FREE · NETWORK & IT INFRASTRUCTURE
IPv6 Subnet Planner.
Plan an IPv6 prefix across sites: allocate nibble-aligned site prefixes from the number of /64 networks each needs and list every /64.
CALCULATED IN YOUR BROWSER · NOTHING IS UPLOADED
Sites allocated5 / 52001:db8:abcd::/48
- /64 subnets in the prefix
- 65,536
- /64 subnets requested
- 267
- Reverse zone of the prefix
- d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa
Site allocation
| Site | /64s needed | Site prefix | /64 capacity | First /64 | Last /64 used |
|---|---|---|---|---|---|
| Headquarters | 40 | 2001:db8:abcd::/56 | 256 | 2001:db8:abcd::/64 | 2001:db8:abcd:27::/64 |
| Data centre | 200 | 2001:db8:abcd:100::/56 | 256 | 2001:db8:abcd:100::/64 | 2001:db8:abcd:1c7::/64 |
| Branch Paris | 12 | 2001:db8:abcd:200::/60 | 16 | 2001:db8:abcd:200::/64 | 2001:db8:abcd:20b::/64 |
| Branch Madrid | 12 | 2001:db8:abcd:210::/60 | 16 | 2001:db8:abcd:210::/64 | 2001:db8:abcd:21b::/64 |
| Lab | 3 | 2001:db8:abcd:220::/60 | 16 | 2001:db8:abcd:220::/64 | 2001:db8:abcd:222::/64 |
Every /64 assignment
| Site | # | Subnet |
|---|---|---|
| Headquarters | 1 | 2001:db8:abcd::/64 |
| Headquarters | 2 | 2001:db8:abcd:1::/64 |
| Headquarters | 3 | 2001:db8:abcd:2::/64 |
| Headquarters | 4 | 2001:db8:abcd:3::/64 |
| Headquarters | 5 | 2001:db8:abcd:4::/64 |
| Headquarters | 6 | 2001:db8:abcd:5::/64 |
| Headquarters | 7 | 2001:db8:abcd:6::/64 |
| Headquarters | 8 | 2001:db8:abcd:7::/64 |
| Headquarters | 9 | 2001:db8:abcd:8::/64 |
| Headquarters | 10 | 2001:db8:abcd:9::/64 |
| Headquarters | 11 | 2001:db8:abcd:a::/64 |
| Headquarters | 12 | 2001:db8:abcd:b::/64 |
| Headquarters | 13 | 2001:db8:abcd:c::/64 |
| Headquarters | 14 | 2001:db8:abcd:d::/64 |
| Headquarters | 15 | 2001:db8:abcd:e::/64 |
| Headquarters | 16 | 2001:db8:abcd:f::/64 |
| Headquarters | 17 | 2001:db8:abcd:10::/64 |
| Headquarters | 18 | 2001:db8:abcd:11::/64 |
| Headquarters | 19 | 2001:db8:abcd:12::/64 |
| Headquarters | 20 | 2001:db8:abcd:13::/64 |
| Headquarters | 21 | 2001:db8:abcd:14::/64 |
| Headquarters | 22 | 2001:db8:abcd:15::/64 |
| Headquarters | 23 | 2001:db8:abcd:16::/64 |
| Headquarters | 24 | 2001:db8:abcd:17::/64 |
| Headquarters | 25 | 2001:db8:abcd:18::/64 |
| Headquarters | 26 | 2001:db8:abcd:19::/64 |
| Headquarters | 27 | 2001:db8:abcd:1a::/64 |
| Headquarters | 28 | 2001:db8:abcd:1b::/64 |
| Headquarters | 29 | 2001:db8:abcd:1c::/64 |
| Headquarters | 30 | 2001:db8:abcd:1d::/64 |
| Headquarters | 31 | 2001:db8:abcd:1e::/64 |
| Headquarters | 32 | 2001:db8:abcd:1f::/64 |
| Headquarters | 33 | 2001:db8:abcd:20::/64 |
| Headquarters | 34 | 2001:db8:abcd:21::/64 |
| Headquarters | 35 | 2001:db8:abcd:22::/64 |
| Headquarters | 36 | 2001:db8:abcd:23::/64 |
| Headquarters | 37 | 2001:db8:abcd:24::/64 |
| Headquarters | 38 | 2001:db8:abcd:25::/64 |
| Headquarters | 39 | 2001:db8:abcd:26::/64 |
| Headquarters | 40 | 2001:db8:abcd:27::/64 |
