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)10.0.247.0/24

network10.0.247.0/24

broadcast10.0.247.255

first host10.0.247.1

last host10.0.247.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.247.0/24

address00001010.00000000.11110111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11110111.00000000

broadcast00001010.00000000.11110111.11111111

green = network part, grey = host part

hex0x0a00f700

decimal167835392

reverse dns0.247.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:f700

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.247.0/32	10.0.247.0 – 10.0.247.0	10.0.247.0
2	10.0.247.1/32	10.0.247.1 – 10.0.247.1	10.0.247.1
3	10.0.247.2/32	10.0.247.2 – 10.0.247.2	10.0.247.2
4	10.0.247.3/32	10.0.247.3 – 10.0.247.3	10.0.247.3
5	10.0.247.4/32	10.0.247.4 – 10.0.247.4	10.0.247.4
6	10.0.247.5/32	10.0.247.5 – 10.0.247.5	10.0.247.5
7	10.0.247.6/32	10.0.247.6 – 10.0.247.6	10.0.247.6
8	10.0.247.7/32	10.0.247.7 – 10.0.247.7	10.0.247.7
9	10.0.247.8/32	10.0.247.8 – 10.0.247.8	10.0.247.8
10	10.0.247.9/32	10.0.247.9 – 10.0.247.9	10.0.247.9
11	10.0.247.10/32	10.0.247.10 – 10.0.247.10	10.0.247.10
12	10.0.247.11/32	10.0.247.11 – 10.0.247.11	10.0.247.11
13	10.0.247.12/32	10.0.247.12 – 10.0.247.12	10.0.247.12
14	10.0.247.13/32	10.0.247.13 – 10.0.247.13	10.0.247.13
15	10.0.247.14/32	10.0.247.14 – 10.0.247.14	10.0.247.14
16	10.0.247.15/32	10.0.247.15 – 10.0.247.15	10.0.247.15
17	10.0.247.16/32	10.0.247.16 – 10.0.247.16	10.0.247.16
18	10.0.247.17/32	10.0.247.17 – 10.0.247.17	10.0.247.17
19	10.0.247.18/32	10.0.247.18 – 10.0.247.18	10.0.247.18
20	10.0.247.19/32	10.0.247.19 – 10.0.247.19	10.0.247.19
21	10.0.247.20/32	10.0.247.20 – 10.0.247.20	10.0.247.20
22	10.0.247.21/32	10.0.247.21 – 10.0.247.21	10.0.247.21
23	10.0.247.22/32	10.0.247.22 – 10.0.247.22	10.0.247.22
24	10.0.247.23/32	10.0.247.23 – 10.0.247.23	10.0.247.23
25	10.0.247.24/32	10.0.247.24 – 10.0.247.24	10.0.247.24
26	10.0.247.25/32	10.0.247.25 – 10.0.247.25	10.0.247.25
27	10.0.247.26/32	10.0.247.26 – 10.0.247.26	10.0.247.26
28	10.0.247.27/32	10.0.247.27 – 10.0.247.27	10.0.247.27
29	10.0.247.28/32	10.0.247.28 – 10.0.247.28	10.0.247.28
30	10.0.247.29/32	10.0.247.29 – 10.0.247.29	10.0.247.29
31	10.0.247.30/32	10.0.247.30 – 10.0.247.30	10.0.247.30
32	10.0.247.31/32	10.0.247.31 – 10.0.247.31	10.0.247.31
33	10.0.247.32/32	10.0.247.32 – 10.0.247.32	10.0.247.32
34	10.0.247.33/32	10.0.247.33 – 10.0.247.33	10.0.247.33
35	10.0.247.34/32	10.0.247.34 – 10.0.247.34	10.0.247.34
36	10.0.247.35/32	10.0.247.35 – 10.0.247.35	10.0.247.35
37	10.0.247.36/32	10.0.247.36 – 10.0.247.36	10.0.247.36
38	10.0.247.37/32	10.0.247.37 – 10.0.247.37	10.0.247.37
39	10.0.247.38/32	10.0.247.38 – 10.0.247.38	10.0.247.38
40	10.0.247.39/32	10.0.247.39 – 10.0.247.39	10.0.247.39
41	10.0.247.40/32	10.0.247.40 – 10.0.247.40	10.0.247.40
42	10.0.247.41/32	10.0.247.41 – 10.0.247.41	10.0.247.41
43	10.0.247.42/32	10.0.247.42 – 10.0.247.42	10.0.247.42
