0 = 00000000 1 = 00000001 2 = 00000010 3 = 00000011 4 = 00000100 5 = 00000101 6 = 00000110 7 = 00000111 8 = 00001000 9 = 00001001 A = 00001010 B = 00001100 C = 00001101 D = 00001110 E = 00001111 F = 00010000 Format of CIDR block and then total addresses. /0 has 340,282,366,920,938,463,463,374,607,431,768,211,456 /1 has 170,141,183,460,469,231,731,687,303,715,884,105,728 /2 has 85,070,591,730,234,615,865,843,651,857,942,052,864 /3 has 42,535,295,865,117,307,932,921,825,928,921,026,432 /4 has 21,267,647,932,558,653,966,460,912,964,485,513,216 /5 has 10,633,823,966,279,326,983,230,456,482,242,756,608 /6 has 5,316,911,983,139,663,491,615,228,241,121,378,304 /7 has 2,658,455,991,569,831,745,807,614,120,560,689,152 /8 has 1,329,227,995,784,915,872,903,807,060,280,344,576 /9 has 664,613,997,892,457,936,451,903,530,140,172,288 /10 has 332,306,998,946,228,968,225,951,765,070,086,144 /11 has 166,153,499,473,114,484,112,975,882,535,043,072 /12 has 83,076,749,736,557,242,056,487,941,267,521,536 /13 has 41,538,374,868,278,621,028,243,970,633,760,768 /14 has 20,769,187,434,139,310,514,121,985,316,880,384 /15 has 10,384,593,717,069,655,257,060,992,658,440,192 /16 has 5,192,296,858,534,827,628,530,496,329,220,096 /17 has 2,596,148,429,267,413,814,265,248,164,610,048 /18 has 1,298,074,214,633,706,907,132,624,082,305,024 /19 has 649,037,107,316,853,453,566,312,041,152,512 /20 has 324,518,553,658,426,726,783,156,020,576,256 /21 has 162,259,276,829,213,363,391,578,010,288,128 /22 has 81,129,638,414,606,681,695,789,005,144,064 /23 has 40,564,819,207,303,340,847,894,502,572,032 /24 has 20,282,409,603,651,670,423,947,251,286,016 /25 has 10,141,204,801,825,835,211,973,625,643,008 /26 has 5,070,602,400,912,917,605,986,812,821,504 /27 has 2,535,301,200,456,458,802,993,406,410,752 /28 has 1,267,650,600,228,229,401,496,703,205,376 /29 has 633,825,300,114,114,700,748,351,602,688 /30 has 316,912,650,057,057,350,374,175,801,344 /31 has 158,456,325,028,528,675,187,087,900,672 /32 has 79,228,162,514,264,337,593,543,950,336 /33 has 39,614,081,257,132,168,796,771,975,168 /34 has 19,807,040,628,566,084,398,385,987,584 /35 has 9,903,520,314,283,042,199,192,993,792 /36 has 4,951,760,157,141,521,099,596,496,896 /37 has 2,475,880,078,570,760,549,798,248,448 /38 has 1,237,940,039,285,380,274,899,124,224 /39 has 618,970,019,642,690,137,449,562,112 /40 has 309,485,009,821,345,068,724,781,056 /41 has 154,742,504,910,672,534,362,390,528 /42 has 77,371,252,455,336,267,181,195,264 /43 has 38,685,626,227,668,133,590,597,632 /44 has 19,342,813,113,834,066,795,298,816 /45 has 9,671,406,556,917,033,397,649,408 /46 has 4,835,703,278,458,516,698,824,704 /47 has 2,417,851,639,229,258,349,412,352 /48 has 1,208,925,819,614,629,174,706,176 /49 has 604,462,909,807,314,587,353,088 /50 has 302,231,454,903,657,293,676,544 /51 has 151,115,727,451,828,646,838,272 /52 has 75,557,863,725,914,323,419,136 /53 has 37,778,931,862,957,161,709,568 /54 has 18,889,465,931,478,580,854,784 /55 has 9,444,732,965,739,290,427,392 /56 has 4,722,366,482,869,645,213,696 /57 has 2,361,183,241,434,822,606,848 /58 has 1,180,591,620,717,411,303,424 /59 has 590,295,810,358,705,651,712 /60 has 295,147,905,179,352,825,856 /61 has 147,573,952,589,676,412,928 /62 has 73,786,976,294,838,206,464 /63 has 36,893,488,147,419,103,232 /64 has 18,446,744,073,709,551,616 /65 has 9,223,372,036,854,775,808 /66 has 4,611,686,018,427,387,904 /67 has 2,305,843,009,213,693,952 /68 has 1,152,921,504,606,846,976 /69 has 576,460,752,303,423,488 /70 has 288,230,376,151,711,744 /71 has 144,115,188,075,855,872 /72 has 72,057,594,037,927,936 /73 has 36,028,797,018,963,968 /74 has 18,014,398,509,481,984 /75 has 9,007,199,254,740,992 /76 has 4,503,599,627,370,496 /77 has 2,251,799,813,685,248 /78 has 1,125,899,906,842,624 /79 has 562,949,953,421,312 /80 has 281,474,976,710,656 /81 has 140,737,488,355,328 /82 has 70,368,744,177,664 /83 has 35,184,372,088,832 /84 has 17,592,186,044,416 /85 has 8,796,093,022,208 /86 has 4,398,046,511,104 /87 has 2,199,023,255,552 /88 has 1,099,511,627,776 /89 has 549,755,813,888 /90 has 274,877,906,944 /91 has 137,438,953,472 /92 has 68,719,476,736 /93 has 34,359,738,368 /94 has 17,179,869,184 /95 has 8,589,934,592 /96 has 4,294,967,296 /97 has 2,147,483,648 /98 has 1,073,741,824 /99 has 536,870,912 /100 has 268,435,456 /101 has 134,217,728 /102 has 67,108,864 /103 has 33,554,432 /104 has 16,777,216 /105 has 8,388,608 /106 has 4,194,304 /107 has 2,097,152 /108 has 1,048,576 /109 has 524,288 /110 has 262,144 /111 has 131,072 /112 has 65,536 /113 has 32,768 /114 has 16,384 /115 has 8,192 /116 has 4,096 /117 has 2,048 /118 has 1,024 /119 has 512 /120 has 256 /121 has 128 /122 has 64 /123 has 32 /124 has 16 /125 has 8 /126 has 4 /127 has 2 /128 has 1