IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.2.51.0/24

network10.2.51.0/24

broadcast10.2.51.255

first host10.2.51.1

last host10.2.51.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.51.0/24

address00001010.00000010.00110011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.00110011.00000000

broadcast00001010.00000010.00110011.11111111

green = network part, grey = host part

hex0x0a023300

decimal167916288

reverse dns0.51.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3300

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.51.0/32	10.2.51.0 – 10.2.51.0	10.2.51.0
2	10.2.51.1/32	10.2.51.1 – 10.2.51.1	10.2.51.1
3	10.2.51.2/32	10.2.51.2 – 10.2.51.2	10.2.51.2
4	10.2.51.3/32	10.2.51.3 – 10.2.51.3	10.2.51.3
5	10.2.51.4/32	10.2.51.4 – 10.2.51.4	10.2.51.4
6	10.2.51.5/32	10.2.51.5 – 10.2.51.5	10.2.51.5
7	10.2.51.6/32	10.2.51.6 – 10.2.51.6	10.2.51.6
8	10.2.51.7/32	10.2.51.7 – 10.2.51.7	10.2.51.7
9	10.2.51.8/32	10.2.51.8 – 10.2.51.8	10.2.51.8
10	10.2.51.9/32	10.2.51.9 – 10.2.51.9	10.2.51.9
11	10.2.51.10/32	10.2.51.10 – 10.2.51.10	10.2.51.10
12	10.2.51.11/32	10.2.51.11 – 10.2.51.11	10.2.51.11
13	10.2.51.12/32	10.2.51.12 – 10.2.51.12	10.2.51.12
14	10.2.51.13/32	10.2.51.13 – 10.2.51.13	10.2.51.13
15	10.2.51.14/32	10.2.51.14 – 10.2.51.14	10.2.51.14
16	10.2.51.15/32	10.2.51.15 – 10.2.51.15	10.2.51.15
17	10.2.51.16/32	10.2.51.16 – 10.2.51.16	10.2.51.16
18	10.2.51.17/32	10.2.51.17 – 10.2.51.17	10.2.51.17
19	10.2.51.18/32	10.2.51.18 – 10.2.51.18	10.2.51.18
20	10.2.51.19/32	10.2.51.19 – 10.2.51.19	10.2.51.19
21	10.2.51.20/32	10.2.51.20 – 10.2.51.20	10.2.51.20
22	10.2.51.21/32	10.2.51.21 – 10.2.51.21	10.2.51.21
23	10.2.51.22/32	10.2.51.22 – 10.2.51.22	10.2.51.22
24	10.2.51.23/32	10.2.51.23 – 10.2.51.23	10.2.51.23
25	10.2.51.24/32	10.2.51.24 – 10.2.51.24	10.2.51.24
26	10.2.51.25/32	10.2.51.25 – 10.2.51.25	10.2.51.25
27	10.2.51.26/32	10.2.51.26 – 10.2.51.26	10.2.51.26
28	10.2.51.27/32	10.2.51.27 – 10.2.51.27	10.2.51.27
29	10.2.51.28/32	10.2.51.28 – 10.2.51.28	10.2.51.28
30	10.2.51.29/32	10.2.51.29 – 10.2.51.29	10.2.51.29
31	10.2.51.30/32	10.2.51.30 – 10.2.51.30	10.2.51.30
32	10.2.51.31/32	10.2.51.31 – 10.2.51.31	10.2.51.31
33	10.2.51.32/32	10.2.51.32 – 10.2.51.32	10.2.51.32
34	10.2.51.33/32	10.2.51.33 – 10.2.51.33	10.2.51.33
35	10.2.51.34/32	10.2.51.34 – 10.2.51.34	10.2.51.34