44	10.0.247.43/32	10.0.247.43 – 10.0.247.43	10.0.247.43
45	10.0.247.44/32	10.0.247.44 – 10.0.247.44	10.0.247.44
46	10.0.247.45/32	10.0.247.45 – 10.0.247.45	10.0.247.45
47	10.0.247.46/32	10.0.247.46 – 10.0.247.46	10.0.247.46
48	10.0.247.47/32	10.0.247.47 – 10.0.247.47	10.0.247.47
49	10.0.247.48/32	10.0.247.48 – 10.0.247.48	10.0.247.48
50	10.0.247.49/32	10.0.247.49 – 10.0.247.49	10.0.247.49
51	10.0.247.50/32	10.0.247.50 – 10.0.247.50	10.0.247.50
52	10.0.247.51/32	10.0.247.51 – 10.0.247.51	10.0.247.51
53	10.0.247.52/32	10.0.247.52 – 10.0.247.52	10.0.247.52
54	10.0.247.53/32	10.0.247.53 – 10.0.247.53	10.0.247.53
55	10.0.247.54/32	10.0.247.54 – 10.0.247.54	10.0.247.54
56	10.0.247.55/32	10.0.247.55 – 10.0.247.55	10.0.247.55
57	10.0.247.56/32	10.0.247.56 – 10.0.247.56	10.0.247.56
58	10.0.247.57/32	10.0.247.57 – 10.0.247.57	10.0.247.57
59	10.0.247.58/32	10.0.247.58 – 10.0.247.58	10.0.247.58
60	10.0.247.59/32	10.0.247.59 – 10.0.247.59	10.0.247.59
61	10.0.247.60/32	10.0.247.60 – 10.0.247.60	10.0.247.60
62	10.0.247.61/32	10.0.247.61 – 10.0.247.61	10.0.247.61
63	10.0.247.62/32	10.0.247.62 – 10.0.247.62	10.0.247.62
64	10.0.247.63/32	10.0.247.63 – 10.0.247.63	10.0.247.63
65	10.0.247.64/32	10.0.247.64 – 10.0.247.64	10.0.247.64
66	10.0.247.65/32	10.0.247.65 – 10.0.247.65	10.0.247.65
67	10.0.247.66/32	10.0.247.66 – 10.0.247.66	10.0.247.66
68	10.0.247.67/32	10.0.247.67 – 10.0.247.67	10.0.247.67
69	10.0.247.68/32	10.0.247.68 – 10.0.247.68	10.0.247.68
70	10.0.247.69/32	10.0.247.69 – 10.0.247.69	10.0.247.69
71	10.0.247.70/32	10.0.247.70 – 10.0.247.70	10.0.247.70
72	10.0.247.71/32	10.0.247.71 – 10.0.247.71	10.0.247.71
73	10.0.247.72/32	10.0.247.72 – 10.0.247.72	10.0.247.72
74	10.0.247.73/32	10.0.247.73 – 10.0.247.73	10.0.247.73
75	10.0.247.74/32	10.0.247.74 – 10.0.247.74	10.0.247.74
76	10.0.247.75/32	10.0.247.75 – 10.0.247.75	10.0.247.75
77	10.0.247.76/32	10.0.247.76 – 10.0.247.76	10.0.247.76
78	10.0.247.77/32	10.0.247.77 – 10.0.247.77	10.0.247.77
79	10.0.247.78/32	10.0.247.78 – 10.0.247.78	10.0.247.78
80	10.0.247.79/32	10.0.247.79 – 10.0.247.79	10.0.247.79
81	10.0.247.80/32	10.0.247.80 – 10.0.247.80	10.0.247.80
82	10.0.247.81/32	10.0.247.81 – 10.0.247.81	10.0.247.81
83	10.0.247.82/32	10.0.247.82 – 10.0.247.82	10.0.247.82
84	10.0.247.83/32	10.0.247.83 – 10.0.247.83	10.0.247.83
85	10.0.247.84/32	10.0.247.84 – 10.0.247.84	10.0.247.84
86	10.0.247.85/32	10.0.247.85 – 10.0.247.85	10.0.247.85
87	10.0.247.86/32	10.0.247.86 – 10.0.247.86	10.0.247.86
88	10.0.247.87/32	10.0.247.87 – 10.0.247.87	10.0.247.87
89	10.0.247.88/32	10.0.247.88 – 10.0.247.88	10.0.247.88
90	10.0.247.89/32	10.0.247.89 – 10.0.247.89	10.0.247.89
91	10.0.247.90/32	10.0.247.90 – 10.0.247.90	10.0.247.90
92	10.0.247.91/32	10.0.247.91 – 10.0.247.91	10.0.247.91
93	10.0.247.92/32	10.0.247.92 – 10.0.247.92	10.0.247.92
94	10.0.247.93/32	10.0.247.93 – 10.0.247.93	10.0.247.93
95	10.0.247.94/32	10.0.247.94 – 10.0.247.94	10.0.247.94