| Data centre | 1 | 2001:db8:abcd:100::/64 |
| Data centre | 2 | 2001:db8:abcd:101::/64 |
| Data centre | 3 | 2001:db8:abcd:102::/64 |
| Data centre | 4 | 2001:db8:abcd:103::/64 |
| Data centre | 5 | 2001:db8:abcd:104::/64 |
| Data centre | 6 | 2001:db8:abcd:105::/64 |
| Data centre | 7 | 2001:db8:abcd:106::/64 |
| Data centre | 8 | 2001:db8:abcd:107::/64 |
| Data centre | 9 | 2001:db8:abcd:108::/64 |
| Data centre | 10 | 2001:db8:abcd:109::/64 |
| Data centre | 11 | 2001:db8:abcd:10a::/64 |
| Data centre | 12 | 2001:db8:abcd:10b::/64 |
| Data centre | 13 | 2001:db8:abcd:10c::/64 |
| Data centre | 14 | 2001:db8:abcd:10d::/64 |
| Data centre | 15 | 2001:db8:abcd:10e::/64 |
| Data centre | 16 | 2001:db8:abcd:10f::/64 |
| Data centre | 17 | 2001:db8:abcd:110::/64 |
| Data centre | 18 | 2001:db8:abcd:111::/64 |
| Data centre | 19 | 2001:db8:abcd:112::/64 |
| Data centre | 20 | 2001:db8:abcd:113::/64 |
| Data centre | 21 | 2001:db8:abcd:114::/64 |
| Data centre | 22 | 2001:db8:abcd:115::/64 |
| Data centre | 23 | 2001:db8:abcd:116::/64 |
| Data centre | 24 | 2001:db8:abcd:117::/64 |
| Data centre | 25 | 2001:db8:abcd:118::/64 |
| Data centre | 26 | 2001:db8:abcd:119::/64 |
| Data centre | 27 | 2001:db8:abcd:11a::/64 |
| Data centre | 28 | 2001:db8:abcd:11b::/64 |
| Data centre | 29 | 2001:db8:abcd:11c::/64 |
| Data centre | 30 | 2001:db8:abcd:11d::/64 |
| Data centre | 31 | 2001:db8:abcd:11e::/64 |
| Data centre | 32 | 2001:db8:abcd:11f::/64 |
| Data centre | 33 | 2001:db8:abcd:120::/64 |
| Data centre | 34 | 2001:db8:abcd:121::/64 |
| Data centre | 35 | 2001:db8:abcd:122::/64 |
| Data centre | 36 | 2001:db8:abcd:123::/64 |
| Data centre | 37 | 2001:db8:abcd:124::/64 |
| Data centre | 38 | 2001:db8:abcd:125::/64 |
| Data centre | 39 | 2001:db8:abcd:126::/64 |
| Data centre | 40 | 2001:db8:abcd:127::/64 |
| Data centre | 41 | 2001:db8:abcd:128::/64 |
| Data centre | 42 | 2001:db8:abcd:129::/64 |
| Data centre | 43 | 2001:db8:abcd:12a::/64 |
| Data centre | 44 | 2001:db8:abcd:12b::/64 |
| Data centre | 45 | 2001:db8:abcd:12c::/64 |
| Data centre | 46 | 2001:db8:abcd:12d::/64 |
| Data centre | 47 | 2001:db8:abcd:12e::/64 |
| Data centre | 48 | 2001:db8:abcd:12f::/64 |
| Data centre | 49 | 2001:db8:abcd:130::/64 |
| Data centre | 50 | 2001:db8:abcd:131::/64 |
| Data centre | 51 | 2001:db8:abcd:132::/64 |
| Data centre | 52 | 2001:db8:abcd:133::/64 |
| Data centre | 53 | 2001:db8:abcd:134::/64 |
| Data centre | 54 | 2001:db8:abcd:135::/64 |
| Data centre | 55 | 2001:db8:abcd:136::/64 |
| Data centre | 56 | 2001:db8:abcd:137::/64 |
| Data centre | 57 | 2001:db8:abcd:138::/64 |
| Data centre | 58 | 2001:db8:abcd:139::/64 |
| Data centre | 59 | 2001:db8:abcd:13a::/64 |
| Data centre | 60 | 2001:db8:abcd:13b::/64 |
| Data centre | 61 | 2001:db8:abcd:13c::/64 |
| Data centre | 62 | 2001:db8:abcd:13d::/64 |
| Data centre | 63 | 2001:db8:abcd:13e::/64 |