36	10.2.51.35/32	10.2.51.35 – 10.2.51.35	10.2.51.35
37	10.2.51.36/32	10.2.51.36 – 10.2.51.36	10.2.51.36
38	10.2.51.37/32	10.2.51.37 – 10.2.51.37	10.2.51.37
39	10.2.51.38/32	10.2.51.38 – 10.2.51.38	10.2.51.38
40	10.2.51.39/32	10.2.51.39 – 10.2.51.39	10.2.51.39
41	10.2.51.40/32	10.2.51.40 – 10.2.51.40	10.2.51.40
42	10.2.51.41/32	10.2.51.41 – 10.2.51.41	10.2.51.41
43	10.2.51.42/32	10.2.51.42 – 10.2.51.42	10.2.51.42
44	10.2.51.43/32	10.2.51.43 – 10.2.51.43	10.2.51.43
45	10.2.51.44/32	10.2.51.44 – 10.2.51.44	10.2.51.44
46	10.2.51.45/32	10.2.51.45 – 10.2.51.45	10.2.51.45
47	10.2.51.46/32	10.2.51.46 – 10.2.51.46	10.2.51.46
48	10.2.51.47/32	10.2.51.47 – 10.2.51.47	10.2.51.47
49	10.2.51.48/32	10.2.51.48 – 10.2.51.48	10.2.51.48
50	10.2.51.49/32	10.2.51.49 – 10.2.51.49	10.2.51.49
51	10.2.51.50/32	10.2.51.50 – 10.2.51.50	10.2.51.50
52	10.2.51.51/32	10.2.51.51 – 10.2.51.51	10.2.51.51
53	10.2.51.52/32	10.2.51.52 – 10.2.51.52	10.2.51.52
54	10.2.51.53/32	10.2.51.53 – 10.2.51.53	10.2.51.53
55	10.2.51.54/32	10.2.51.54 – 10.2.51.54	10.2.51.54
56	10.2.51.55/32	10.2.51.55 – 10.2.51.55	10.2.51.55
57	10.2.51.56/32	10.2.51.56 – 10.2.51.56	10.2.51.56
58	10.2.51.57/32	10.2.51.57 – 10.2.51.57	10.2.51.57
59	10.2.51.58/32	10.2.51.58 – 10.2.51.58	10.2.51.58
60	10.2.51.59/32	10.2.51.59 – 10.2.51.59	10.2.51.59
61	10.2.51.60/32	10.2.51.60 – 10.2.51.60	10.2.51.60
62	10.2.51.61/32	10.2.51.61 – 10.2.51.61	10.2.51.61
63	10.2.51.62/32	10.2.51.62 – 10.2.51.62	10.2.51.62
64	10.2.51.63/32	10.2.51.63 – 10.2.51.63	10.2.51.63
65	10.2.51.64/32	10.2.51.64 – 10.2.51.64	10.2.51.64
66	10.2.51.65/32	10.2.51.65 – 10.2.51.65	10.2.51.65
67	10.2.51.66/32	10.2.51.66 – 10.2.51.66	10.2.51.66
68	10.2.51.67/32	10.2.51.67 – 10.2.51.67	10.2.51.67
69	10.2.51.68/32	10.2.51.68 – 10.2.51.68	10.2.51.68
70	10.2.51.69/32	10.2.51.69 – 10.2.51.69	10.2.51.69
71	10.2.51.70/32	10.2.51.70 – 10.2.51.70	10.2.51.70
72	10.2.51.71/32	10.2.51.71 – 10.2.51.71	10.2.51.71
73	10.2.51.72/32	10.2.51.72 – 10.2.51.72	10.2.51.72
74	10.2.51.73/32	10.2.51.73 – 10.2.51.73	10.2.51.73
75	10.2.51.74/32	10.2.51.74 – 10.2.51.74	10.2.51.74
76	10.2.51.75/32	10.2.51.75 – 10.2.51.75	10.2.51.75
77	10.2.51.76/32	10.2.51.76 – 10.2.51.76	10.2.51.76
78	10.2.51.77/32	10.2.51.77 – 10.2.51.77	10.2.51.77
79	10.2.51.78/32	10.2.51.78 – 10.2.51.78	10.2.51.78
80	10.2.51.79/32	10.2.51.79 – 10.2.51.79	10.2.51.79