96	10.0.247.95/32	10.0.247.95 – 10.0.247.95	10.0.247.95
97	10.0.247.96/32	10.0.247.96 – 10.0.247.96	10.0.247.96
98	10.0.247.97/32	10.0.247.97 – 10.0.247.97	10.0.247.97
99	10.0.247.98/32	10.0.247.98 – 10.0.247.98	10.0.247.98
100	10.0.247.99/32	10.0.247.99 – 10.0.247.99	10.0.247.99
101	10.0.247.100/32	10.0.247.100 – 10.0.247.100	10.0.247.100
102	10.0.247.101/32	10.0.247.101 – 10.0.247.101	10.0.247.101
103	10.0.247.102/32	10.0.247.102 – 10.0.247.102	10.0.247.102
104	10.0.247.103/32	10.0.247.103 – 10.0.247.103	10.0.247.103
105	10.0.247.104/32	10.0.247.104 – 10.0.247.104	10.0.247.104
106	10.0.247.105/32	10.0.247.105 – 10.0.247.105	10.0.247.105
107	10.0.247.106/32	10.0.247.106 – 10.0.247.106	10.0.247.106
108	10.0.247.107/32	10.0.247.107 – 10.0.247.107	10.0.247.107
109	10.0.247.108/32	10.0.247.108 – 10.0.247.108	10.0.247.108
110	10.0.247.109/32	10.0.247.109 – 10.0.247.109	10.0.247.109
111	10.0.247.110/32	10.0.247.110 – 10.0.247.110	10.0.247.110
112	10.0.247.111/32	10.0.247.111 – 10.0.247.111	10.0.247.111
113	10.0.247.112/32	10.0.247.112 – 10.0.247.112	10.0.247.112
114	10.0.247.113/32	10.0.247.113 – 10.0.247.113	10.0.247.113
115	10.0.247.114/32	10.0.247.114 – 10.0.247.114	10.0.247.114
116	10.0.247.115/32	10.0.247.115 – 10.0.247.115	10.0.247.115
117	10.0.247.116/32	10.0.247.116 – 10.0.247.116	10.0.247.116
118	10.0.247.117/32	10.0.247.117 – 10.0.247.117	10.0.247.117
119	10.0.247.118/32	10.0.247.118 – 10.0.247.118	10.0.247.118
120	10.0.247.119/32	10.0.247.119 – 10.0.247.119	10.0.247.119
121	10.0.247.120/32	10.0.247.120 – 10.0.247.120	10.0.247.120
122	10.0.247.121/32	10.0.247.121 – 10.0.247.121	10.0.247.121
123	10.0.247.122/32	10.0.247.122 – 10.0.247.122	10.0.247.122
124	10.0.247.123/32	10.0.247.123 – 10.0.247.123	10.0.247.123
125	10.0.247.124/32	10.0.247.124 – 10.0.247.124	10.0.247.124
126	10.0.247.125/32	10.0.247.125 – 10.0.247.125	10.0.247.125
127	10.0.247.126/32	10.0.247.126 – 10.0.247.126	10.0.247.126
128	10.0.247.127/32	10.0.247.127 – 10.0.247.127	10.0.247.127
129	10.0.247.128/32	10.0.247.128 – 10.0.247.128	10.0.247.128
130	10.0.247.129/32	10.0.247.129 – 10.0.247.129	10.0.247.129
131	10.0.247.130/32	10.0.247.130 – 10.0.247.130	10.0.247.130
132	10.0.247.131/32	10.0.247.131 – 10.0.247.131	10.0.247.131
133	10.0.247.132/32	10.0.247.132 – 10.0.247.132	10.0.247.132
134	10.0.247.133/32	10.0.247.133 – 10.0.247.133	10.0.247.133
135	10.0.247.134/32	10.0.247.134 – 10.0.247.134	10.0.247.134
136	10.0.247.135/32	10.0.247.135 – 10.0.247.135	10.0.247.135
137	10.0.247.136/32	10.0.247.136 – 10.0.247.136	10.0.247.136
138	10.0.247.137/32	10.0.247.137 – 10.0.247.137	10.0.247.137
139	10.0.247.138/32	10.0.247.138 – 10.0.247.138	10.0.247.138
140	10.0.247.139/32	10.0.247.139 – 10.0.247.139	10.0.247.139
141	10.0.247.140/32	10.0.247.140 – 10.0.247.140	10.0.247.140
142	10.0.247.141/32	10.0.247.141 – 10.0.247.141	10.0.247.141
143	10.0.247.142/32	10.0.247.142 – 10.0.247.142	10.0.247.142
144	10.0.247.143/32	10.0.247.143 – 10.0.247.143	10.0.247.143
