IPv6 Subnet Calculator

Enter an IPv6 address with a prefix to see its network, address range, number of /64 subnets, and its full and short forms. You can also split the prefix into smaller subnets.

Try:2001:db8:abcd::1/48 2001:db8::/32 fd00:1234::/56 fe80::1/64

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documentation2001:db8:abcd::87:0/112

network2001:db8:abcd::87:0/112

first host2001:db8:abcd::87:0

last host2001:db8:abcd::87:ffff

addresses2¹⁶ = 65,536

short form2001:db8:abcd::87:0

ipcalc 2001:db8:abcd::87:0/112

address2001:0db8:abcd:0000:0000:0000:0087:0000

network2001:0db8:abcd:0000:0000:0000:0087:0000

last host2001:0db8:abcd:0000:0000:0000:0087:ffff

green = network digits, amber = digit split by the prefix

full form2001:0db8:abcd:0000:0000:0000:0087:0000

reverse dns0.0.0.0.7.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa

/112 split into /120 · 256 subnets

close ×

#	network	last address
1	2001:db8:abcd::87:0/120	2001:db8:abcd::87:ff
2	2001:db8:abcd::87:100/120	2001:db8:abcd::87:1ff
3	2001:db8:abcd::87:200/120	2001:db8:abcd::87:2ff
4	2001:db8:abcd::87:300/120	2001:db8:abcd::87:3ff
5	2001:db8:abcd::87:400/120	2001:db8:abcd::87:4ff
6	2001:db8:abcd::87:500/120	2001:db8:abcd::87:5ff
7	2001:db8:abcd::87:600/120	2001:db8:abcd::87:6ff
8	2001:db8:abcd::87:700/120	2001:db8:abcd::87:7ff
9	2001:db8:abcd::87:800/120	2001:db8:abcd::87:8ff
10	2001:db8:abcd::87:900/120	2001:db8:abcd::87:9ff
11	2001:db8:abcd::87:a00/120	2001:db8:abcd::87:aff
12	2001:db8:abcd::87:b00/120	2001:db8:abcd::87:bff
13	2001:db8:abcd::87:c00/120	2001:db8:abcd::87:cff
14	2001:db8:abcd::87:d00/120	2001:db8:abcd::87:dff
15	2001:db8:abcd::87:e00/120	2001:db8:abcd::87:eff
16	2001:db8:abcd::87:f00/120	2001:db8:abcd::87:fff
17	2001:db8:abcd::87:1000/120	2001:db8:abcd::87:10ff
18	2001:db8:abcd::87:1100/120	2001:db8:abcd::87:11ff
19	2001:db8:abcd::87:1200/120	2001:db8:abcd::87:12ff
20	2001:db8:abcd::87:1300/120	2001:db8:abcd::87:13ff
21	2001:db8:abcd::87:1400/120	2001:db8:abcd::87:14ff
22	2001:db8:abcd::87:1500/120	2001:db8:abcd::87:15ff
23	2001:db8:abcd::87:1600/120	2001:db8:abcd::87:16ff
24	2001:db8:abcd::87:1700/120	2001:db8:abcd::87:17ff
25	2001:db8:abcd::87:1800/120	2001:db8:abcd::87:18ff
26	2001:db8:abcd::87:1900/120	2001:db8:abcd::87:19ff
27	2001:db8:abcd::87:1a00/120	2001:db8:abcd::87:1aff
28	2001:db8:abcd::87:1b00/120	2001:db8:abcd::87:1bff
29	2001:db8:abcd::87:1c00/120	2001:db8:abcd::87:1cff
30	2001:db8:abcd::87:1d00/120	2001:db8:abcd::87:1dff
31	2001:db8:abcd::87:1e00/120	2001:db8:abcd::87:1eff
32	2001:db8:abcd::87:1f00/120	2001:db8:abcd::87:1fff
33	2001:db8:abcd::87:2000/120	2001:db8:abcd::87:20ff
34	2001:db8:abcd::87:2100/120	2001:db8:abcd::87:21ff
35	2001:db8:abcd::87:2200/120	2001:db8:abcd::87:22ff
36	2001:db8:abcd::87:2300/120	2001:db8:abcd::87:23ff
37	2001:db8:abcd::87:2400/120	2001:db8:abcd::87:24ff
38	2001:db8:abcd::87:2500/120	2001:db8:abcd::87:25ff
