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Browse the IPv4 Address Space

All 256 top-level /8 blocks (0.0.0.0/8 – 255.0.0.0/8). Each links to its CIDR detail — owner, RIR, ASN, sub-ranges and reverse DNS.

0.0.0.0/8 reserved 1.0.0.0/8 APNIC 2.0.0.0/8 RIPE 3.0.0.0/8 ARIN 4.0.0.0/8 ARIN 5.0.0.0/8 RIPE 6.0.0.0/8 ARIN 7.0.0.0/8 ARIN 8.0.0.0/8 ARIN 9.0.0.0/8 ARIN 10.0.0.0/8 reserved 11.0.0.0/8 ARIN 12.0.0.0/8 ARIN 13.0.0.0/8 ARIN 14.0.0.0/8 APNIC 15.0.0.0/8 ARIN 16.0.0.0/8 ARIN 17.0.0.0/8 ARIN 18.0.0.0/8 ARIN 19.0.0.0/8 ARIN 20.0.0.0/8 ARIN 21.0.0.0/8 ARIN 22.0.0.0/8 ARIN 23.0.0.0/8 ARIN 24.0.0.0/8 ARIN 25.0.0.0/8 RIPE 26.0.0.0/8 ARIN 27.0.0.0/8 APNIC 28.0.0.0/8 ARIN 29.0.0.0/8 ARIN 30.0.0.0/8 ARIN 31.0.0.0/8 RIPE 32.0.0.0/8 ARIN 33.0.0.0/8 ARIN 34.0.0.0/8 ARIN 35.0.0.0/8 ARIN 36.0.0.0/8 APNIC 37.0.0.0/8 RIPE 38.0.0.0/8 ARIN 39.0.0.0/8 APNIC 40.0.0.0/8 ARIN 41.0.0.0/8 AFRINIC 42.0.0.0/8 APNIC 43.0.0.0/8 APNIC 44.0.0.0/8 ARIN 45.0.0.0/8 ARIN 46.0.0.0/8 RIPE 47.0.0.0/8 ARIN 48.0.0.0/8 ARIN 49.0.0.0/8 APNIC 50.0.0.0/8 ARIN 51.0.0.0/8 RIPE 52.0.0.0/8 ARIN 53.0.0.0/8 RIPE 54.0.0.0/8 ARIN 55.0.0.0/8 ARIN 56.0.0.0/8 ARIN 57.0.0.0/8 RIPE 58.0.0.0/8 APNIC 59.0.0.0/8 APNIC 60.0.0.0/8 APNIC 61.0.0.0/8 APNIC 62.0.0.0/8 RIPE 63.0.0.0/8 ARIN 64.0.0.0/8 ARIN 65.0.0.0/8 ARIN 66.0.0.0/8 ARIN 67.0.0.0/8 ARIN 68.0.0.0/8 ARIN 69.0.0.0/8 ARIN 70.0.0.0/8 ARIN 71.0.0.0/8 ARIN 72.0.0.0/8 ARIN 73.0.0.0/8 ARIN 74.0.0.0/8 ARIN 75.0.0.0/8 ARIN 76.0.0.0/8 ARIN 77.0.0.0/8 RIPE 78.0.0.0/8 RIPE 79.0.0.0/8 RIPE 80.0.0.0/8 RIPE 81.0.0.0/8 RIPE 82.0.0.0/8 RIPE 83.0.0.0/8 RIPE 84.0.0.0/8 RIPE 85.0.0.0/8 RIPE 86.0.0.0/8 RIPE 87.0.0.0/8 RIPE 88.0.0.0/8 RIPE 89.0.0.0/8 RIPE 90.0.0.0/8 RIPE 91.0.0.0/8 RIPE 92.0.0.0/8 RIPE 93.0.0.0/8 RIPE 94.0.0.0/8 RIPE 95.0.0.0/8 RIPE 96.0.0.0/8 ARIN 97.0.0.0/8 ARIN 98.0.0.0/8 ARIN 99.0.0.0/8 ARIN 100.0.0.0/8 ARIN 101.0.0.0/8 APNIC 102.0.0.0/8 APNIC 103.0.0.0/8 APNIC 104.0.0.0/8 ARIN 105.0.0.0/8 AFRINIC 106.0.0.0/8 APNIC 107.0.0.0/8 ARIN 108.0.0.0/8 ARIN 109.0.0.0/8 RIPE 110.0.0.0/8 APNIC 111.0.0.0/8 APNIC 112.0.0.0/8 APNIC 113.0.0.0/8 APNIC 114.0.0.0/8 APNIC 115.0.0.0/8 APNIC 116.0.0.0/8 APNIC 117.0.0.0/8 APNIC 118.0.0.0/8 APNIC 119.0.0.0/8 APNIC 120.0.0.0/8 APNIC 121.0.0.0/8 APNIC 122.0.0.0/8 APNIC 123.0.0.0/8 APNIC 124.0.0.0/8 APNIC 125.0.0.0/8 APNIC 126.0.0.0/8 APNIC 127.0.0.0/8 reserved 128.0.0.0/8 ARIN 129.0.0.0/8 ARIN 