145	10.0.247.144/32	10.0.247.144 – 10.0.247.144	10.0.247.144
146	10.0.247.145/32	10.0.247.145 – 10.0.247.145	10.0.247.145
147	10.0.247.146/32	10.0.247.146 – 10.0.247.146	10.0.247.146
148	10.0.247.147/32	10.0.247.147 – 10.0.247.147	10.0.247.147
149	10.0.247.148/32	10.0.247.148 – 10.0.247.148	10.0.247.148
150	10.0.247.149/32	10.0.247.149 – 10.0.247.149	10.0.247.149
151	10.0.247.150/32	10.0.247.150 – 10.0.247.150	10.0.247.150
152	10.0.247.151/32	10.0.247.151 – 10.0.247.151	10.0.247.151
153	10.0.247.152/32	10.0.247.152 – 10.0.247.152	10.0.247.152
154	10.0.247.153/32	10.0.247.153 – 10.0.247.153	10.0.247.153
155	10.0.247.154/32	10.0.247.154 – 10.0.247.154	10.0.247.154
156	10.0.247.155/32	10.0.247.155 – 10.0.247.155	10.0.247.155
157	10.0.247.156/32	10.0.247.156 – 10.0.247.156	10.0.247.156
158	10.0.247.157/32	10.0.247.157 – 10.0.247.157	10.0.247.157
159	10.0.247.158/32	10.0.247.158 – 10.0.247.158	10.0.247.158
160	10.0.247.159/32	10.0.247.159 – 10.0.247.159	10.0.247.159
161	10.0.247.160/32	10.0.247.160 – 10.0.247.160	10.0.247.160
162	10.0.247.161/32	10.0.247.161 – 10.0.247.161	10.0.247.161
163	10.0.247.162/32	10.0.247.162 – 10.0.247.162	10.0.247.162
164	10.0.247.163/32	10.0.247.163 – 10.0.247.163	10.0.247.163
165	10.0.247.164/32	10.0.247.164 – 10.0.247.164	10.0.247.164
166	10.0.247.165/32	10.0.247.165 – 10.0.247.165	10.0.247.165
167	10.0.247.166/32	10.0.247.166 – 10.0.247.166	10.0.247.166
168	10.0.247.167/32	10.0.247.167 – 10.0.247.167	10.0.247.167
169	10.0.247.168/32	10.0.247.168 – 10.0.247.168	10.0.247.168
170	10.0.247.169/32	10.0.247.169 – 10.0.247.169	10.0.247.169
171	10.0.247.170/32	10.0.247.170 – 10.0.247.170	10.0.247.170
172	10.0.247.171/32	10.0.247.171 – 10.0.247.171	10.0.247.171
173	10.0.247.172/32	10.0.247.172 – 10.0.247.172	10.0.247.172
174	10.0.247.173/32	10.0.247.173 – 10.0.247.173	10.0.247.173
175	10.0.247.174/32	10.0.247.174 – 10.0.247.174	10.0.247.174
176	10.0.247.175/32	10.0.247.175 – 10.0.247.175	10.0.247.175
177	10.0.247.176/32	10.0.247.176 – 10.0.247.176	10.0.247.176
178	10.0.247.177/32	10.0.247.177 – 10.0.247.177	10.0.247.177
179	10.0.247.178/32	10.0.247.178 – 10.0.247.178	10.0.247.178
180	10.0.247.179/32	10.0.247.179 – 10.0.247.179	10.0.247.179
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198	10.0.247.197/32	10.0.247.197 – 10.0.247.197	10.0.247.197
199	10.0.247.198/32	10.0.247.198 – 10.0.247.198	10.0.247.198
200	10.0.247.199/32	10.0.247.199 – 10.0.247.199	10.0.247.199
201	10.0.247.200/32	10.0.247.200 – 10.0.247.200	10.0.247.200
202	10.0.247.201/32	10.0.247.201 – 10.0.247.201	10.0.247.201
203	10.0.247.202/32	10.0.247.202 – 10.0.247.202	10.0.247.202
204	10.0.247.203/32	10.0.247.203 – 10.0.247.203	10.0.247.203
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207	10.0.247.206/32	10.0.247.206 – 10.0.247.206	10.0.247.206
208	10.0.247.207/32	10.0.247.207 – 10.0.247.207	10.0.247.207
209	10.0.247.208/32	10.0.247.208 – 10.0.247.208	10.0.247.208