| Data centre | 64 | 2001:db8:abcd:13f::/64 |
| Data centre | 65 | 2001:db8:abcd:140::/64 |
| Data centre | 66 | 2001:db8:abcd:141::/64 |
| Data centre | 67 | 2001:db8:abcd:142::/64 |
| Data centre | 68 | 2001:db8:abcd:143::/64 |
| Data centre | 69 | 2001:db8:abcd:144::/64 |
| Data centre | 70 | 2001:db8:abcd:145::/64 |
| Data centre | 71 | 2001:db8:abcd:146::/64 |
| Data centre | 72 | 2001:db8:abcd:147::/64 |
| Data centre | 73 | 2001:db8:abcd:148::/64 |
| Data centre | 74 | 2001:db8:abcd:149::/64 |
| Data centre | 75 | 2001:db8:abcd:14a::/64 |
| Data centre | 76 | 2001:db8:abcd:14b::/64 |
| Data centre | 77 | 2001:db8:abcd:14c::/64 |
| Data centre | 78 | 2001:db8:abcd:14d::/64 |
| Data centre | 79 | 2001:db8:abcd:14e::/64 |
| Data centre | 80 | 2001:db8:abcd:14f::/64 |
| Data centre | 81 | 2001:db8:abcd:150::/64 |
| Data centre | 82 | 2001:db8:abcd:151::/64 |
| Data centre | 83 | 2001:db8:abcd:152::/64 |
| Data centre | 84 | 2001:db8:abcd:153::/64 |
| Data centre | 85 | 2001:db8:abcd:154::/64 |
| Data centre | 86 | 2001:db8:abcd:155::/64 |
| Data centre | 87 | 2001:db8:abcd:156::/64 |
| Data centre | 88 | 2001:db8:abcd:157::/64 |
| Data centre | 89 | 2001:db8:abcd:158::/64 |
| Data centre | 90 | 2001:db8:abcd:159::/64 |
| Data centre | 91 | 2001:db8:abcd:15a::/64 |
| Data centre | 92 | 2001:db8:abcd:15b::/64 |
| Data centre | 93 | 2001:db8:abcd:15c::/64 |
| Data centre | 94 | 2001:db8:abcd:15d::/64 |
| Data centre | 95 | 2001:db8:abcd:15e::/64 |
| Data centre | 96 | 2001:db8:abcd:15f::/64 |
| Data centre | 97 | 2001:db8:abcd:160::/64 |
| Data centre | 98 | 2001:db8:abcd:161::/64 |
| Data centre | 99 | 2001:db8:abcd:162::/64 |
| Data centre | 100 | 2001:db8:abcd:163::/64 |
| Data centre | 101 | 2001:db8:abcd:164::/64 |
| Data centre | 102 | 2001:db8:abcd:165::/64 |
| Data centre | 103 | 2001:db8:abcd:166::/64 |
| Data centre | 104 | 2001:db8:abcd:167::/64 |
| Data centre | 105 | 2001:db8:abcd:168::/64 |
| Data centre | 106 | 2001:db8:abcd:169::/64 |
| Data centre | 107 | 2001:db8:abcd:16a::/64 |
| Data centre | 108 | 2001:db8:abcd:16b::/64 |
| Data centre | 109 | 2001:db8:abcd:16c::/64 |
| Data centre | 110 | 2001:db8:abcd:16d::/64 |
| Data centre | 111 | 2001:db8:abcd:16e::/64 |
| Data centre | 112 | 2001:db8:abcd:16f::/64 |
| Data centre | 113 | 2001:db8:abcd:170::/64 |
| Data centre | 114 | 2001:db8:abcd:171::/64 |
| Data centre | 115 | 2001:db8:abcd:172::/64 |
| Data centre | 116 | 2001:db8:abcd:173::/64 |
| Data centre | 117 | 2001:db8:abcd:174::/64 |
| Data centre | 118 | 2001:db8:abcd:175::/64 |
| Data centre | 119 | 2001:db8:abcd:176::/64 |
| Data centre | 120 | 2001:db8:abcd:177::/64 |
| Data centre | 121 | 2001:db8:abcd:178::/64 |
| Data centre | 122 | 2001:db8:abcd:179::/64 |
| Data centre | 123 | 2001:db8:abcd:17a::/64 |
| Data centre | 124 | 2001:db8:abcd:17b::/64 |
| Data centre | 125 | 2001:db8:abcd:17c::/64 |
| Data centre | 126 | 2001:db8:abcd:17d::/64 |
