by R David Decker and may or may not be correct... Use as a guide and for planning your network.
June 1998
| Network Address | Broadcast Address | Subnet Mask | Bits -Slash | Max IPs | Useable addresses |
| ___.___.___.0 | ___.___.___.255 | 255.255.255.0 | /24 | 256 | ___.___.___.1 - 254 |
| ___.___.___.0 | ___.___.___.127 | 255.255.255.128 | /25 | 128 | ___.___.___.1-126 |
| ___.___.___.0 | ___.___.___.63 | 255.255.255.192 | /26 | 64 | ___.___.___.1-62 |
| ___.___.___.0 | ___.___.___.31 | 255.255.255.224 | /27 | 32 | ___.___.___.1-30 |
| ___.___.___.0 | ___.___.___.15 | 255.255.255.240 | /28 | 16 | ___.___.___.1-14 |
| ___.___.___.0 | ___.___.___.7 | 255.255.255.248 | /29 | 8 | ___.___.___.1-6 |
| ___.___.___.0 | ___.___.___.3 | 255.255.255.252 | /30 | 4 | ___.___.___.1-2 |
| ___.___.___.4 | ___.___.___.7 | 255.255.255.252 | /30 | 4 | ___.___.___.5-6 |
| ___.___.___.8 | ___.___.___.15 | 255.255.255.248 | /29 | 8 | ___.___.___.9-14 |
| ___.___.___.8 | ___.___.___.11 | 255.255.255.252 | /30 | 4 | ___.___.___.9-10 |
| ___.___.___.12 | ___.___.___.15 | 255.255.255.252 | /30 | 4 | ___.___.___.13-14 |
| ___.___.___.16 | ___.___.___.31 | 255.255.255.240 | /28 | 16 | ___.___.___.17-30 |
| ___.___.___.16 | ___.___.___.23 | 255.255.255.248 | /29 | 8 | ___.___.___.17-22 |
| ___.___.___.16 | ___.___.___.19 | 255.255.255.252 | /30 | 4 | ___.___.___.17-18 |
| ___.___.___.20 | ___.___.___.23 | 255.255.255.252 | /30 | 4 | ___.___.___.21-22 |
| ___.___.___.24 | ___.___.___.31 | 255.255.255.248 | /29 | 8 | ___.___.___.25-30 |
| ___.___.___.24 | ___.___.___.27 | 255.255.255.252 | /30 | 4 | ___.___.___.25-26 |
| ___.___.___.28 | ___.___.___.31 | 255.255.255.252 | /30 | 4 | ___.___.___.29-30 |
| ___.___.___.32 | ___.___.___.63 | 255.255.255.224 | /27 | 32 | ___.___.___.33-62 |
| ___.___.___.32 | ___.___.___.47 | 255.255.255.240 | /28 | 16 | ___.___.___.33-46 |
| ___.___.___.32 | ___.___.___.39 | 255.255.255.248 | /29 | 8 | ___.___.___.33-38 |
| ___.___.___.32 | ___.___.___.35 | 255.255.255.252 | /30 | 4 | ___.___.___.33-34 |
| ___.___.___.36 | ___.___.___.39 | 255.255.255.252 | /30 | 4 | ___.___.___.37-38 |
| ___.___.___.40 | ___.___.___.47 | 255.255.255.248 | /29 | 8 | ___.___.___.41-46 |
| ___.___.___.40 | ___.___.___.43 | 255.255.255.252 | /30 | 4 | ___.___.___.42-42 |
| ___.___.___.44 | ___.___.___.47 | 255.255.255.252 | /30 | 4 | ___.___.___.45-46 |
| ___.___.___.48 | ___.___.___.63 | 255.255.255.240 | /28 | 16 | ___.___.___.49-62 |
| ___.___.___.48 | ___.___.___.55 | 255.255.255.248 | /29 | 8 | ___.___.___.49-54 |
| ___.___.___.48 | ___.___.___.51 | 255.255.255.252 | /30 | 4 | ___.___.___.49-50 |
| ___.___.___.52 | ___.___.___.55 | 255.255.255.252 | /30 | 4 | ___.___.___.53-54 |
| ___.___.___.56 | ___.___.___.63 | 255.255.255.248 | /29 | 8 | ___.___.___.57-62 |
