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)10.78.157.0/24

network10.78.157.0/24

broadcast10.78.157.255

first host10.78.157.1

last host10.78.157.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.157.0/24

address00001010.01001110.10011101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.10011101.00000000

broadcast00001010.01001110.10011101.11111111

green = network part, grey = host part

hex0x0a4e9d00

decimal172924160

reverse dns0.157.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:9d00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.157.0/32	10.78.157.0 – 10.78.157.0	10.78.157.0
2	10.78.157.1/32	10.78.157.1 – 10.78.157.1	10.78.157.1
3	10.78.157.2/32	10.78.157.2 – 10.78.157.2	10.78.157.2
4	10.78.157.3/32	10.78.157.3 – 10.78.157.3	10.78.157.3
5	10.78.157.4/32	10.78.157.4 – 10.78.157.4	10.78.157.4
6	10.78.157.5/32	10.78.157.5 – 10.78.157.5	10.78.157.5
7	10.78.157.6/32	10.78.157.6 – 10.78.157.6	10.78.157.6
8	10.78.157.7/32	10.78.157.7 – 10.78.157.7	10.78.157.7
9	10.78.157.8/32	10.78.157.8 – 10.78.157.8	10.78.157.8
10	10.78.157.9/32	10.78.157.9 – 10.78.157.9	10.78.157.9
11	10.78.157.10/32	10.78.157.10 – 10.78.157.10	10.78.157.10
12	10.78.157.11/32	10.78.157.11 – 10.78.157.11	10.78.157.11
13	10.78.157.12/32	10.78.157.12 – 10.78.157.12	10.78.157.12
14	10.78.157.13/32	10.78.157.13 – 10.78.157.13	10.78.157.13
15	10.78.157.14/32	10.78.157.14 – 10.78.157.14	10.78.157.14
16	10.78.157.15/32	10.78.157.15 – 10.78.157.15	10.78.157.15
17	10.78.157.16/32	10.78.157.16 – 10.78.157.16	10.78.157.16
18	10.78.157.17/32	10.78.157.17 – 10.78.157.17	10.78.157.17
19	10.78.157.18/32	10.78.157.18 – 10.78.157.18	10.78.157.18
20	10.78.157.19/32	10.78.157.19 – 10.78.157.19	10.78.157.19
21	10.78.157.20/32	10.78.157.20 – 10.78.157.20	10.78.157.20
22	10.78.157.21/32	10.78.157.21 – 10.78.157.21	10.78.157.21
23	10.78.157.22/32	10.78.157.22 – 10.78.157.22	10.78.157.22
24	10.78.157.23/32	10.78.157.23 – 10.78.157.23	10.78.157.23
25	10.78.157.24/32	10.78.157.24 – 10.78.157.24	10.78.157.24
26	10.78.157.25/32	10.78.157.25 – 10.78.157.25	10.78.157.25
27	10.78.157.26/32	10.78.157.26 – 10.78.157.26	10.78.157.26
28	10.78.157.27/32	10.78.157.27 – 10.78.157.27	10.78.157.27
29	10.78.157.28/32	10.78.157.28 – 10.78.157.28	10.78.157.28
30	10.78.157.29/32	10.78.157.29 – 10.78.157.29	10.78.157.29
31	10.78.157.30/32	10.78.157.30 – 10.78.157.30	10.78.157.30
32	10.78.157.31/32	10.78.157.31 – 10.78.157.31	10.78.157.31
33	10.78.157.32/32	10.78.157.32 – 10.78.157.32	10.78.157.32
34	10.78.157.33/32	10.78.157.33 – 10.78.157.33	10.78.157.33
35	10.78.157.34/32	10.78.157.34 – 10.78.157.34	10.78.157.34
36	10.78.157.35/32	10.78.157.35 – 10.78.157.35	10.78.157.35
37	10.78.157.36/32	10.78.157.36 – 10.78.157.36	10.78.157.36
38	10.78.157.37/32	10.78.157.37 – 10.78.157.37	10.78.157.37
39	10.78.157.38/32	10.78.157.38 – 10.78.157.38	10.78.157.38
40	10.78.157.39/32	10.78.157.39 – 10.78.157.39	10.78.157.39
41	10.78.157.40/32	10.78.157.40 – 10.78.157.40	10.78.157.40
42	10.78.157.41/32	10.78.157.41 – 10.78.157.41	10.78.157.41
43	10.78.157.42/32	10.78.157.42 – 10.78.157.42	10.78.157.42
44	10.78.157.43/32	10.78.157.43 – 10.78.157.43	10.78.157.43