210	10.0.247.209/32	10.0.247.209 – 10.0.247.209	10.0.247.209
211	10.0.247.210/32	10.0.247.210 – 10.0.247.210	10.0.247.210
212	10.0.247.211/32	10.0.247.211 – 10.0.247.211	10.0.247.211
213	10.0.247.212/32	10.0.247.212 – 10.0.247.212	10.0.247.212
214	10.0.247.213/32	10.0.247.213 – 10.0.247.213	10.0.247.213
215	10.0.247.214/32	10.0.247.214 – 10.0.247.214	10.0.247.214
216	10.0.247.215/32	10.0.247.215 – 10.0.247.215	10.0.247.215
217	10.0.247.216/32	10.0.247.216 – 10.0.247.216	10.0.247.216
218	10.0.247.217/32	10.0.247.217 – 10.0.247.217	10.0.247.217
219	10.0.247.218/32	10.0.247.218 – 10.0.247.218	10.0.247.218
220	10.0.247.219/32	10.0.247.219 – 10.0.247.219	10.0.247.219
221	10.0.247.220/32	10.0.247.220 – 10.0.247.220	10.0.247.220
222	10.0.247.221/32	10.0.247.221 – 10.0.247.221	10.0.247.221
223	10.0.247.222/32	10.0.247.222 – 10.0.247.222	10.0.247.222
224	10.0.247.223/32	10.0.247.223 – 10.0.247.223	10.0.247.223
225	10.0.247.224/32	10.0.247.224 – 10.0.247.224	10.0.247.224
226	10.0.247.225/32	10.0.247.225 – 10.0.247.225	10.0.247.225
227	10.0.247.226/32	10.0.247.226 – 10.0.247.226	10.0.247.226
228	10.0.247.227/32	10.0.247.227 – 10.0.247.227	10.0.247.227
229	10.0.247.228/32	10.0.247.228 – 10.0.247.228	10.0.247.228
230	10.0.247.229/32	10.0.247.229 – 10.0.247.229	10.0.247.229
231	10.0.247.230/32	10.0.247.230 – 10.0.247.230	10.0.247.230
232	10.0.247.231/32	10.0.247.231 – 10.0.247.231	10.0.247.231
233	10.0.247.232/32	10.0.247.232 – 10.0.247.232	10.0.247.232
234	10.0.247.233/32	10.0.247.233 – 10.0.247.233	10.0.247.233
235	10.0.247.234/32	10.0.247.234 – 10.0.247.234	10.0.247.234
236	10.0.247.235/32	10.0.247.235 – 10.0.247.235	10.0.247.235
237	10.0.247.236/32	10.0.247.236 – 10.0.247.236	10.0.247.236
238	10.0.247.237/32	10.0.247.237 – 10.0.247.237	10.0.247.237
239	10.0.247.238/32	10.0.247.238 – 10.0.247.238	10.0.247.238
240	10.0.247.239/32	10.0.247.239 – 10.0.247.239	10.0.247.239
241	10.0.247.240/32	10.0.247.240 – 10.0.247.240	10.0.247.240
242	10.0.247.241/32	10.0.247.241 – 10.0.247.241	10.0.247.241
243	10.0.247.242/32	10.0.247.242 – 10.0.247.242	10.0.247.242
244	10.0.247.243/32	10.0.247.243 – 10.0.247.243	10.0.247.243
245	10.0.247.244/32	10.0.247.244 – 10.0.247.244	10.0.247.244
246	10.0.247.245/32	10.0.247.245 – 10.0.247.245	10.0.247.245
247	10.0.247.246/32	10.0.247.246 – 10.0.247.246	10.0.247.246
248	10.0.247.247/32	10.0.247.247 – 10.0.247.247	10.0.247.247
249	10.0.247.248/32	10.0.247.248 – 10.0.247.248	10.0.247.248
250	10.0.247.249/32	10.0.247.249 – 10.0.247.249	10.0.247.249
251	10.0.247.250/32	10.0.247.250 – 10.0.247.250	10.0.247.250
252	10.0.247.251/32	10.0.247.251 – 10.0.247.251	10.0.247.251
253	10.0.247.252/32	10.0.247.252 – 10.0.247.252	10.0.247.252
254	10.0.247.253/32	10.0.247.253 – 10.0.247.253	10.0.247.253
255	10.0.247.254/32	10.0.247.254 – 10.0.247.254	10.0.247.254
256	10.0.247.255/32	10.0.247.255 – 10.0.247.255	10.0.247.255

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 →