| ___.___.___.56 | ___.___.___.59 | 255.255.255.252 | /30 | 4 | ___.___.___.57-58 |
| ___.___.___.60 | ___.___.___.63 | 255.255.255.252 | /30 | 4 | ___.___.___.61-62 |
| ___.___.___.64 | ___.___.___.127 | 255.255.255.192 | /26 | 64 | ___.___.___.65-126 |
| ___.___.___.64 | ___.___.___.95 | 255.255.255.224 | /27 | 32 | ___.___.___.65-94 |
| ___.___.___.64 | ___.___.___.79 | 255.255.255.240 | /28 | 16 | ___.___.___.65-78 |
| ___.___.___.64 | ___.___.___.71 | 255.255.255.248 | /29 | 8 | ___.___.___.65-70 |
| ___.___.___.64 | ___.___.___.67 | 255.255.255.252 | /30 | 4 | ___.___.___.65-66 |
| ___.___.___.68 | ___.___.___.71 | 255.255.255.252 | /30 | 4 | ___.___.___.69-70 |
| ___.___.___.72 | ___.___.___.79 | 255.255.255.248 | /29 | 8 | ___.___.___.73-78 |
| ___.___.___.72 | ___.___.___.75 | 255.255.255.252 | /30 | 4 | ___.___.___.73-74 |
| ___.___.___.76 | ___.___.___.79 | 255.255.255.252 | /30 | 4 | ___.___.___.77-78 |
| ___.___.___.80 | ___.___.___.95 | 255.255.255.240 | /28 | 16 | ___.___.___.81-94 |
| ___.___.___.80 | ___.___.___.87 | 255.255.255.248 | /29 | 8 | ___.___.___.81-86 |
| ___.___.___.80 | ___.___.___.83 | 255.255.255.252 | /30 | 4 | ___.___.___.81-82 |
| ___.___.___.84 | ___.___.___.87 | 255.255.255.252 | /30 | 4 | ___.___.___.85-86 |
| ___.___.___.88 | ___.___.___.95 | 255.255.255.248 | /29 | 8 | ___.___.___.89-94 |
| ___.___.___.88 | ___.___.___.91 | 255.255.255.252 | /30 | 4 | ___.___.___.89-90 |
| ___.___.___.92 | ___.___.___.95 | 255.255.255.252 | /30 | 4 | ___.___.___.93-94 |
| ___.___.___.96 | ___.___.___.127 | 255.255.255.224 | /27 | 32 | ___.___.___.97-126 |
| ___.___.___.96 | ___.___.___.111 | 255.255.255.240 | /28 | 16 | ___.___.___.97-110 |
| ___.___.___.96 | ___.___.___.103 | 255.255.255.248 | /29 | 8 | ___.___.___.97-102 |
| ___.___.___.96 | ___.___.___.99 | 255.255.255.252 | /30 | 4 | ___.___.___.97-98 |
| ___.___.___.100 | ___.___.___.103 | 255.255.255.252 | /30 | 4 | ___.___.___.101-102 |
| ___.___.___.104 | ___.___.___.111 | 255.255.255.248 | /29 | 8 | ___.___.___.105-110 |
| ___.___.___.104 | ___.___.___.107 | 255.255.255.252 | /30 | 4 | ___.___.___.105-106 |
| ___.___.___.108 | ___.___.___.111 | 255.255.255.252 | /30 | 4 | ___.___.___.109-110 |
| ___.___.___.112 | ___.___.___.127 | 255.255.255.240 | /28 | 16 | ___.___.___.113-126 |
| ___.___.___.112 | ___.___.___.119 | 255.255.255.248 | /29 | 8 | ___.___.___.113-118 |
| ___.___.___.112 | ___.___.___.115 | 255.255.255.252 | /30 | 4 | ___.___.___.113-114 |
| ___.___.___.116 | ___.___.___.119 | 255.255.255.252 | /30 | 4 | ___.___.___.117-118 |
| ___.___.___.120 | ___.___.___.127 | 255.255.255.248 | /29 | 8 | ___.___.___.121-126 |
| ___.___.___.120 | ___.___.___.123 | 255.255.255.252 | /30 | 4 | ___.___.___.121-122 |
| ___.___.___.124 | ___.___.___.127 | 255.255.255.252 | /30 | 4 | ___.___.___.125-126 |