45	10.78.157.44/32	10.78.157.44 – 10.78.157.44	10.78.157.44
46	10.78.157.45/32	10.78.157.45 – 10.78.157.45	10.78.157.45
47	10.78.157.46/32	10.78.157.46 – 10.78.157.46	10.78.157.46
48	10.78.157.47/32	10.78.157.47 – 10.78.157.47	10.78.157.47
49	10.78.157.48/32	10.78.157.48 – 10.78.157.48	10.78.157.48
50	10.78.157.49/32	10.78.157.49 – 10.78.157.49	10.78.157.49
51	10.78.157.50/32	10.78.157.50 – 10.78.157.50	10.78.157.50
52	10.78.157.51/32	10.78.157.51 – 10.78.157.51	10.78.157.51
53	10.78.157.52/32	10.78.157.52 – 10.78.157.52	10.78.157.52
54	10.78.157.53/32	10.78.157.53 – 10.78.157.53	10.78.157.53
55	10.78.157.54/32	10.78.157.54 – 10.78.157.54	10.78.157.54
56	10.78.157.55/32	10.78.157.55 – 10.78.157.55	10.78.157.55
57	10.78.157.56/32	10.78.157.56 – 10.78.157.56	10.78.157.56
58	10.78.157.57/32	10.78.157.57 – 10.78.157.57	10.78.157.57
59	10.78.157.58/32	10.78.157.58 – 10.78.157.58	10.78.157.58
60	10.78.157.59/32	10.78.157.59 – 10.78.157.59	10.78.157.59
61	10.78.157.60/32	10.78.157.60 – 10.78.157.60	10.78.157.60
62	10.78.157.61/32	10.78.157.61 – 10.78.157.61	10.78.157.61
63	10.78.157.62/32	10.78.157.62 – 10.78.157.62	10.78.157.62
64	10.78.157.63/32	10.78.157.63 – 10.78.157.63	10.78.157.63
65	10.78.157.64/32	10.78.157.64 – 10.78.157.64	10.78.157.64
66	10.78.157.65/32	10.78.157.65 – 10.78.157.65	10.78.157.65
67	10.78.157.66/32	10.78.157.66 – 10.78.157.66	10.78.157.66
68	10.78.157.67/32	10.78.157.67 – 10.78.157.67	10.78.157.67
69	10.78.157.68/32	10.78.157.68 – 10.78.157.68	10.78.157.68
70	10.78.157.69/32	10.78.157.69 – 10.78.157.69	10.78.157.69
71	10.78.157.70/32	10.78.157.70 – 10.78.157.70	10.78.157.70
72	10.78.157.71/32	10.78.157.71 – 10.78.157.71	10.78.157.71
73	10.78.157.72/32	10.78.157.72 – 10.78.157.72	10.78.157.72
74	10.78.157.73/32	10.78.157.73 – 10.78.157.73	10.78.157.73
75	10.78.157.74/32	10.78.157.74 – 10.78.157.74	10.78.157.74
76	10.78.157.75/32	10.78.157.75 – 10.78.157.75	10.78.157.75
77	10.78.157.76/32	10.78.157.76 – 10.78.157.76	10.78.157.76
78	10.78.157.77/32	10.78.157.77 – 10.78.157.77	10.78.157.77
79	10.78.157.78/32	10.78.157.78 – 10.78.157.78	10.78.157.78
80	10.78.157.79/32	10.78.157.79 – 10.78.157.79	10.78.157.79
81	10.78.157.80/32	10.78.157.80 – 10.78.157.80	10.78.157.80
82	10.78.157.81/32	10.78.157.81 – 10.78.157.81	10.78.157.81
83	10.78.157.82/32	10.78.157.82 – 10.78.157.82	10.78.157.82
84	10.78.157.83/32	10.78.157.83 – 10.78.157.83	10.78.157.83
85	10.78.157.84/32	10.78.157.84 – 10.78.157.84	10.78.157.84
86	10.78.157.85/32	10.78.157.85 – 10.78.157.85	10.78.157.85
87	10.78.157.86/32	10.78.157.86 – 10.78.157.86	10.78.157.86
88	10.78.157.87/32	10.78.157.87 – 10.78.157.87	10.78.157.87
89	10.78.157.88/32	10.78.157.88 – 10.78.157.88	10.78.157.88
90	10.78.157.89/32	10.78.157.89 – 10.78.157.89	10.78.157.89
91	10.78.157.90/32	10.78.157.90 – 10.78.157.90	10.78.157.90
92	10.78.157.91/32	10.78.157.91 – 10.78.157.91	10.78.157.91
93	10.78.157.92/32	10.78.157.92 – 10.78.157.92	10.78.157.92
94	10.78.157.93/32	10.78.157.93 – 10.78.157.93	10.78.157.93
95	10.78.157.94/32	10.78.157.94 – 10.78.157.94	10.78.157.94
96	10.78.157.95/32	10.78.157.95 – 10.78.157.95	10.78.157.95