130.0.0.0/8 ARIN 131.0.0.0/8 ARIN 132.0.0.0/8 ARIN 133.0.0.0/8 APNIC 134.0.0.0/8 ARIN 135.0.0.0/8 ARIN 136.0.0.0/8 ARIN 137.0.0.0/8 ARIN 138.0.0.0/8 ARIN 139.0.0.0/8 ARIN 140.0.0.0/8 ARIN 141.0.0.0/8 RIPE 142.0.0.0/8 ARIN 143.0.0.0/8 ARIN 144.0.0.0/8 ARIN 145.0.0.0/8 RIPE 146.0.0.0/8 ARIN 147.0.0.0/8 ARIN 148.0.0.0/8 ARIN 149.0.0.0/8 ARIN 150.0.0.0/8 APNIC 151.0.0.0/8 RIPE 152.0.0.0/8 ARIN 153.0.0.0/8 APNIC 154.0.0.0/8 AFRINIC 155.0.0.0/8 ARIN 156.0.0.0/8 ARIN 157.0.0.0/8 ARIN 158.0.0.0/8 ARIN 159.0.0.0/8 ARIN 160.0.0.0/8 ARIN 161.0.0.0/8 ARIN 162.0.0.0/8 ARIN 163.0.0.0/8 APNIC 164.0.0.0/8 ARIN 165.0.0.0/8 ARIN 166.0.0.0/8 ARIN 167.0.0.0/8 ARIN 168.0.0.0/8 ARIN 169.0.0.0/8 ARIN 170.0.0.0/8 ARIN 171.0.0.0/8 APNIC 172.0.0.0/8 ARIN 173.0.0.0/8 ARIN 174.0.0.0/8 ARIN 175.0.0.0/8 APNIC 176.0.0.0/8 RIPE 177.0.0.0/8 LACNIC 178.0.0.0/8 RIPE 179.0.0.0/8 LACNIC 180.0.0.0/8 APNIC 181.0.0.0/8 LACNIC 182.0.0.0/8 APNIC 183.0.0.0/8 APNIC 184.0.0.0/8 ARIN 185.0.0.0/8 RIPE 186.0.0.0/8 LACNIC 187.0.0.0/8 LACNIC 188.0.0.0/8 RIPE 189.0.0.0/8 LACNIC 190.0.0.0/8 LACNIC 191.0.0.0/8 LACNIC 192.0.0.0/8 ARIN 193.0.0.0/8 RIPE 194.0.0.0/8 RIPE 195.0.0.0/8 RIPE 196.0.0.0/8 AFRINIC 197.0.0.0/8 AFRINIC 198.0.0.0/8 ARIN 199.0.0.0/8 ARIN 200.0.0.0/8 LACNIC 201.0.0.0/8 LACNIC 202.0.0.0/8 APNIC 203.0.0.0/8 APNIC 204.0.0.0/8 ARIN 205.0.0.0/8 ARIN 206.0.0.0/8 ARIN 207.0.0.0/8 ARIN 208.0.0.0/8 ARIN 209.0.0.0/8 ARIN 210.0.0.0/8 APNIC 211.0.0.0/8 APNIC 212.0.0.0/8 RIPE 213.0.0.0/8 RIPE 214.0.0.0/8 reserved 215.0.0.0/8 reserved 216.0.0.0/8 ARIN 217.0.0.0/8 RIPE 218.0.0.0/8 APNIC 219.0.0.0/8 APNIC 220.0.0.0/8 APNIC 221.0.0.0/8 APNIC 222.0.0.0/8 APNIC 223.0.0.0/8 APNIC 224.0.0.0/8 reserved 225.0.0.0/8 reserved 226.0.0.0/8 reserved 227.0.0.0/8 reserved 228.0.0.0/8 reserved 229.0.0.0/8 reserved 230.0.0.0/8 reserved 231.0.0.0/8 reserved 232.0.0.0/8 reserved 233.0.0.0/8 reserved 234.0.0.0/8 reserved 235.0.0.0/8 reserved 236.0.0.0/8 reserved 237.0.0.0/8 reserved 238.0.0.0/8 reserved 239.0.0.0/8 reserved 240.0.0.0/8 reserved 241.0.0.0/8 reserved 242.0.0.0/8 reserved 243.0.0.0/8 reserved 244.0.0.0/8 reserved 245.0.0.0/8 reserved 246.0.0.0/8 reserved 247.0.0.0/8 reserved 248.0.0.0/8 reserved 249.0.0.0/8 reserved 250.0.0.0/8 reserved 251.0.0.0/8 reserved 252.0.0.0/8 reserved 253.0.0.0/8 reserved 254.0.0.0/8 reserved 255.0.0.0/8 reserved

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