IPv4 |
CIDR | Netmask | Addresses | Notes |
/32 | 255.255.255.255 | 1 | Single address |
/31 | 255.255.255.254 | 2 | |
/30 | 255.255.255.252 | 4 | |
/29 | 255.255.255.248 | 8 | |
/28 | 255.255.255.240 | 16 | |
/27 | 255.255.255.224 | 32 | |
/26 | 255.255.255.192 | 64 | |
/25 | 255.255.255.128 | 128 | |
/24 | 255.255.255.0 | 256 | Class C |
/23 | 255.255.254.0 | 512 | |
/22 | 255.255.252.0 | 1,024 | |
/21 | 255.255.248.0 | 2,048 | |
/20 | 255.255.240.0 | 4,096 | |
/19 | 255.255.224.0 | 8,192 | |
/18 | 255.255.192.0 | 16,384 | |
/17 | 255.255.128.0 | 32,768 | |
/16 | 255.255.0.0 | 65,536 | Class B |
/15 | 255.254.0.0 | 131,072 | |
/14 | 255.252.0.0 | 262,144 | |
/13 | 255.248.0.0 | 524,288 | |
/12 | 255.240.0.0 | 1,048,576 | |
/11 | 255.224.0.0 | 2,097,152 | |
/10 | 255.192.0.0 | 4,194,304 | |
/9 | 255.128.0.0 | 8,388,608 | |
/8 | 255.0.0.0 | 16,777,216 | Class A |
/7 | 254.0.0.0 | 33,554,432 | |
/6 | 252.0.0.0 | 67,108,864 | |
/5 | 248.0.0.0 | 134,217,728 | |
/4 | 240.0.0.0 | 268,435,456 | |
/3 | 224.0.0.0 | 536,870,912 | |
/2 | 192.0.0.0 | 1,073,741,824 | |
/1 | 128.0.0.0 | 2,147,483,648 | |
/0 | 0.0.0.0 | 4,294,967,296 | Entire IPv4 Space |
IPv6 |
CIDR | Netmask | Addresses | Notes |
/128 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | 1 | Single address |
/127 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe | 2 | |
/126 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffc | 4 | |
/125 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:fff8 | 8 | |
/124 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:fff0 | 16 | |
/123 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffe0 | 32 | |
/122 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffc0 | 64 | |
/121 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff80 | 128 | |
/120 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00 | 256 | |
/119 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:fe00 | 512 | |
/118 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:fc00 | 1,024 | |
/117 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:f800 | 2,048 | |
/116 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:f000 | 4,096 | |
/115 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:e000 | 8,192 | |
/114 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:c000 | 16,384 | |
/113 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:8000 | 32,768 | |
/112 | ffff:ffff:ffff:ffff:ffff:ffff:ffff:0 | 65,536 | |
/111 | ffff:ffff:ffff:ffff:ffff:ffff:fffe:0 | 131,072 | |
/110 | ffff:ffff:ffff:ffff:ffff:ffff:fffc:0 | 262,144 | |
/109 | ffff:ffff:ffff:ffff:ffff:ffff:fff8:0 | 524,288 | |
/108 | ffff:ffff:ffff:ffff:ffff:ffff:fff0:0 | 1,048,576 | |
/107 | ffff:ffff:ffff:ffff:ffff:ffff:ffe0:0 | 2,097,152 | |
/106 | ffff:ffff:ffff:ffff:ffff:ffff:ffc0:0 | 4,194,304 | |