97	10.78.157.96/32	10.78.157.96 – 10.78.157.96	10.78.157.96
98	10.78.157.97/32	10.78.157.97 – 10.78.157.97	10.78.157.97
99	10.78.157.98/32	10.78.157.98 – 10.78.157.98	10.78.157.98
100	10.78.157.99/32	10.78.157.99 – 10.78.157.99	10.78.157.99
101	10.78.157.100/32	10.78.157.100 – 10.78.157.100	10.78.157.100
102	10.78.157.101/32	10.78.157.101 – 10.78.157.101	10.78.157.101
103	10.78.157.102/32	10.78.157.102 – 10.78.157.102	10.78.157.102
104	10.78.157.103/32	10.78.157.103 – 10.78.157.103	10.78.157.103
105	10.78.157.104/32	10.78.157.104 – 10.78.157.104	10.78.157.104
106	10.78.157.105/32	10.78.157.105 – 10.78.157.105	10.78.157.105
107	10.78.157.106/32	10.78.157.106 – 10.78.157.106	10.78.157.106
108	10.78.157.107/32	10.78.157.107 – 10.78.157.107	10.78.157.107
109	10.78.157.108/32	10.78.157.108 – 10.78.157.108	10.78.157.108
110	10.78.157.109/32	10.78.157.109 – 10.78.157.109	10.78.157.109
111	10.78.157.110/32	10.78.157.110 – 10.78.157.110	10.78.157.110
112	10.78.157.111/32	10.78.157.111 – 10.78.157.111	10.78.157.111
113	10.78.157.112/32	10.78.157.112 – 10.78.157.112	10.78.157.112
114	10.78.157.113/32	10.78.157.113 – 10.78.157.113	10.78.157.113
115	10.78.157.114/32	10.78.157.114 – 10.78.157.114	10.78.157.114
116	10.78.157.115/32	10.78.157.115 – 10.78.157.115	10.78.157.115
117	10.78.157.116/32	10.78.157.116 – 10.78.157.116	10.78.157.116
118	10.78.157.117/32	10.78.157.117 – 10.78.157.117	10.78.157.117
119	10.78.157.118/32	10.78.157.118 – 10.78.157.118	10.78.157.118
120	10.78.157.119/32	10.78.157.119 – 10.78.157.119	10.78.157.119
121	10.78.157.120/32	10.78.157.120 – 10.78.157.120	10.78.157.120
122	10.78.157.121/32	10.78.157.121 – 10.78.157.121	10.78.157.121
123	10.78.157.122/32	10.78.157.122 – 10.78.157.122	10.78.157.122
124	10.78.157.123/32	10.78.157.123 – 10.78.157.123	10.78.157.123
125	10.78.157.124/32	10.78.157.124 – 10.78.157.124	10.78.157.124
126	10.78.157.125/32	10.78.157.125 – 10.78.157.125	10.78.157.125
127	10.78.157.126/32	10.78.157.126 – 10.78.157.126	10.78.157.126
128	10.78.157.127/32	10.78.157.127 – 10.78.157.127	10.78.157.127
129	10.78.157.128/32	10.78.157.128 – 10.78.157.128	10.78.157.128
130	10.78.157.129/32	10.78.157.129 – 10.78.157.129	10.78.157.129
131	10.78.157.130/32	10.78.157.130 – 10.78.157.130	10.78.157.130
132	10.78.157.131/32	10.78.157.131 – 10.78.157.131	10.78.157.131
133	10.78.157.132/32	10.78.157.132 – 10.78.157.132	10.78.157.132
134	10.78.157.133/32	10.78.157.133 – 10.78.157.133	10.78.157.133
135	10.78.157.134/32	10.78.157.134 – 10.78.157.134	10.78.157.134
136	10.78.157.135/32	10.78.157.135 – 10.78.157.135	10.78.157.135
137	10.78.157.136/32	10.78.157.136 – 10.78.157.136	10.78.157.136
138	10.78.157.137/32	10.78.157.137 – 10.78.157.137	10.78.157.137
139	10.78.157.138/32	10.78.157.138 – 10.78.157.138	10.78.157.138
140	10.78.157.139/32	10.78.157.139 – 10.78.157.139	10.78.157.139
141	10.78.157.140/32	10.78.157.140 – 10.78.157.140	10.78.157.140
142	10.78.157.141/32	10.78.157.141 – 10.78.157.141	10.78.157.141
143	10.78.157.142/32	10.78.157.142 – 10.78.157.142	10.78.157.142
144	10.78.157.143/32	10.78.157.143 – 10.78.157.143	10.78.157.143