39	2001:db8:abcd::87:2600/120	2001:db8:abcd::87:26ff
40	2001:db8:abcd::87:2700/120	2001:db8:abcd::87:27ff
41	2001:db8:abcd::87:2800/120	2001:db8:abcd::87:28ff
42	2001:db8:abcd::87:2900/120	2001:db8:abcd::87:29ff
43	2001:db8:abcd::87:2a00/120	2001:db8:abcd::87:2aff
44	2001:db8:abcd::87:2b00/120	2001:db8:abcd::87:2bff
45	2001:db8:abcd::87:2c00/120	2001:db8:abcd::87:2cff
46	2001:db8:abcd::87:2d00/120	2001:db8:abcd::87:2dff
47	2001:db8:abcd::87:2e00/120	2001:db8:abcd::87:2eff
48	2001:db8:abcd::87:2f00/120	2001:db8:abcd::87:2fff
49	2001:db8:abcd::87:3000/120	2001:db8:abcd::87:30ff
50	2001:db8:abcd::87:3100/120	2001:db8:abcd::87:31ff
51	2001:db8:abcd::87:3200/120	2001:db8:abcd::87:32ff
52	2001:db8:abcd::87:3300/120	2001:db8:abcd::87:33ff
53	2001:db8:abcd::87:3400/120	2001:db8:abcd::87:34ff
54	2001:db8:abcd::87:3500/120	2001:db8:abcd::87:35ff
55	2001:db8:abcd::87:3600/120	2001:db8:abcd::87:36ff
56	2001:db8:abcd::87:3700/120	2001:db8:abcd::87:37ff
57	2001:db8:abcd::87:3800/120	2001:db8:abcd::87:38ff
58	2001:db8:abcd::87:3900/120	2001:db8:abcd::87:39ff
59	2001:db8:abcd::87:3a00/120	2001:db8:abcd::87:3aff
60	2001:db8:abcd::87:3b00/120	2001:db8:abcd::87:3bff
61	2001:db8:abcd::87:3c00/120	2001:db8:abcd::87:3cff
62	2001:db8:abcd::87:3d00/120	2001:db8:abcd::87:3dff
63	2001:db8:abcd::87:3e00/120	2001:db8:abcd::87:3eff
64	2001:db8:abcd::87:3f00/120	2001:db8:abcd::87:3fff
65	2001:db8:abcd::87:4000/120	2001:db8:abcd::87:40ff
66	2001:db8:abcd::87:4100/120	2001:db8:abcd::87:41ff
67	2001:db8:abcd::87:4200/120	2001:db8:abcd::87:42ff
68	2001:db8:abcd::87:4300/120	2001:db8:abcd::87:43ff
69	2001:db8:abcd::87:4400/120	2001:db8:abcd::87:44ff
70	2001:db8:abcd::87:4500/120	2001:db8:abcd::87:45ff
71	2001:db8:abcd::87:4600/120	2001:db8:abcd::87:46ff
72	2001:db8:abcd::87:4700/120	2001:db8:abcd::87:47ff
73	2001:db8:abcd::87:4800/120	2001:db8:abcd::87:48ff
74	2001:db8:abcd::87:4900/120	2001:db8:abcd::87:49ff
75	2001:db8:abcd::87:4a00/120	2001:db8:abcd::87:4aff
76	2001:db8:abcd::87:4b00/120	2001:db8:abcd::87:4bff
77	2001:db8:abcd::87:4c00/120	2001:db8:abcd::87:4cff
78	2001:db8:abcd::87:4d00/120	2001:db8:abcd::87:4dff
79	2001:db8:abcd::87:4e00/120	2001:db8:abcd::87:4eff
80	2001:db8:abcd::87:4f00/120	2001:db8:abcd::87:4fff
81	2001:db8:abcd::87:5000/120	2001:db8:abcd::87:50ff
82	2001:db8:abcd::87:5100/120	2001:db8:abcd::87:51ff
83	2001:db8:abcd::87:5200/120	2001:db8:abcd::87:52ff
84	2001:db8:abcd::87:5300/120	2001:db8:abcd::87:53ff
85	2001:db8:abcd::87:5400/120	2001:db8:abcd::87:54ff
86	2001:db8:abcd::87:5500/120	2001:db8:abcd::87:55ff
87	2001:db8:abcd::87:5600/120	2001:db8:abcd::87:56ff
88	2001:db8:abcd::87:5700/120	2001:db8:abcd::87:57ff
89	2001:db8:abcd::87:5800/120	2001:db8:abcd::87:58ff
90	2001:db8:abcd::87:5900/120	2001:db8:abcd::87:59ff
91	2001:db8:abcd::87:5a00/120	2001:db8:abcd::87:5aff
92	2001:db8:abcd::87:5b00/120	2001:db8:abcd::87:5bff
93	2001:db8:abcd::87:5c00/120	2001:db8:abcd::87:5cff