/105 | ffff:ffff:ffff:ffff:ffff:ffff:ff80:0 | 8,388,608 | |
/104 | ffff:ffff:ffff:ffff:ffff:ffff:ff00:0 | 16,777,216 | |
/103 | ffff:ffff:ffff:ffff:ffff:ffff:fe00:0 | 33,554,432 | |
/102 | ffff:ffff:ffff:ffff:ffff:ffff:fc00:0 | 67,108,864 | |
/101 | ffff:ffff:ffff:ffff:ffff:ffff:f800:0 | 134,217,728 | |
/100 | ffff:ffff:ffff:ffff:ffff:ffff:f000:0 | 268,435,456 | |
/99 | ffff:ffff:ffff:ffff:ffff:ffff:e000:0 | 536,870,912 | |
/98 | ffff:ffff:ffff:ffff:ffff:ffff:c000:0 | 1,073,741,824 | |
/97 | ffff:ffff:ffff:ffff:ffff:ffff:8000:0 | 2,147,483,648 | |
/96 | ffff:ffff:ffff:ffff:ffff:ffff:: | 4,294,967,296 | |
/95 | ffff:ffff:ffff:ffff:ffff:fffe:: | 8,589,934,592 | |
/94 | ffff:ffff:ffff:ffff:ffff:fffc:: | 17,179,869,184 | |
/93 | ffff:ffff:ffff:ffff:ffff:fff8:: | 34,359,738,368 | |
/92 | ffff:ffff:ffff:ffff:ffff:fff0:: | 68,719,476,736 | |
/91 | ffff:ffff:ffff:ffff:ffff:ffe0:: | 137,438,953,472 | |
/90 | ffff:ffff:ffff:ffff:ffff:ffc0:: | 274,877,906,944 | |
/89 | ffff:ffff:ffff:ffff:ffff:ff80:: | 549,755,813,888 | |
/88 | ffff:ffff:ffff:ffff:ffff:ff00:: | 1,099,511,627,776 | |
/87 | ffff:ffff:ffff:ffff:ffff:fe00:: | 2,199,023,255,552 | |
/86 | ffff:ffff:ffff:ffff:ffff:fc00:: | 4,398,046,511,104 | |
/85 | ffff:ffff:ffff:ffff:ffff:f800:: | 8,796,093,022,208 | |
/84 | ffff:ffff:ffff:ffff:ffff:f000:: | 17,592,186,044,416 | |
/83 | ffff:ffff:ffff:ffff:ffff:e000:: | 35,184,372,088,832 | |
/82 | ffff:ffff:ffff:ffff:ffff:c000:: | 70,368,744,177,664 | |
/81 | ffff:ffff:ffff:ffff:ffff:8000:: | 140,737,488,355,328 | |
/80 | ffff:ffff:ffff:ffff:ffff:: | 281,474,976,710,656 | |
/79 | ffff:ffff:ffff:ffff:fffe:: | 562,949,953,421,312 | |
/78 | ffff:ffff:ffff:ffff:fffc:: | 1,125,899,906,842,624 | |
/77 | ffff:ffff:ffff:ffff:fff8:: | 2,251,799,813,685,248 | |
/76 | ffff:ffff:ffff:ffff:fff0:: | 4,503,599,627,370,496 | |
/75 | ffff:ffff:ffff:ffff:ffe0:: | 9,007,199,254,740,992 | |
/74 | ffff:ffff:ffff:ffff:ffc0:: | 18,014,398,509,481,984 | |
/73 | ffff:ffff:ffff:ffff:ff80:: | 36,028,797,018,963,968 | |
/72 | ffff:ffff:ffff:ffff:ff00:: | 72,057,594,037,927,936 | |
/71 | ffff:ffff:ffff:ffff:fe00:: | 144,115,188,075,855,872 | |
/70 | ffff:ffff:ffff:ffff:fc00:: | 288,230,376,151,711,744 | |
/69 | ffff:ffff:ffff:ffff:f800:: | 576,460,752,303,423,488 | |
/68 | ffff:ffff:ffff:ffff:f000:: | 1,152,921,504,606,846,976 | |
/67 | ffff:ffff:ffff:ffff:e000:: | 2,305,843,009,213,693,952 | |
/66 | ffff:ffff:ffff:ffff:c000:: | 4,611,686,018,427,387,904 | |
/65 | ffff:ffff:ffff:ffff:8000:: | 9,223,372,036,854,775,808 | |
/64 | ffff:ffff:ffff:ffff:: | 1.84467440737096e+19 | |
/63 | ffff:ffff:ffff:fffe:: | 3.68934881474191e+19 | |
/62 | ffff:ffff:ffff:fffc:: | 7.37869762948382e+19 | |
/61 | ffff:ffff:ffff:fff8:: | 1.47573952589676e+20 | |
/60 | ffff:ffff:ffff:fff0:: | 2.95147905179353e+20 | |
