/26.........255.255.255.192..........2^2=4...............และ 2^6=64
11111111.11111111.11111111.11000000

บิต...เลขฐานสอง......Network ID...Broadcast...IPUsage
0......00000000.........0................63..............1-62
1......00000001.........64.............127...........65-126
2......00000010........128............191..........129-190
3......00000011.........192...........255..........193254

...........................................................................................


/27.......255.255.255.224........2^3=8..........และ 2^5=32
11111111.11111111.11111111.11100000

บิต.....เลขฐานสอง......Network ID.....Broadcast......IP Usage
0........00000000..............0.............31....................1-30
1.........00000001.............32............63...................33-62
2.........00000010.............64............95...................65-94
3.........00000011.............96...........127..................97-126
4.........00000100............128..........159...............129-158
5.........00000101.............160.........191................161-190
6.........00000110.............192.........223................193-222
7..........00000111.............224.........256...............225255

...........................................................................................

/28.........255.255.255.240 = 2^4 =16 และ 2^4=16
11111111.11111111.11111111.11110000

บิต...เลขฐานสอง ....Network ID......broad cast....IP Usage
0....00000000.........0...........................15...............1-14
1....00000001........16..........................31.............17-30
2....00000010........32.........................63.............33-62
3....00000011.........64..........................79.............65-78
4....00000100.......80..........................95.............81-94
5....00000101.........96........................127.............97-126
6....00000110........128.......................159...........129-158
7....00000111........160.......................191...........160-190
8....00001000.......192.......................207...........193-206
9....00001001.......208.......................223...........209-222
10..00001010.......224.......................239...........225-238
11..00001011........240.......................255...........241-254
12..00001100.......256........................271...........257-270
13..00001101........272........................287..........273-286
14...00001110.......288........................303.........289-302
15...00001111........304........................319..........305318


................................................................................................

/29.......255.255.255.248=2^5=32และ 2^3=8
11111111.11111111.11111111.11111000

บิต....เลขฐานสอง......Network ID........Brodcast....IP Usage
0.....00000000.........0........................7..................1 -6
1.....00000001.........8.......................15.................9-14
2.....00000010.........16.....................23.................17-22
3.....00000011.........24.....................31.................25-30
4.....00000100.........32.....................39.................33-38
5.....00000101.........40.....................47.................41-46
6.....00000110.........48.....................55.................49-54
7.....00000111.........56.....................63.................57-62
8.....00001000.........64.....................71.................65-70
9.....00001001.........72.....................79.................73-78
10...00001010.........80.....................87................. 81-86
11...00001011.........88.....................95.................89-94
12...00001100.........96.....................103...............97-102
13...00001101........104....................111...............105-110
14...00001110........112....................119...............113-118
15...00001111........120....................127...............121-126
16...00010000........128....................135...............129-134
17...00010001........136....................143...............137-142
18...00010010........144....................151...............145-150
19...00010011........152....................159...............153-158
20...00010100........160....................167...............161-166
21...00010101........168....................175...............169-174
22...00010110........176....................183...............177-182
23...00010111........184....................191...............185-190
24...00011000........192....................199...............193-198
25...00011001........200....................207...............201-206
26...00011010........208....................215...............209-214
27...00011011........216....................223...............217-222
28...00011100........224....................231...............225-230
29...00011101........232....................239...............233-240
30...00011110........240....................247...............241-248
31...00011111........248....................255...............249256

................................................................................................

/30.......255.255.255.252=2^6=64 และ 2^2=4
11111111.11111111.11111111.11111100

บิต....เลขฐานสอง........Network ID........Broadcast....IP Usage
0......00000000...............0............................3................12
1.......00000001...............4............................7................5-6
2.......00000010...............8...........................11...............9-10
3.......00000011..............12..........................15...............13-14
4.......00000100..............16.........................19...............17-18
5.......00000101...............20........................23...............21-22
6.......00000110...............24........................27...............25-26
7.......00000111................28........................31...............29-30
8......00001000................32........................35...............33-34
9......00001001.................36.......................39................37-38
10....00001010.................40.......................43................41-42
11....00001011..................44.......................47.................45-46
12....00001100.................48.......................51.................49-50
13....00001101..................52.......................55.................53-54
14....00001110..................56.......................59..................57-58
15....00001111..................60.......................63..................61-62
16....00010000................64.......................67...................65-66
17....00010001.................68.......................71...................69-70
18....00010010.................72.......................75...................73-74
19....00010011.................76.......................79....................77-78
20...00010100.................80......................83....................81-82
21....00010101.................84......................87....................85-86
22....00010110................88.......................91....................89-90
23....00010111.................92......................95....................93-94
24....00011000................96......................99....................97-98
25....00011001...............100....................103.................101-102
26....00011010...............104....................107.................105-106
27....00011011................108....................111.................109-110
28....00011100...............112.....................115.................113-114
29....00011101...............116......................119.................117-118
30....00011110...............120.....................123.................121-122
31.....00011111...............124.....................127..................125-126
32....00100000..............128.....................131..................129-130
33....00100001...............132....................135..................133-134
34....00100010...............136....................139..................137-138
35....00100011................140...................143..................141-142
36....00100100...............144....................147..................145-146
37....00100101................148....................151..................149-150
38....00100110................152....................155..................153-154
39....00100111................156....................159...................157-158
40....00101000..............160....................163...................161-162
41....00101001...............164....................167...................165-166
42....00101010...............168....................171...................169-170
43....00101011................172....................175...................173-174
44....00101100................176...................179...................177-178
45....00101101................180...................183...................181-182
46....00101110................184...................187...................185-186
47....00101111................188...................191....................189-190
48....00110000..............192...................195....................193-194
49....00110001..............196...................199.....................197-198
50....00110010.............200...................203....................201-202
51.....00110011.............204...................207....................205-206
52.....00110100............208....................211....................209-210
53.....00110101.............212....................215....................213-214
54.....00110110.............216....................219....................217-218
55.....00110111.............220....................223....................221-222
56.....00111000............224....................227....................225-226
57.....00111001.............228....................231....................229-230
58.....00111010.............232....................235...................233-234
59.....00111011.............236....................239....................237-238
60.....00111100.............240....................243...................241-242
61......00111101.............244....................247...................245-246
62......00111110.............248....................251...................249-250
63......00111111..............252...................255...................253254

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