94	2001:db8:abcd::87:5d00/120	2001:db8:abcd::87:5dff
95	2001:db8:abcd::87:5e00/120	2001:db8:abcd::87:5eff
96	2001:db8:abcd::87:5f00/120	2001:db8:abcd::87:5fff
97	2001:db8:abcd::87:6000/120	2001:db8:abcd::87:60ff
98	2001:db8:abcd::87:6100/120	2001:db8:abcd::87:61ff
99	2001:db8:abcd::87:6200/120	2001:db8:abcd::87:62ff
100	2001:db8:abcd::87:6300/120	2001:db8:abcd::87:63ff
101	2001:db8:abcd::87:6400/120	2001:db8:abcd::87:64ff
102	2001:db8:abcd::87:6500/120	2001:db8:abcd::87:65ff
103	2001:db8:abcd::87:6600/120	2001:db8:abcd::87:66ff
104	2001:db8:abcd::87:6700/120	2001:db8:abcd::87:67ff
105	2001:db8:abcd::87:6800/120	2001:db8:abcd::87:68ff
106	2001:db8:abcd::87:6900/120	2001:db8:abcd::87:69ff
107	2001:db8:abcd::87:6a00/120	2001:db8:abcd::87:6aff
108	2001:db8:abcd::87:6b00/120	2001:db8:abcd::87:6bff
109	2001:db8:abcd::87:6c00/120	2001:db8:abcd::87:6cff
110	2001:db8:abcd::87:6d00/120	2001:db8:abcd::87:6dff
111	2001:db8:abcd::87:6e00/120	2001:db8:abcd::87:6eff
112	2001:db8:abcd::87:6f00/120	2001:db8:abcd::87:6fff
113	2001:db8:abcd::87:7000/120	2001:db8:abcd::87:70ff
114	2001:db8:abcd::87:7100/120	2001:db8:abcd::87:71ff
115	2001:db8:abcd::87:7200/120	2001:db8:abcd::87:72ff
116	2001:db8:abcd::87:7300/120	2001:db8:abcd::87:73ff
117	2001:db8:abcd::87:7400/120	2001:db8:abcd::87:74ff
118	2001:db8:abcd::87:7500/120	2001:db8:abcd::87:75ff
119	2001:db8:abcd::87:7600/120	2001:db8:abcd::87:76ff
120	2001:db8:abcd::87:7700/120	2001:db8:abcd::87:77ff
121	2001:db8:abcd::87:7800/120	2001:db8:abcd::87:78ff
122	2001:db8:abcd::87:7900/120	2001:db8:abcd::87:79ff
123	2001:db8:abcd::87:7a00/120	2001:db8:abcd::87:7aff
124	2001:db8:abcd::87:7b00/120	2001:db8:abcd::87:7bff
125	2001:db8:abcd::87:7c00/120	2001:db8:abcd::87:7cff
126	2001:db8:abcd::87:7d00/120	2001:db8:abcd::87:7dff
127	2001:db8:abcd::87:7e00/120	2001:db8:abcd::87:7eff
128	2001:db8:abcd::87:7f00/120	2001:db8:abcd::87:7fff
129	2001:db8:abcd::87:8000/120	2001:db8:abcd::87:80ff
130	2001:db8:abcd::87:8100/120	2001:db8:abcd::87:81ff
131	2001:db8:abcd::87:8200/120	2001:db8:abcd::87:82ff
132	2001:db8:abcd::87:8300/120	2001:db8:abcd::87:83ff
133	2001:db8:abcd::87:8400/120	2001:db8:abcd::87:84ff
134	2001:db8:abcd::87:8500/120	2001:db8:abcd::87:85ff
135	2001:db8:abcd::87:8600/120	2001:db8:abcd::87:86ff
136	2001:db8:abcd::87:8700/120	2001:db8:abcd::87:87ff
137	2001:db8:abcd::87:8800/120	2001:db8:abcd::87:88ff
138	2001:db8:abcd::87:8900/120	2001:db8:abcd::87:89ff
139	2001:db8:abcd::87:8a00/120	2001:db8:abcd::87:8aff
140	2001:db8:abcd::87:8b00/120	2001:db8:abcd::87:8bff
141	2001:db8:abcd::87:8c00/120	2001:db8:abcd::87:8cff
142	2001:db8:abcd::87:8d00/120	2001:db8:abcd::87:8dff
143	2001:db8:abcd::87:8e00/120	2001:db8:abcd::87:8eff
144	2001:db8:abcd::87:8f00/120	2001:db8:abcd::87:8fff
145	2001:db8:abcd::87:9000/120	2001:db8:abcd::87:90ff
146	2001:db8:abcd::87:9100/120	2001:db8:abcd::87:91ff
147	2001:db8:abcd::87:9200/120	2001:db8:abcd::87:92ff
148	2001:db8:abcd::87:9300/120	2001:db8:abcd::87:93ff