145	10.78.157.144/32	10.78.157.144 – 10.78.157.144	10.78.157.144
146	10.78.157.145/32	10.78.157.145 – 10.78.157.145	10.78.157.145
147	10.78.157.146/32	10.78.157.146 – 10.78.157.146	10.78.157.146
148	10.78.157.147/32	10.78.157.147 – 10.78.157.147	10.78.157.147
149	10.78.157.148/32	10.78.157.148 – 10.78.157.148	10.78.157.148
150	10.78.157.149/32	10.78.157.149 – 10.78.157.149	10.78.157.149
151	10.78.157.150/32	10.78.157.150 – 10.78.157.150	10.78.157.150
152	10.78.157.151/32	10.78.157.151 – 10.78.157.151	10.78.157.151
153	10.78.157.152/32	10.78.157.152 – 10.78.157.152	10.78.157.152
154	10.78.157.153/32	10.78.157.153 – 10.78.157.153	10.78.157.153
155	10.78.157.154/32	10.78.157.154 – 10.78.157.154	10.78.157.154
156	10.78.157.155/32	10.78.157.155 – 10.78.157.155	10.78.157.155
157	10.78.157.156/32	10.78.157.156 – 10.78.157.156	10.78.157.156
158	10.78.157.157/32	10.78.157.157 – 10.78.157.157	10.78.157.157
159	10.78.157.158/32	10.78.157.158 – 10.78.157.158	10.78.157.158
160	10.78.157.159/32	10.78.157.159 – 10.78.157.159	10.78.157.159
161	10.78.157.160/32	10.78.157.160 – 10.78.157.160	10.78.157.160
162	10.78.157.161/32	10.78.157.161 – 10.78.157.161	10.78.157.161
163	10.78.157.162/32	10.78.157.162 – 10.78.157.162	10.78.157.162
164	10.78.157.163/32	10.78.157.163 – 10.78.157.163	10.78.157.163
165	10.78.157.164/32	10.78.157.164 – 10.78.157.164	10.78.157.164
166	10.78.157.165/32	10.78.157.165 – 10.78.157.165	10.78.157.165
167	10.78.157.166/32	10.78.157.166 – 10.78.157.166	10.78.157.166
168	10.78.157.167/32	10.78.157.167 – 10.78.157.167	10.78.157.167
169	10.78.157.168/32	10.78.157.168 – 10.78.157.168	10.78.157.168
170	10.78.157.169/32	10.78.157.169 – 10.78.157.169	10.78.157.169
171	10.78.157.170/32	10.78.157.170 – 10.78.157.170	10.78.157.170
172	10.78.157.171/32	10.78.157.171 – 10.78.157.171	10.78.157.171
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174	10.78.157.173/32	10.78.157.173 – 10.78.157.173	10.78.157.173
175	10.78.157.174/32	10.78.157.174 – 10.78.157.174	10.78.157.174
176	10.78.157.175/32	10.78.157.175 – 10.78.157.175	10.78.157.175
177	10.78.157.176/32	10.78.157.176 – 10.78.157.176	10.78.157.176
178	10.78.157.177/32	10.78.157.177 – 10.78.157.177	10.78.157.177
179	10.78.157.178/32	10.78.157.178 – 10.78.157.178	10.78.157.178
180	10.78.157.179/32	10.78.157.179 – 10.78.157.179	10.78.157.179
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198	10.78.157.197/32	10.78.157.197 – 10.78.157.197	10.78.157.197
199	10.78.157.198/32	10.78.157.198 – 10.78.157.198	10.78.157.198
200	10.78.157.199/32	10.78.157.199 – 10.78.157.199	10.78.157.199
201	10.78.157.200/32	10.78.157.200 – 10.78.157.200	10.78.157.200
202	10.78.157.201/32	10.78.157.201 – 10.78.157.201	10.78.157.201
203	10.78.157.202/32	10.78.157.202 – 10.78.157.202	10.78.157.202
204	10.78.157.203/32	10.78.157.203 – 10.78.157.203	10.78.157.203
205	10.78.157.204/32	10.78.157.204 – 10.78.157.204	10.78.157.204
206	10.78.157.205/32	10.78.157.205 – 10.78.157.205	10.78.157.205
207	10.78.157.206/32	10.78.157.206 – 10.78.157.206	10.78.157.206
208	10.78.157.207/32	10.78.157.207 – 10.78.157.207	10.78.157.207
209	10.78.157.208/32	10.78.157.208 – 10.78.157.208	10.78.157.208