/59 | ffff:ffff:ffff:ffe0:: | 5.90295810358706e+20 | |
/58 | ffff:ffff:ffff:ffc0:: | 1.18059162071741e+21 | |
/57 | ffff:ffff:ffff:ff80:: | 2.36118324143482e+21 | |
/56 | ffff:ffff:ffff:ff00:: | 4.72236648286965e+21 | |
/55 | ffff:ffff:ffff:fe00:: | 9.44473296573929e+21 | |
/54 | ffff:ffff:ffff:fc00:: | 1.88894659314786e+22 | |
/53 | ffff:ffff:ffff:f800:: | 3.77789318629572e+22 | |
/52 | ffff:ffff:ffff:f000:: | 7.55578637259143e+22 | |
/51 | ffff:ffff:ffff:e000:: | 1.51115727451829e+23 | |
/50 | ffff:ffff:ffff:c000:: | 3.02231454903657e+23 | |
/49 | ffff:ffff:ffff:8000:: | 6.04462909807315e+23 | |
/48 | ffff:ffff:ffff:: | 1.20892581961463e+24 | |
/47 | ffff:ffff:fffe:: | 2.41785163922926e+24 | |
/46 | ffff:ffff:fffc:: | 4.83570327845852e+24 | |
/45 | ffff:ffff:fff8:: | 9.67140655691703e+24 | |
/44 | ffff:ffff:fff0:: | 1.93428131138341e+25 | |
/43 | ffff:ffff:ffe0:: | 3.86856262276681e+25 | |
/42 | ffff:ffff:ffc0:: | 7.73712524553363e+25 | |
/41 | ffff:ffff:ff80:: | 1.54742504910673e+26 | |
/40 | ffff:ffff:ff00:: | 3.09485009821345e+26 | |
/39 | ffff:ffff:fe00:: | 6.1897001964269e+26 | |
/38 | ffff:ffff:fc00:: | 1.23794003928538e+27 | |
/37 | ffff:ffff:f800:: | 2.47588007857076e+27 | |
/36 | ffff:ffff:f000:: | 4.95176015714152e+27 | |
/35 | ffff:ffff:e000:: | 9.90352031428304e+27 | |
/34 | ffff:ffff:c000:: | 1.98070406285661e+28 | |
/33 | ffff:ffff:8000:: | 3.96140812571322e+28 | |
/32 | ffff:ffff:: | 7.92281625142643e+28 | Equivalent to 1 IPv4 address |
/31 | ffff:fffe:: | 1.58456325028529e+29 | |
/30 | ffff:fffc:: | 3.16912650057057e+29 | |
/29 | ffff:fff8:: | 6.33825300114115e+29 | |
/28 | ffff:fff0:: | 1.26765060022823e+30 | |
/27 | ffff:ffe0:: | 2.53530120045646e+30 | |
/26 | ffff:ffc0:: | 5.07060240091292e+30 | |
/25 | ffff:ff80:: | 1.01412048018258e+31 | |
/24 | ffff:ff00:: | 2.02824096036517e+31 | |
/23 | ffff:fe00:: | 4.05648192073033e+31 | |
/22 | ffff:fc00:: | 8.11296384146067e+31 | |
/21 | ffff:f800:: | 1.62259276829213e+32 | |
/20 | ffff:f000:: | 3.24518553658427e+32 | |
/19 | ffff:e000:: | 6.49037107316853e+32 | |
/18 | ffff:c000:: | 1.29807421463371e+33 | |
/17 | ffff:8000:: | 2.59614842926741e+33 | |
/16 | ffff:: | 5.19229685853483e+33 | |
/15 | fffe:: | 1.03845937170697e+34 | |
/14 | fffc:: | 2.07691874341393e+34 | |
/13 | fff8:: | 4.15383748682786e+34 | |
/12 | fff0:: | 8.30767497365572e+34 | |
/11 | ffe0:: | 1.66153499473114e+35 | |
/10 | ffc0:: | 3.32306998946229e+35 | |
/9 | ff80:: | 6.64613997892458e+35 | |
/8 | ff00:: | 1.32922799578492e+36 | |
/7 | fe00:: | 2.65845599156983e+36 | |
/6 | fc00:: | 5.31691198313966e+36 | |
/5 | f800:: | 1.06338239662793e+37 | |
/4 | f000:: | 2.12676479325587e+37 | |
/3 | e000:: | 4.25352958651173e+37 | |
/2 | c000:: | 8.50705917302346e+37 | |
/1 | 8000:: | 1.70141183460469e+38 | |
/0 | :: | 3.40282366920938e+38 | Entire IPv6 Space |