The results below are complete, since the LMFDB contains all groups of order at most 2000 except orders larger than 500 that are multiples of 128
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| Label | Name | Order | Exponent | $\card{\mathrm{conj}(G)}$ | Center | Type - length |
|---|---|---|---|---|---|---|
| 256.1 | $C_{256}$ | $2^{8}$ | $2^{8}$ | 256 | $C_{256}$ | Cyclic |
| 256.2 | $C_4.C_8^2$ | $2^{8}$ | $2^{3}$ | 88 | $C_2^2\times C_4$ | Nilpotent - 2 |
| 256.3 | $C_4.C_8^2$ | $2^{8}$ | $2^{3}$ | 112 | $C_2\times C_4^2$ | Nilpotent - 3 |
| 256.4 | $C_2^2.C_8^2$ | $2^{8}$ | $2^{3}$ | 88 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.5 | $(C_2\times C_4^2):C_8$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.6 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.7 | $C_4^3.C_2^2$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.8 | $(C_2^2\times C_8):C_8$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.9 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.10 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.11 | $C_4^3.C_2^2$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.12 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 64 | $C_2^3$ | Nilpotent - 3 |
| 256.13 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^4$ | Nilpotent - 3 |
| 256.14 | $(C_2\times \OD_{16}):C_8$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.15 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.16 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.17 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.18 | $C_4^3.C_2^2$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.19 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 76 | $C_2^2\times C_4$ | Nilpotent - 3 |
| 256.20 | $C_2^4.C_4^2$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.21 | $C_2^4.C_4^2$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.22 | $C_2^4.C_4^2$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.23 | $C_2^4.D_8$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.24 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.25 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.26 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.27 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.28 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.29 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.30 | $C_4^3.C_2^2$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.31 | $C_4^3.C_2^2$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.32 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.33 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.34 | $(C_2\times C_4^2).D_4$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.35 | $C_2^5.Q_8$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.36 | $C_4^3.C_2^2$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.37 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.38 | $C_4^2.D_8$ | $2^{8}$ | $2^{3}$ | 52 | $C_2^3$ | Nilpotent - 3 |
| 256.39 | $C_{16}^2$ | $2^{8}$ | $2^{4}$ | 256 | $C_{16}^2$ | Abelian - 2 |
| 256.40 | $C_{16}:C_{16}$ | $2^{8}$ | $2^{4}$ | 160 | $C_8^2$ | Nilpotent - 2 |
| 256.41 | $C_{16}:C_{16}$ | $2^{8}$ | $2^{4}$ | 88 | $C_4^2$ | Nilpotent - 2 |
| 256.42 | $C_2^4:C_{16}$ | $2^{8}$ | $2^{4}$ | 52 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.43 | $C_2^3.\OD_{32}$ | $2^{8}$ | $2^{4}$ | 52 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.44 | $(C_2\times D_4):C_{16}$ | $2^{8}$ | $2^{4}$ | 52 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.45 | $(C_2\times Q_8):C_{16}$ | $2^{8}$ | $2^{4}$ | 52 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.46 | $C_2^4.\OD_{16}$ | $2^{8}$ | $2^{4}$ | 46 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.47 | $C_2^4.\OD_{16}$ | $2^{8}$ | $2^{4}$ | 46 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.48 | $(C_2^2\times C_8).D_4$ | $2^{8}$ | $2^{4}$ | 46 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.49 | $(C_2^2\times C_8).D_4$ | $2^{8}$ | $2^{4}$ | 46 | $C_2\times C_4$ | Nilpotent - 4 |
| 256.50 | $C_4^2:C_{16}$ | $2^{8}$ | $2^{4}$ | 52 | $C_2\times C_4$ | Nilpotent - 4 |