81	10.2.51.80/32	10.2.51.80 – 10.2.51.80	10.2.51.80
82	10.2.51.81/32	10.2.51.81 – 10.2.51.81	10.2.51.81
83	10.2.51.82/32	10.2.51.82 – 10.2.51.82	10.2.51.82
84	10.2.51.83/32	10.2.51.83 – 10.2.51.83	10.2.51.83
85	10.2.51.84/32	10.2.51.84 – 10.2.51.84	10.2.51.84
86	10.2.51.85/32	10.2.51.85 – 10.2.51.85	10.2.51.85
87	10.2.51.86/32	10.2.51.86 – 10.2.51.86	10.2.51.86
88	10.2.51.87/32	10.2.51.87 – 10.2.51.87	10.2.51.87
89	10.2.51.88/32	10.2.51.88 – 10.2.51.88	10.2.51.88
90	10.2.51.89/32	10.2.51.89 – 10.2.51.89	10.2.51.89
91	10.2.51.90/32	10.2.51.90 – 10.2.51.90	10.2.51.90
92	10.2.51.91/32	10.2.51.91 – 10.2.51.91	10.2.51.91
93	10.2.51.92/32	10.2.51.92 – 10.2.51.92	10.2.51.92
94	10.2.51.93/32	10.2.51.93 – 10.2.51.93	10.2.51.93
95	10.2.51.94/32	10.2.51.94 – 10.2.51.94	10.2.51.94
96	10.2.51.95/32	10.2.51.95 – 10.2.51.95	10.2.51.95
97	10.2.51.96/32	10.2.51.96 – 10.2.51.96	10.2.51.96
98	10.2.51.97/32	10.2.51.97 – 10.2.51.97	10.2.51.97
99	10.2.51.98/32	10.2.51.98 – 10.2.51.98	10.2.51.98
100	10.2.51.99/32	10.2.51.99 – 10.2.51.99	10.2.51.99
101	10.2.51.100/32	10.2.51.100 – 10.2.51.100	10.2.51.100
102	10.2.51.101/32	10.2.51.101 – 10.2.51.101	10.2.51.101
103	10.2.51.102/32	10.2.51.102 – 10.2.51.102	10.2.51.102
104	10.2.51.103/32	10.2.51.103 – 10.2.51.103	10.2.51.103
105	10.2.51.104/32	10.2.51.104 – 10.2.51.104	10.2.51.104
106	10.2.51.105/32	10.2.51.105 – 10.2.51.105	10.2.51.105
107	10.2.51.106/32	10.2.51.106 – 10.2.51.106	10.2.51.106
108	10.2.51.107/32	10.2.51.107 – 10.2.51.107	10.2.51.107
109	10.2.51.108/32	10.2.51.108 – 10.2.51.108	10.2.51.108
110	10.2.51.109/32	10.2.51.109 – 10.2.51.109	10.2.51.109
111	10.2.51.110/32	10.2.51.110 – 10.2.51.110	10.2.51.110
112	10.2.51.111/32	10.2.51.111 – 10.2.51.111	10.2.51.111
113	10.2.51.112/32	10.2.51.112 – 10.2.51.112	10.2.51.112
114	10.2.51.113/32	10.2.51.113 – 10.2.51.113	10.2.51.113
115	10.2.51.114/32	10.2.51.114 – 10.2.51.114	10.2.51.114
116	10.2.51.115/32	10.2.51.115 – 10.2.51.115	10.2.51.115
117	10.2.51.116/32	10.2.51.116 – 10.2.51.116	10.2.51.116
118	10.2.51.117/32	10.2.51.117 – 10.2.51.117	10.2.51.117
119	10.2.51.118/32	10.2.51.118 – 10.2.51.118	10.2.51.118
120	10.2.51.119/32	10.2.51.119 – 10.2.51.119	10.2.51.119
121	10.2.51.120/32	10.2.51.120 – 10.2.51.120	10.2.51.120
122	10.2.51.121/32	10.2.51.121 – 10.2.51.121	10.2.51.121
123	10.2.51.122/32	10.2.51.122 – 10.2.51.122	10.2.51.122