| Data centre | 127 | 2001:db8:abcd:17e::/64 |
| Data centre | 128 | 2001:db8:abcd:17f::/64 |
| Data centre | 129 | 2001:db8:abcd:180::/64 |
| Data centre | 130 | 2001:db8:abcd:181::/64 |
| Data centre | 131 | 2001:db8:abcd:182::/64 |
| Data centre | 132 | 2001:db8:abcd:183::/64 |
| Data centre | 133 | 2001:db8:abcd:184::/64 |
| Data centre | 134 | 2001:db8:abcd:185::/64 |
| Data centre | 135 | 2001:db8:abcd:186::/64 |
| Data centre | 136 | 2001:db8:abcd:187::/64 |
| Data centre | 137 | 2001:db8:abcd:188::/64 |
| Data centre | 138 | 2001:db8:abcd:189::/64 |
| Data centre | 139 | 2001:db8:abcd:18a::/64 |
| Data centre | 140 | 2001:db8:abcd:18b::/64 |
| Data centre | 141 | 2001:db8:abcd:18c::/64 |
| Data centre | 142 | 2001:db8:abcd:18d::/64 |
| Data centre | 143 | 2001:db8:abcd:18e::/64 |
| Data centre | 144 | 2001:db8:abcd:18f::/64 |
| Data centre | 145 | 2001:db8:abcd:190::/64 |
| Data centre | 146 | 2001:db8:abcd:191::/64 |
| Data centre | 147 | 2001:db8:abcd:192::/64 |
| Data centre | 148 | 2001:db8:abcd:193::/64 |
| Data centre | 149 | 2001:db8:abcd:194::/64 |
| Data centre | 150 | 2001:db8:abcd:195::/64 |
| Data centre | 151 | 2001:db8:abcd:196::/64 |
| Data centre | 152 | 2001:db8:abcd:197::/64 |
| Data centre | 153 | 2001:db8:abcd:198::/64 |
| Data centre | 154 | 2001:db8:abcd:199::/64 |
| Data centre | 155 | 2001:db8:abcd:19a::/64 |
| Data centre | 156 | 2001:db8:abcd:19b::/64 |
| Data centre | 157 | 2001:db8:abcd:19c::/64 |
| Data centre | 158 | 2001:db8:abcd:19d::/64 |
| Data centre | 159 | 2001:db8:abcd:19e::/64 |
| Data centre | 160 | 2001:db8:abcd:19f::/64 |
| Data centre | 161 | 2001:db8:abcd:1a0::/64 |
| Data centre | 162 | 2001:db8:abcd:1a1::/64 |
| Data centre | 163 | 2001:db8:abcd:1a2::/64 |
| Data centre | 164 | 2001:db8:abcd:1a3::/64 |
| Data centre | 165 | 2001:db8:abcd:1a4::/64 |
| Data centre | 166 | 2001:db8:abcd:1a5::/64 |
| Data centre | 167 | 2001:db8:abcd:1a6::/64 |
| Data centre | 168 | 2001:db8:abcd:1a7::/64 |
| Data centre | 169 | 2001:db8:abcd:1a8::/64 |
| Data centre | 170 | 2001:db8:abcd:1a9::/64 |
| Data centre | 171 | 2001:db8:abcd:1aa::/64 |
| Data centre | 172 | 2001:db8:abcd:1ab::/64 |
| Data centre | 173 | 2001:db8:abcd:1ac::/64 |
| Data centre | 174 | 2001:db8:abcd:1ad::/64 |
| Data centre | 175 | 2001:db8:abcd:1ae::/64 |
| Data centre | 176 | 2001:db8:abcd:1af::/64 |
| Data centre | 177 | 2001:db8:abcd:1b0::/64 |
| Data centre | 178 | 2001:db8:abcd:1b1::/64 |
| Data centre | 179 | 2001:db8:abcd:1b2::/64 |
| Data centre | 180 | 2001:db8:abcd:1b3::/64 |
| Data centre | 181 | 2001:db8:abcd:1b4::/64 |
| Data centre | 182 | 2001:db8:abcd:1b5::/64 |
| Data centre | 183 | 2001:db8:abcd:1b6::/64 |
| Data centre | 184 | 2001:db8:abcd:1b7::/64 |
| Data centre | 185 | 2001:db8:abcd:1b8::/64 |
| Data centre | 186 | 2001:db8:abcd:1b9::/64 |
| Data centre | 187 | 2001:db8:abcd:1ba::/64 |
| Data centre | 188 | 2001:db8:abcd:1bb::/64 |
