SUBNET MASKS

( see General Slash Masks at bottom)

1 Network with 254 Hosts (unique IPs)
Subnet Mask 255.255.255.0 (/24)
Addresses 1-254        (network number = 0; broadcast = 255)

 

2 Networks with 126 Hosts (unique IPs)
Subnet Mask 255.255.255.128 (/25)
Addresses 1-126            (network number = 0; broadcast = 127)
Addresses 129-254        (network number = 128;  broadcast = 255)

 

4 Networks with 62 Hosts (unique IPs)
Subnet Mask 255.255.255.192 (/26)
Addresses 1-62            (network number = 0; broadcast = 63)
Addresses 65-126        (network number = 64;  broadcast = 127)
Addresses 129-190      (network number = 128;   broadcast = 191)
Addresses 193-254      (network number = 192;   broadcast = 255)

 

8 Networks with 30 Hosts (unique IPs)
Subnet Mask 255.255.255.224 (/27)
Addresses 1-30           (network number = 0; broadcast = 31)
Addresses 33-62         (network number = 32;  broadcast = 63)
Addresses 65-94         (network number = 64;  broadcast = 95)
Addresses 97-126       (network number = 96;  broadcast = 127)
Addresses 129-158     (network number = 128;  broadcast = 159)
Addresses 161-190     (network number = 160;  broadcast = 191)
Addresses 193-222     (network number = 192;  broadcast = 223)
Addresses 225-254     (network number = 224;  broadcast = 255)

 

16 Networks with 14 Hosts (unique IPs)
Subnet Mask 255.255.255.240 (/28)
Addresses 1-14         (network number = 0; broadcast = 15)
Addresses 17-30       (network number = 16;  broadcast = 31)
Addresses 33-46       (network number = 32;  broadcast = 47)
Addresses 49-62       (network number = 48;  broadcast = 63)
Addresses 65-78       (network number = 64;  broadcast = 79)
Addresses 81-94       (network number = 80;  broadcast = 95)
Addresses 97-110     (network number = 96;  broadcast = 111)
Addresses 113-126   (network number = 112;  broadcast = 127)
Addresses 129-142   (network number = 128;  broadcast = 143)
Addresses 145-158   (network number = 144;  broadcast = 159)
Addresses 161-174   (network number = 160;  broadcast = 175)
Addresses 177-190   (network number = 176;  broadcast = 191)
Addresses 193-206   (network number = 192;  broadcast = 207)
Addresses 209-222   (network number = 208;  broadcast = 223)
Addresses 225-238   (network number = 224;  broadcast = 239)
Addresses 241-254   (network number = 240;  broadcast = 255)

 

32 Networks with 6 Hosts (unique IPs)
Subnet Mask 255.255.255.248 (/29)
Addresses 1-6          (network number = 0; broadcast = 7)
Addresses 9-14        (network number = 8;  broadcast = 15)
Addresses 17-22      (network number = 16;  broadcast = 23)
Addresses 25-30      (network number = 24;  broadcast = 31)
Addresses 33-38      (network number = 32;  broadcast = 39)
Addresses 41-46      (network number = 40;  broadcast = 47)
Addresses 49-54      (network number = 48;  broadcast = 55)
Addresses 57-62      (network number = 56;  broadcast = 63)
Addresses 65-70      (network number = 64;  broadcast = 71)
Addresses 73-78      (network number = 72;  broadcast = 79)
Addresses 81-86      (network number = 80;  broadcast = 87)
Addresses 89-94      (network number = 88;  broadcast = 95)
Addresses 97-102    (network number = 96;  broadcast = 103)
Addresses 105-110  (network number = 104;  broadcast = 111)
Addresses 113-118  (network number = 112;  broadcast = 119)
Addresses 121-126  (network number = 120;  broadcast = 127)
Addresses 129-134  (network number = 128;  broadcast = 135)
Addresses 137-142  (network number = 136;  broadcast = 143)
Addresses 145-150  (network number = 144;  broadcast = 151)
Addresses 153-158  (network number = 152;  broadcast = 159)
Addresses 161-166  (network number = 160;  broadcast = 167)
Addresses 169-174  (network number = 168;  broadcast = 175)
Addresses 177-182  (network number = 176;  broadcast = 183)
Addresses 185-190  (network number = 184;  broadcast = 191)
Addresses 193-198  (network number = 192;  broadcast = 199)
Addresses 201-206  (network number = 200;  broadcast = 207)
Addresses 209-214  (network number = 208;  broadcast = 215)
Addresses 217-222  (network number = 216;  broadcast = 223)
Addresses 225-230  (network number = 224;  broadcast = 231)
Addresses 233-238  (network number = 232;  broadcast = 239)
Addresses 241-246  (network number = 240;  broadcast = 247)
Addresses 249-254  (network number = 248;  broadcast = 255)

General Slash Masks

MASK   / Unique IPs
255.255.255.252 /30 4 hosts
255.255.255.248 /29 8 hosts
255.255.255.240 /28 16 hosts
255.255.255.224 /27 32 hosts
255.255.255.192 /26 64 hosts
255.255.255.128 /25 128 hosts
255.255.255.0 /24 256 hosts (Class C)
255.255.254.0 /23 2 Class C's
255.255.252.0 /22 4 Class C's
255.255.248.0 /21 8 Class C's
255.255.240.0 /20 16 Class C's
255.255.224.0 /19 32 Class C's
255.255.192.0 /18 64 Class C's
255.255.128.0 /17 128 Class C's
255.255.0.0 /16 256 Class C's (Class B)

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