149	2001:db8:abcd::87:9400/120	2001:db8:abcd::87:94ff
150	2001:db8:abcd::87:9500/120	2001:db8:abcd::87:95ff
151	2001:db8:abcd::87:9600/120	2001:db8:abcd::87:96ff
152	2001:db8:abcd::87:9700/120	2001:db8:abcd::87:97ff
153	2001:db8:abcd::87:9800/120	2001:db8:abcd::87:98ff
154	2001:db8:abcd::87:9900/120	2001:db8:abcd::87:99ff
155	2001:db8:abcd::87:9a00/120	2001:db8:abcd::87:9aff
156	2001:db8:abcd::87:9b00/120	2001:db8:abcd::87:9bff
157	2001:db8:abcd::87:9c00/120	2001:db8:abcd::87:9cff
158	2001:db8:abcd::87:9d00/120	2001:db8:abcd::87:9dff
159	2001:db8:abcd::87:9e00/120	2001:db8:abcd::87:9eff
160	2001:db8:abcd::87:9f00/120	2001:db8:abcd::87:9fff
161	2001:db8:abcd::87:a000/120	2001:db8:abcd::87:a0ff
162	2001:db8:abcd::87:a100/120	2001:db8:abcd::87:a1ff
163	2001:db8:abcd::87:a200/120	2001:db8:abcd::87:a2ff
164	2001:db8:abcd::87:a300/120	2001:db8:abcd::87:a3ff
165	2001:db8:abcd::87:a400/120	2001:db8:abcd::87:a4ff
166	2001:db8:abcd::87:a500/120	2001:db8:abcd::87:a5ff
167	2001:db8:abcd::87:a600/120	2001:db8:abcd::87:a6ff
168	2001:db8:abcd::87:a700/120	2001:db8:abcd::87:a7ff
169	2001:db8:abcd::87:a800/120	2001:db8:abcd::87:a8ff
170	2001:db8:abcd::87:a900/120	2001:db8:abcd::87:a9ff
171	2001:db8:abcd::87:aa00/120	2001:db8:abcd::87:aaff
172	2001:db8:abcd::87:ab00/120	2001:db8:abcd::87:abff
173	2001:db8:abcd::87:ac00/120	2001:db8:abcd::87:acff
174	2001:db8:abcd::87:ad00/120	2001:db8:abcd::87:adff
175	2001:db8:abcd::87:ae00/120	2001:db8:abcd::87:aeff
176	2001:db8:abcd::87:af00/120	2001:db8:abcd::87:afff
177	2001:db8:abcd::87:b000/120	2001:db8:abcd::87:b0ff
178	2001:db8:abcd::87:b100/120	2001:db8:abcd::87:b1ff
179	2001:db8:abcd::87:b200/120	2001:db8:abcd::87:b2ff
180	2001:db8:abcd::87:b300/120	2001:db8:abcd::87:b3ff
181	2001:db8:abcd::87:b400/120	2001:db8:abcd::87:b4ff
182	2001:db8:abcd::87:b500/120	2001:db8:abcd::87:b5ff
183	2001:db8:abcd::87:b600/120	2001:db8:abcd::87:b6ff
184	2001:db8:abcd::87:b700/120	2001:db8:abcd::87:b7ff
185	2001:db8:abcd::87:b800/120	2001:db8:abcd::87:b8ff
186	2001:db8:abcd::87:b900/120	2001:db8:abcd::87:b9ff
187	2001:db8:abcd::87:ba00/120	2001:db8:abcd::87:baff
188	2001:db8:abcd::87:bb00/120	2001:db8:abcd::87:bbff
189	2001:db8:abcd::87:bc00/120	2001:db8:abcd::87:bcff
190	2001:db8:abcd::87:bd00/120	2001:db8:abcd::87:bdff
191	2001:db8:abcd::87:be00/120	2001:db8:abcd::87:beff
192	2001:db8:abcd::87:bf00/120	2001:db8:abcd::87:bfff
193	2001:db8:abcd::87:c000/120	2001:db8:abcd::87:c0ff
194	2001:db8:abcd::87:c100/120	2001:db8:abcd::87:c1ff
195	2001:db8:abcd::87:c200/120	2001:db8:abcd::87:c2ff
196	2001:db8:abcd::87:c300/120	2001:db8:abcd::87:c3ff
197	2001:db8:abcd::87:c400/120	2001:db8:abcd::87:c4ff
198	2001:db8:abcd::87:c500/120	2001:db8:abcd::87:c5ff
199	2001:db8:abcd::87:c600/120	2001:db8:abcd::87:c6ff
200	2001:db8:abcd::87:c700/120	2001:db8:abcd::87:c7ff
201	2001:db8:abcd::87:c800/120	2001:db8:abcd::87:c8ff
202	2001:db8:abcd::87:c900/120	2001:db8:abcd::87:c9ff