124	10.2.51.123/32	10.2.51.123 – 10.2.51.123	10.2.51.123
125	10.2.51.124/32	10.2.51.124 – 10.2.51.124	10.2.51.124
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127	10.2.51.126/32	10.2.51.126 – 10.2.51.126	10.2.51.126
128	10.2.51.127/32	10.2.51.127 – 10.2.51.127	10.2.51.127
129	10.2.51.128/32	10.2.51.128 – 10.2.51.128	10.2.51.128
130	10.2.51.129/32	10.2.51.129 – 10.2.51.129	10.2.51.129
131	10.2.51.130/32	10.2.51.130 – 10.2.51.130	10.2.51.130
132	10.2.51.131/32	10.2.51.131 – 10.2.51.131	10.2.51.131
133	10.2.51.132/32	10.2.51.132 – 10.2.51.132	10.2.51.132
134	10.2.51.133/32	10.2.51.133 – 10.2.51.133	10.2.51.133
135	10.2.51.134/32	10.2.51.134 – 10.2.51.134	10.2.51.134
136	10.2.51.135/32	10.2.51.135 – 10.2.51.135	10.2.51.135
137	10.2.51.136/32	10.2.51.136 – 10.2.51.136	10.2.51.136
138	10.2.51.137/32	10.2.51.137 – 10.2.51.137	10.2.51.137
139	10.2.51.138/32	10.2.51.138 – 10.2.51.138	10.2.51.138
140	10.2.51.139/32	10.2.51.139 – 10.2.51.139	10.2.51.139
141	10.2.51.140/32	10.2.51.140 – 10.2.51.140	10.2.51.140
142	10.2.51.141/32	10.2.51.141 – 10.2.51.141	10.2.51.141
143	10.2.51.142/32	10.2.51.142 – 10.2.51.142	10.2.51.142
144	10.2.51.143/32	10.2.51.143 – 10.2.51.143	10.2.51.143
145	10.2.51.144/32	10.2.51.144 – 10.2.51.144	10.2.51.144
146	10.2.51.145/32	10.2.51.145 – 10.2.51.145	10.2.51.145
147	10.2.51.146/32	10.2.51.146 – 10.2.51.146	10.2.51.146
148	10.2.51.147/32	10.2.51.147 – 10.2.51.147	10.2.51.147
149	10.2.51.148/32	10.2.51.148 – 10.2.51.148	10.2.51.148
150	10.2.51.149/32	10.2.51.149 – 10.2.51.149	10.2.51.149
151	10.2.51.150/32	10.2.51.150 – 10.2.51.150	10.2.51.150
152	10.2.51.151/32	10.2.51.151 – 10.2.51.151	10.2.51.151
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156	10.2.51.155/32	10.2.51.155 – 10.2.51.155	10.2.51.155
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210	10.2.51.209/32	10.2.51.209 – 10.2.51.209	10.2.51.209
211	10.2.51.210/32	10.2.51.210 – 10.2.51.210	10.2.51.210
212	10.2.51.211/32	10.2.51.211 – 10.2.51.211	10.2.51.211
213	10.2.51.212/32	10.2.51.212 – 10.2.51.212	10.2.51.212
214	10.2.51.213/32	10.2.51.213 – 10.2.51.213	10.2.51.213
215	10.2.51.214/32	10.2.51.214 – 10.2.51.214	10.2.51.214
216	10.2.51.215/32	10.2.51.215 – 10.2.51.215	10.2.51.215
217	10.2.51.216/32	10.2.51.216 – 10.2.51.216	10.2.51.216
218	10.2.51.217/32	10.2.51.217 – 10.2.51.217	10.2.51.217