| ___.___.___.128 | ___.___.___.255 | 255.255.255.128 | /25 | 128 | ___.___.___.129-254 |
| ___.___.___.128 | ___.___.___.191 | 255.255.255.192 | /26 | 64 | ___.___.___.129-190 |
| ___.___.___.128 | ___.___.___.159 | 255.255.255.224 | /27 | 32 | ___.___.___.129-158 |
| ___.___.___.128 | ___.___.___.143 | 255.255.255.240 | /28 | 16 | ___.___.___.129-142 |
| ___.___.___.128 | ___.___.___.135 | 255.255.255.248 | /29 | 8 | ___.___.___.129-134 |
| ___.___.___.128 | ___.___.___.131 | 255.255.255.252 | /30 | 4 | ___.___.___.129-130 |
| ___.___.___.132 | ___.___.___.135 | 255.255.255.252 | /30 | 4 | ___.___.___.133-134 |
| ___.___.___.136 | ___.___.___.143 | 255.255.255.248 | /29 | 8 | ___.___.___.137-142 |
| ___.___.___.136 | ___.___.___.139 | 255.255.255.252 | /30 | 4 | ___.___.___.137-138 |
| ___.___.___.140 | ___.___.___.143 | 255.255.255.252 | /30 | 4 | ___.___.___.141-142 |
| ___.___.___.144 | ___.___.___.159 | 255.255.255.240 | /28 | 16 | ___.___.___.145-158 |
| ___.___.___.144 | ___.___.___.151 | 255.255.255.248 | /29 | 8 | ___.___.___.145-150 |
| ___.___.___.144 | ___.___.___.147 | 255.255.255.252 | /30 | 4 | ___.___.___.145-146 |
| ___.___.___.148 | ___.___.___.151 | 255.255.255.252 | /30 | 4 | ___.___.___.149-150 |
| ___.___.___.152 | ___.___.___.159 | 255.255.255.248 | /29 | 8 | ___.___.___.153-158 |
| ___.___.___.152 | ___.___.___.155 | 255.255.255.252 | /30 | 4 | ___.___.___.153-154 |
| ___.___.___.156 | ___.___.___.159 | 255.255.255.252 | /30 | 4 | ___.___.___.157-158 |
| ___.___.___.160 | ___.___.___.191 | 255.255.255.224 | /27 | 32 | ___.___.___.161-190 |
| ___.___.___.160 | ___.___.___.175 | 255.255.255.240 | /28 | 16 | ___.___.___.161-174 |
| ___.___.___.160 | ___.___.___.167 | 255.255.255.248 | /29 | 8 | ___.___.___.161-166 |
| ___.___.___.160 | ___.___.___.163 | 255.255.255.252 | /30 | 4 | ___.___.___.161-164 |
| ___.___.___.164 | ___.___.___.167 | 255.255.255.252 | /30 | 4 | ___.___.___.165-166 |
| ___.___.___.168 | ___.___.___.175 | 255.255.255.248 | /29 | 8 | ___.___.___.169-174 |
| ___.___.___.168 | ___.___.___.171 | 255.255.255.252 | /30 | 4 | ___.___.___.169-170 |
| ___.___.___.172 | ___.___.___.175 | 255.255.255.252 | /30 | 4 | ___.___.___.173-174 |
| ___.___.___.176 | ___.___.___.191 | 255.255.255.240 | /28 | 16 | ___.___.___.177-190 |
| ___.___.___.176 | ___.___.___.183 | 255.255.255.248 | /29 | 8 | ___.___.___.177-182 |
| ___.___.___.176 | ___.___.___.179 | 255.255.255.252 | /30 | 4 | ___.___.___.177-178 |
| ___.___.___.180 | ___.___.___.183 | 255.255.255.252 | /30 | 4 | ___.___.___.181-182 |
| ___.___.___.184 | ___.___.___.191 | 255.255.255.248 | /29 | 8 | ___.___.___.185-190 |
| ___.___.___.184 | ___.___.___.187 | 255.255.255.252 | /30 | 4 | ___.___.___.185-186 |