203	2001:db8:abcd::87:ca00/120	2001:db8:abcd::87:caff
204	2001:db8:abcd::87:cb00/120	2001:db8:abcd::87:cbff
205	2001:db8:abcd::87:cc00/120	2001:db8:abcd::87:ccff
206	2001:db8:abcd::87:cd00/120	2001:db8:abcd::87:cdff
207	2001:db8:abcd::87:ce00/120	2001:db8:abcd::87:ceff
208	2001:db8:abcd::87:cf00/120	2001:db8:abcd::87:cfff
209	2001:db8:abcd::87:d000/120	2001:db8:abcd::87:d0ff
210	2001:db8:abcd::87:d100/120	2001:db8:abcd::87:d1ff
211	2001:db8:abcd::87:d200/120	2001:db8:abcd::87:d2ff
212	2001:db8:abcd::87:d300/120	2001:db8:abcd::87:d3ff
213	2001:db8:abcd::87:d400/120	2001:db8:abcd::87:d4ff
214	2001:db8:abcd::87:d500/120	2001:db8:abcd::87:d5ff
215	2001:db8:abcd::87:d600/120	2001:db8:abcd::87:d6ff
216	2001:db8:abcd::87:d700/120	2001:db8:abcd::87:d7ff
217	2001:db8:abcd::87:d800/120	2001:db8:abcd::87:d8ff
218	2001:db8:abcd::87:d900/120	2001:db8:abcd::87:d9ff
219	2001:db8:abcd::87:da00/120	2001:db8:abcd::87:daff
220	2001:db8:abcd::87:db00/120	2001:db8:abcd::87:dbff
221	2001:db8:abcd::87:dc00/120	2001:db8:abcd::87:dcff
222	2001:db8:abcd::87:dd00/120	2001:db8:abcd::87:ddff
223	2001:db8:abcd::87:de00/120	2001:db8:abcd::87:deff
224	2001:db8:abcd::87:df00/120	2001:db8:abcd::87:dfff
225	2001:db8:abcd::87:e000/120	2001:db8:abcd::87:e0ff
226	2001:db8:abcd::87:e100/120	2001:db8:abcd::87:e1ff
227	2001:db8:abcd::87:e200/120	2001:db8:abcd::87:e2ff
228	2001:db8:abcd::87:e300/120	2001:db8:abcd::87:e3ff
229	2001:db8:abcd::87:e400/120	2001:db8:abcd::87:e4ff
230	2001:db8:abcd::87:e500/120	2001:db8:abcd::87:e5ff
231	2001:db8:abcd::87:e600/120	2001:db8:abcd::87:e6ff
232	2001:db8:abcd::87:e700/120	2001:db8:abcd::87:e7ff
233	2001:db8:abcd::87:e800/120	2001:db8:abcd::87:e8ff
234	2001:db8:abcd::87:e900/120	2001:db8:abcd::87:e9ff
235	2001:db8:abcd::87:ea00/120	2001:db8:abcd::87:eaff
236	2001:db8:abcd::87:eb00/120	2001:db8:abcd::87:ebff
237	2001:db8:abcd::87:ec00/120	2001:db8:abcd::87:ecff
238	2001:db8:abcd::87:ed00/120	2001:db8:abcd::87:edff
239	2001:db8:abcd::87:ee00/120	2001:db8:abcd::87:eeff
240	2001:db8:abcd::87:ef00/120	2001:db8:abcd::87:efff
241	2001:db8:abcd::87:f000/120	2001:db8:abcd::87:f0ff
242	2001:db8:abcd::87:f100/120	2001:db8:abcd::87:f1ff
243	2001:db8:abcd::87:f200/120	2001:db8:abcd::87:f2ff
244	2001:db8:abcd::87:f300/120	2001:db8:abcd::87:f3ff
245	2001:db8:abcd::87:f400/120	2001:db8:abcd::87:f4ff
246	2001:db8:abcd::87:f500/120	2001:db8:abcd::87:f5ff
247	2001:db8:abcd::87:f600/120	2001:db8:abcd::87:f6ff
248	2001:db8:abcd::87:f700/120	2001:db8:abcd::87:f7ff
249	2001:db8:abcd::87:f800/120	2001:db8:abcd::87:f8ff
250	2001:db8:abcd::87:f900/120	2001:db8:abcd::87:f9ff
251	2001:db8:abcd::87:fa00/120	2001:db8:abcd::87:faff
252	2001:db8:abcd::87:fb00/120	2001:db8:abcd::87:fbff
253	2001:db8:abcd::87:fc00/120	2001:db8:abcd::87:fcff
254	2001:db8:abcd::87:fd00/120	2001:db8:abcd::87:fdff
255	2001:db8:abcd::87:fe00/120	2001:db8:abcd::87:feff
256	2001:db8:abcd::87:ff00/120	2001:db8:abcd::87:ffff