210	10.78.157.209/32	10.78.157.209 – 10.78.157.209	10.78.157.209
211	10.78.157.210/32	10.78.157.210 – 10.78.157.210	10.78.157.210
212	10.78.157.211/32	10.78.157.211 – 10.78.157.211	10.78.157.211
213	10.78.157.212/32	10.78.157.212 – 10.78.157.212	10.78.157.212
214	10.78.157.213/32	10.78.157.213 – 10.78.157.213	10.78.157.213
215	10.78.157.214/32	10.78.157.214 – 10.78.157.214	10.78.157.214
216	10.78.157.215/32	10.78.157.215 – 10.78.157.215	10.78.157.215
217	10.78.157.216/32	10.78.157.216 – 10.78.157.216	10.78.157.216
218	10.78.157.217/32	10.78.157.217 – 10.78.157.217	10.78.157.217
219	10.78.157.218/32	10.78.157.218 – 10.78.157.218	10.78.157.218
220	10.78.157.219/32	10.78.157.219 – 10.78.157.219	10.78.157.219
221	10.78.157.220/32	10.78.157.220 – 10.78.157.220	10.78.157.220
222	10.78.157.221/32	10.78.157.221 – 10.78.157.221	10.78.157.221
223	10.78.157.222/32	10.78.157.222 – 10.78.157.222	10.78.157.222
224	10.78.157.223/32	10.78.157.223 – 10.78.157.223	10.78.157.223
225	10.78.157.224/32	10.78.157.224 – 10.78.157.224	10.78.157.224
226	10.78.157.225/32	10.78.157.225 – 10.78.157.225	10.78.157.225
227	10.78.157.226/32	10.78.157.226 – 10.78.157.226	10.78.157.226
228	10.78.157.227/32	10.78.157.227 – 10.78.157.227	10.78.157.227
229	10.78.157.228/32	10.78.157.228 – 10.78.157.228	10.78.157.228
230	10.78.157.229/32	10.78.157.229 – 10.78.157.229	10.78.157.229
231	10.78.157.230/32	10.78.157.230 – 10.78.157.230	10.78.157.230
232	10.78.157.231/32	10.78.157.231 – 10.78.157.231	10.78.157.231
233	10.78.157.232/32	10.78.157.232 – 10.78.157.232	10.78.157.232
234	10.78.157.233/32	10.78.157.233 – 10.78.157.233	10.78.157.233
235	10.78.157.234/32	10.78.157.234 – 10.78.157.234	10.78.157.234
236	10.78.157.235/32	10.78.157.235 – 10.78.157.235	10.78.157.235
237	10.78.157.236/32	10.78.157.236 – 10.78.157.236	10.78.157.236
238	10.78.157.237/32	10.78.157.237 – 10.78.157.237	10.78.157.237
239	10.78.157.238/32	10.78.157.238 – 10.78.157.238	10.78.157.238
240	10.78.157.239/32	10.78.157.239 – 10.78.157.239	10.78.157.239
241	10.78.157.240/32	10.78.157.240 – 10.78.157.240	10.78.157.240
242	10.78.157.241/32	10.78.157.241 – 10.78.157.241	10.78.157.241
243	10.78.157.242/32	10.78.157.242 – 10.78.157.242	10.78.157.242
244	10.78.157.243/32	10.78.157.243 – 10.78.157.243	10.78.157.243
245	10.78.157.244/32	10.78.157.244 – 10.78.157.244	10.78.157.244
246	10.78.157.245/32	10.78.157.245 – 10.78.157.245	10.78.157.245
247	10.78.157.246/32	10.78.157.246 – 10.78.157.246	10.78.157.246
248	10.78.157.247/32	10.78.157.247 – 10.78.157.247	10.78.157.247
249	10.78.157.248/32	10.78.157.248 – 10.78.157.248	10.78.157.248
250	10.78.157.249/32	10.78.157.249 – 10.78.157.249	10.78.157.249
251	10.78.157.250/32	10.78.157.250 – 10.78.157.250	10.78.157.250
252	10.78.157.251/32	10.78.157.251 – 10.78.157.251	10.78.157.251
253	10.78.157.252/32	10.78.157.252 – 10.78.157.252	10.78.157.252
254	10.78.157.253/32	10.78.157.253 – 10.78.157.253	10.78.157.253
255	10.78.157.254/32	10.78.157.254 – 10.78.157.254	10.78.157.254
256	10.78.157.255/32	10.78.157.255 – 10.78.157.255	10.78.157.255

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 →