| Data centre | 189 | 2001:db8:abcd:1bc::/64 |
| Data centre | 190 | 2001:db8:abcd:1bd::/64 |
| Data centre | 191 | 2001:db8:abcd:1be::/64 |
| Data centre | 192 | 2001:db8:abcd:1bf::/64 |
| Data centre | 193 | 2001:db8:abcd:1c0::/64 |
| Data centre | 194 | 2001:db8:abcd:1c1::/64 |
| Data centre | 195 | 2001:db8:abcd:1c2::/64 |
| Data centre | 196 | 2001:db8:abcd:1c3::/64 |
| Data centre | 197 | 2001:db8:abcd:1c4::/64 |
| Data centre | 198 | 2001:db8:abcd:1c5::/64 |
| Data centre | 199 | 2001:db8:abcd:1c6::/64 |
| Data centre | 200 | 2001:db8:abcd:1c7::/64 |
| Branch Paris | 1 | 2001:db8:abcd:200::/64 |
| Branch Paris | 2 | 2001:db8:abcd:201::/64 |
| Branch Paris | 3 | 2001:db8:abcd:202::/64 |
| Branch Paris | 4 | 2001:db8:abcd:203::/64 |
| Branch Paris | 5 | 2001:db8:abcd:204::/64 |
| Branch Paris | 6 | 2001:db8:abcd:205::/64 |
| Branch Paris | 7 | 2001:db8:abcd:206::/64 |
| Branch Paris | 8 | 2001:db8:abcd:207::/64 |
| Branch Paris | 9 | 2001:db8:abcd:208::/64 |
| Branch Paris | 10 | 2001:db8:abcd:209::/64 |
| Branch Paris | 11 | 2001:db8:abcd:20a::/64 |
| Branch Paris | 12 | 2001:db8:abcd:20b::/64 |
| Branch Madrid | 1 | 2001:db8:abcd:210::/64 |
| Branch Madrid | 2 | 2001:db8:abcd:211::/64 |
| Branch Madrid | 3 | 2001:db8:abcd:212::/64 |
| Branch Madrid | 4 | 2001:db8:abcd:213::/64 |
| Branch Madrid | 5 | 2001:db8:abcd:214::/64 |
| Branch Madrid | 6 | 2001:db8:abcd:215::/64 |
| Branch Madrid | 7 | 2001:db8:abcd:216::/64 |
| Branch Madrid | 8 | 2001:db8:abcd:217::/64 |
| Branch Madrid | 9 | 2001:db8:abcd:218::/64 |
| Branch Madrid | 10 | 2001:db8:abcd:219::/64 |
| Branch Madrid | 11 | 2001:db8:abcd:21a::/64 |
| Branch Madrid | 12 | 2001:db8:abcd:21b::/64 |
| Lab | 1 | 2001:db8:abcd:220::/64 |
| Lab | 2 | 2001:db8:abcd:221::/64 |
| Lab | 3 | 2001:db8:abcd:222::/64 |
- Every LAN segment gets a /64, which SLAAC requires. Largest sites are placed first so each prefix stays aligned.
- Common guidance (RIPE-690) is a /48 per organisation site and a /56 for small sites or homes.
How to use IPv6 Subnet Planner
Enter the prefix from your provider or registry, then one line per site with the number of /64 LAN segments. Keep nibble rounding on for readable addresses and reverse DNS.
How it works
Each site needs a power of two of /64s; its prefix is 64 − ceil(log2(n)), rounded down to a multiple of 4 when nibble alignment is on. Sites are placed largest first so each prefix stays aligned.
Example
In 2001:db8:abcd::/48, a data centre needing 200 /64s receives a /56, headquarters with 40 a /56 (nibble-aligned) and a lab with 3 a /60.
Questions about IPv6 Subnet Planner
Is IPv6 Subnet Planner free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Prefix must be /64 or shorter. The per-/64 table lists up to 4,096 rows in the CSV. Everything is calculated in your browser; nothing is sent or probed on the network. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.