | FAB1 | 1 | |
| 胼 | 80FC | 8141 | 1 | |
| 蒍 | 848D | 853F | 1 | |
| 蘷 | 8637 | 8641 | 1 | |
| 蝹 | 8779 | FAB5 | 1 | |
| 襁 | 8941 | FAB6 | 1 | |
| 訮 | 8A2E | 8A7D | 1 | |
| 諭 | 8AED | FABE | 1 | |
| 讆 | 8B86 | 8B8F | 1 | |
| 赿 | 8D7F | 8D86 | 2 | |
| 跥 | 8DE5 | 8DFA | 1 | |
| 躗 | 8E97 | 8E9B | 1 | |
| 軿 | 8EFF | 8F27 | 1 | |
| 輸 | 8F38 | FAC2 | 1 | |
| 醙 | 9199 | FAC4 | 1 | |
| 鎭 | 93AD | 93AE | 1 | |
| 頻 | 983B | FACC | 1 | |
| 鹂 | 9E42 | 9E43 | 1 | |
| ꁊ | A04A | A49E | 1 | |
| ꁐ | A050 | A4AC | 1 | |
| ꃀ | A0C0 | A49C | 1 | |
| ꉙ | A259 | A4BF | 1 | |
| ꊱ | A2B1 | A4BE | 1 | |
| ꎫ | A3AB | A4C0 | 1 | |
| ꎵ | A3B5 | A4C2 | 1 | |
| ꎿ | A3BF | A4BA | 1 | |
| ꏂ | A3C2 | A4B0 | 1 |