219	10.2.51.218/32	10.2.51.218 – 10.2.51.218	10.2.51.218
220	10.2.51.219/32	10.2.51.219 – 10.2.51.219	10.2.51.219
221	10.2.51.220/32	10.2.51.220 – 10.2.51.220	10.2.51.220
222	10.2.51.221/32	10.2.51.221 – 10.2.51.221	10.2.51.221
223	10.2.51.222/32	10.2.51.222 – 10.2.51.222	10.2.51.222
224	10.2.51.223/32	10.2.51.223 – 10.2.51.223	10.2.51.223
225	10.2.51.224/32	10.2.51.224 – 10.2.51.224	10.2.51.224
226	10.2.51.225/32	10.2.51.225 – 10.2.51.225	10.2.51.225
227	10.2.51.226/32	10.2.51.226 – 10.2.51.226	10.2.51.226
228	10.2.51.227/32	10.2.51.227 – 10.2.51.227	10.2.51.227
229	10.2.51.228/32	10.2.51.228 – 10.2.51.228	10.2.51.228
230	10.2.51.229/32	10.2.51.229 – 10.2.51.229	10.2.51.229
231	10.2.51.230/32	10.2.51.230 – 10.2.51.230	10.2.51.230
232	10.2.51.231/32	10.2.51.231 – 10.2.51.231	10.2.51.231
233	10.2.51.232/32	10.2.51.232 – 10.2.51.232	10.2.51.232
234	10.2.51.233/32	10.2.51.233 – 10.2.51.233	10.2.51.233
235	10.2.51.234/32	10.2.51.234 – 10.2.51.234	10.2.51.234
236	10.2.51.235/32	10.2.51.235 – 10.2.51.235	10.2.51.235
237	10.2.51.236/32	10.2.51.236 – 10.2.51.236	10.2.51.236
238	10.2.51.237/32	10.2.51.237 – 10.2.51.237	10.2.51.237
239	10.2.51.238/32	10.2.51.238 – 10.2.51.238	10.2.51.238
240	10.2.51.239/32	10.2.51.239 – 10.2.51.239	10.2.51.239
241	10.2.51.240/32	10.2.51.240 – 10.2.51.240	10.2.51.240
242	10.2.51.241/32	10.2.51.241 – 10.2.51.241	10.2.51.241
243	10.2.51.242/32	10.2.51.242 – 10.2.51.242	10.2.51.242
244	10.2.51.243/32	10.2.51.243 – 10.2.51.243	10.2.51.243
245	10.2.51.244/32	10.2.51.244 – 10.2.51.244	10.2.51.244
246	10.2.51.245/32	10.2.51.245 – 10.2.51.245	10.2.51.245
247	10.2.51.246/32	10.2.51.246 – 10.2.51.246	10.2.51.246
248	10.2.51.247/32	10.2.51.247 – 10.2.51.247	10.2.51.247
249	10.2.51.248/32	10.2.51.248 – 10.2.51.248	10.2.51.248
250	10.2.51.249/32	10.2.51.249 – 10.2.51.249	10.2.51.249
251	10.2.51.250/32	10.2.51.250 – 10.2.51.250	10.2.51.250
252	10.2.51.251/32	10.2.51.251 – 10.2.51.251	10.2.51.251
253	10.2.51.252/32	10.2.51.252 – 10.2.51.252	10.2.51.252
254	10.2.51.253/32	10.2.51.253 – 10.2.51.253	10.2.51.253
255	10.2.51.254/32	10.2.51.254 – 10.2.51.254	10.2.51.254
256	10.2.51.255/32	10.2.51.255 – 10.2.51.255	10.2.51.255

01 / table

IPv4 CIDR prefix table.

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

prefix	subnet mask	addresses	hosts	in your /24
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →