Closest hex to #d11d11 is #c21

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#c21

d11d11

d11d11

contains c2

0c2 1c2 2c2 3c2 4c2 5c2 6c2 7c2 8c2 9c2 ac2 bc2 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c2a c2b c2c c2d c2e c2f cc2 dc2 ec2 fc2

contains 21

021 121 210 211 212 213 214 215 216 217 218 219 21a 21b 21c 21d 21e 21f 221 321 421 521 621 721 821 921 a21 b21 c21 d21 e21 f21

contains c1

0c1 1c1 2c1 3c1 4c1 5c1 6c1 7c1 8c1 9c1 ac1 bc1 c10 c11 c12 c13 c14 c15 c16 c17 c18 c19 c1a c1b c1c c1d c1e c1f cc1 dc1 ec1 fc1