01 / table

IPv6 prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	addresses	/64 subnets	in your /112
/8	2¹²⁰	2⁵⁶	-
/12	2¹¹⁶	2⁵²	-
/16	2¹¹²	2⁴⁸	-
/20	2¹⁰⁸	2⁴⁴	-
/24	2¹⁰⁴	2⁴⁰	-
/28	2¹⁰⁰	2³⁶	-
/32	2⁹⁶	4,294,967,296	-
/36	2⁹²	268,435,456	-
/40	2⁸⁸	16,777,216	-
/44	2⁸⁴	1,048,576	-
/48	2⁸⁰	65,536	-
/52	2⁷⁶	4,096	-
/56	2⁷²	256	-
/60	2⁶⁸	16	-
/64	2⁶⁴	1	-
/72	2⁵⁶	-	-
/80	2⁴⁸	-	-
/96	4,294,967,296	-	-
/112	65,536	-	1
/120	256	-	256 split →
/124	16	-	4,096 split →
/126	4	-	16,384 split →
/127	2	-	32,768 split →
/128	1	-	65,536 split →

02 / faq

About this calculator.

How do I use this IPv6 calculator?

▼

Type an IPv6 address followed by a prefix, like 2001:db8:abcd::1/48. Without a prefix it uses /64. The address can be written in full or shortened with ::.

Why does IPv6 have no broadcast address?

▼

IPv6 replaced broadcast with multicast, so no address is set aside for it. That is why this calculator shows the whole range, from the network address to the last address.

What prefix do ISPs usually hand out?

▼

A single LAN is almost always a /64. Home customers usually get a /56 or /60, and an organization or site usually gets a /48. One /48 holds 65,536 /64 subnets.

Learn how to work it out →