Registered jack RJ21 Even-count color code

| Color | Pin_Tip | Pin_Ring | Color_ |
|---|---|---|---|
| White/Blue | 26 | 1 | Blue/White |
| White/Orange | 27 | 2 | Orange/White |
| White/Green | 28 | 3 | Green/White |
| White/Brown | 29 | 4 | Brown/White |
| White/Slate | 30 | 5 | Slate/White |
| Red/Blue | 31 | 6 | Blue/Red |
| Red/Orange | 32 | 7 | Orange/Red |
| Red/Green | 33 | 8 | Green/Red |
| Red/Brown | 34 | 9 | Brown/Red |
| Red/Slate | 35 | 10 | Slate/Red |
| Black/Blue | 36 | 11 | Blue/Black |
| Black/Orange | 37 | 12 | Orange/Black |
| Black/Green | 38 | 13 | Green/Black |
| Black/Brown | 39 | 14 | Brown/Black |
| Black/Slate | 40 | 15 | Slate/Black |
| Yellow/Blue | 41 | 16 | Blue/Yellow |
| Yellow/Orange | 42 | 17 | Orange/Yellow |
| Yellow/Green | 43 | 18 | Green/Yellow |
| Yellow/Brown | 44 | 19 | Brown/Yellow |
| Yellow/Slate | 45 | 20 | Slate/Yellow |
| Violet/Blue | 46 | 21 | Blue/Violet |
| Violet/Orange | 47 | 22 | Orange/Violet |
| Violet/Green | 48 | 23 | Green/Violet |
| Violet/Brown | 49 | 24 | Brown/Violet |
| Violet/Slate | 50 | 25 | Slate/Violet |