| ___.___.___.188 | ___.___.___.191 | 255.255.255.252 | /30 | 4 | ___.___.___.189-190 |
| ___.___.___.192 | ___.___.___..255 | 255.255.255.192 | /26 | 64 | ___.___.___.193-254 |
| ___.___.___.192 | ___.___.___.223 | 255.255.255.224 | /27 | 32 | ___.___.___.193-222 |
| ___.___.___.192 | ___.___.___.207 | 255.255.255.240 | /28 | 16 | ___.___.___.193-106 |
| ___.___.___.192 | ___.___.___.199 | 255.255.255.248 | /29 | 8 | ___.___.___.193-198 |
| ___.___.___.192 | ___.___.___.195 | 255.255.255.252 | /30 | 4 | ___.___.___.193-194 |
| ___.___.___.196 | ___.___.___.199 | 255.255.255.252 | /30 | 4 | ___.___.___.197-198 |
| ___.___.___.200 | ___.___.___.207 | 255.255.255.248 | /29 | 8 | ___.___.___.201-206 |
| ___.___.___.200 | ___.___.___.203 | 255.255.255.252 | /30 | 4 | ___.___.___.201-202 |
| ___.___.___.204 | ___.___.___.207 | 255.255.255.252 | /30 | 4 | ___.___.___.205-206 |
| ___.___.___.208 | ___.___.___.223 | 255.255.255.240 | /28 | 16 | ___.___.___.209-222 |
| ___.___.___.208 | ___.___.___.215 | 255.255.255.248 | /29 | 8 | ___.___.___.209-214 |
| ___.___.___.208 | ___.___.___.211 | 255.255.255.252 | /30 | 4 | ___.___.___.209-210 |
| ___.___.___.212 | ___.___.___.215 | 255.255.255.252 | /30 | 4 | ___.___.___.213-214 |
| ___.___.___.216 | ___.___.___.223 | 255.255.255.248 | /29 | 8 | ___.___.___.217-222 |
| ___.___.___.216 | ___.___.___.219 | 255.255.255.252 | /30 | 4 | ___.___.___.217-218 |
| ___.___.___.220 | ___.___.___.223 | 255.255.255.252 | /30 | 4 | ___.___.___.221-222 |
| ___.___.___.224 | ___.___.___.255 | 255.255.255.224 | /27 | 32 | ___.___.___.225-254 |
| ___.___.___.224 | ___.___.___.239 | 255.255.255.240 | /28 | 16 | ___.___.___.225-238 |
| ___.___.___.224 | ___.___.___.231 | 255.255.255.248 | /29 | 8 | ___.___.___.225-230 |
| ___.___.___.224 | ___.___.___.227 | 255.255.255.252 | /30 | 4 | ___.___.___.225-226 |
| ___.___.___.228 | ___.___.___.231 | 255.255.255.252 | /30 | 4 | ___.___.___.229-230 |
| ___.___.___.232 | ___.___.___.239 | 255.255.255.248 | /29 | 8 | ___.___.___.233-238 |
| ___.___.___.232 | ___.___.___.235 | 255.255.255.252 | /30 | 4 | ___.___.___.233-234 |
| ___.___.___.236 | ___.___.___.239 | 255.255.255.252 | /30 | 4 | ___.___.___.237-238 |
| ___.___.___.240 | ___.___.___.255 | 255.255.255.240 | /28 | 16 | ___.___.___.241-254 |
| ___.___.___.240 | ___.___.___.247 | 255.255.255.248 | /29 | 8 | ___.___.___.241-246 |
| ___.___.___.240 | ___.___.___.243 | 255.255.255.252 | /30 | 4 | ___.___.___.241-242 |
| ___.___.___.244 | ___.___.___.247 | 255.255.255.252 | /30 | 4 | ___.___.___.245-246 |
| ___.___.___.248 | ___.___.___.255 | 255.255.255.248 | /29 | 8 | ___.___.___.249-254 |
| ___.___.___.248 | ___.___.___.251 | 255.255.255.252 | /30 | 4 | ___.___.___.249-250 |
| ___.___.___.252 | ___.___.___.255 | 255.255.255.252 | /30 | 4 | ___.___.___.253-254 |