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)10.55.67.0/24

network10.55.67.0/24

broadcast10.55.67.255

first host10.55.67.1

last host10.55.67.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.55.67.0/24

address00001010.00110111.01000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00110111.01000011.00000000

broadcast00001010.00110111.01000011.11111111

green = network part, grey = host part

hex0x0a374300

decimal171393792

reverse dns0.67.55.10.in-addr.arpa

ipv4-mapped::ffff:a37:4300

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.55.67.0/32	10.55.67.0 – 10.55.67.0	10.55.67.0
2	10.55.67.1/32	10.55.67.1 – 10.55.67.1	10.55.67.1
3	10.55.67.2/32	10.55.67.2 – 10.55.67.2	10.55.67.2
4	10.55.67.3/32	10.55.67.3 – 10.55.67.3	10.55.67.3
5	10.55.67.4/32	10.55.67.4 – 10.55.67.4	10.55.67.4
6	10.55.67.5/32	10.55.67.5 – 10.55.67.5	10.55.67.5
7	10.55.67.6/32	10.55.67.6 – 10.55.67.6	10.55.67.6
8	10.55.67.7/32	10.55.67.7 – 10.55.67.7	10.55.67.7
9	10.55.67.8/32	10.55.67.8 – 10.55.67.8	10.55.67.8
10	10.55.67.9/32	10.55.67.9 – 10.55.67.9	10.55.67.9
11	10.55.67.10/32	10.55.67.10 – 10.55.67.10	10.55.67.10
12	10.55.67.11/32	10.55.67.11 – 10.55.67.11	10.55.67.11
13	10.55.67.12/32	10.55.67.12 – 10.55.67.12	10.55.67.12
14	10.55.67.13/32	10.55.67.13 – 10.55.67.13	10.55.67.13
15	10.55.67.14/32	10.55.67.14 – 10.55.67.14	10.55.67.14
16	10.55.67.15/32	10.55.67.15 – 10.55.67.15	10.55.67.15
17	10.55.67.16/32	10.55.67.16 – 10.55.67.16	10.55.67.16
18	10.55.67.17/32	10.55.67.17 – 10.55.67.17	10.55.67.17
19	10.55.67.18/32	10.55.67.18 – 10.55.67.18	10.55.67.18
20	10.55.67.19/32	10.55.67.19 – 10.55.67.19	10.55.67.19
21	10.55.67.20/32	10.55.67.20 – 10.55.67.20	10.55.67.20
22	10.55.67.21/32	10.55.67.21 – 10.55.67.21	10.55.67.21
23	10.55.67.22/32	10.55.67.22 – 10.55.67.22	10.55.67.22
24	10.55.67.23/32	10.55.67.23 – 10.55.67.23	10.55.67.23
25	10.55.67.24/32	10.55.67.24 – 10.55.67.24	10.55.67.24
26	10.55.67.25/32	10.55.67.25 – 10.55.67.25	10.55.67.25
27	10.55.67.26/32	10.55.67.26 – 10.55.67.26	10.55.67.26
28	10.55.67.27/32	10.55.67.27 – 10.55.67.27	10.55.67.27
29	10.55.67.28/32	10.55.67.28 – 10.55.67.28	10.55.67.28
30	10.55.67.29/32	10.55.67.29 – 10.55.67.29	10.55.67.29
31	10.55.67.30/32	10.55.67.30 – 10.55.67.30	10.55.67.30
32	10.55.67.31/32	10.55.67.31 – 10.55.67.31	10.55.67.31
33	10.55.67.32/32	10.55.67.32 – 10.55.67.32	10.55.67.32
34	10.55.67.33/32	10.55.67.33 – 10.55.67.33	10.55.67.33
35	10.55.67.34/32	10.55.67.34 – 10.55.67.34	10.55.67.34
36	10.55.67.35/32	10.55.67.35 – 10.55.67.35	10.55.67.35
37	10.55.67.36/32	10.55.67.36 – 10.55.67.36	10.55.67.36
38	10.55.67.37/32	10.55.67.37 – 10.55.67.37	10.55.67.37
39	10.55.67.38/32	10.55.67.38 – 10.55.67.38	10.55.67.38
40	10.55.67.39/32	10.55.67.39 – 10.55.67.39	10.55.67.39
41	10.55.67.40/32	10.55.67.40 – 10.55.67.40	10.55.67.40
42	10.55.67.41/32	10.55.67.41 – 10.55.67.41	10.55.67.41
43	10.55.67.42/32	10.55.67.42 – 10.55.67.42	10.55.67.42
44	10.55.67.43/32	10.55.67.43 – 10.55.67.43	10.55.67.43
45	10.55.67.44/32	10.55.67.44 – 10.55.67.44	10.55.67.44
46	10.55.67.45/32	10.55.67.45 – 10.55.67.45	10.55.67.45
47	10.55.67.46/32	10.55.67.46 – 10.55.67.46	10.55.67.46
48	10.55.67.47/32	10.55.67.47 – 10.55.67.47	10.55.67.47
49	10.55.67.48/32	10.55.67.48 – 10.55.67.48	10.55.67.48
50	10.55.67.49/32	10.55.67.49 – 10.55.67.49	10.55.67.49
51	10.55.67.50/32	10.55.67.50 – 10.55.67.50	10.55.67.50
52	10.55.67.51/32	10.55.67.51 – 10.55.67.51	10.55.67.51
53	10.55.67.52/32	10.55.67.52 – 10.55.67.52	10.55.67.52
54	10.55.67.53/32	10.55.67.53 – 10.55.67.53	10.55.67.53
55	10.55.67.54/32	10.55.67.54 – 10.55.67.54	10.55.67.54
56	10.55.67.55/32	10.55.67.55 – 10.55.67.55	10.55.67.55
57	10.55.67.56/32	10.55.67.56 – 10.55.67.56	10.55.67.56
58	10.55.67.57/32	10.55.67.57 – 10.55.67.57	10.55.67.57
59	10.55.67.58/32	10.55.67.58 – 10.55.67.58	10.55.67.58
60	10.55.67.59/32	10.55.67.59 – 10.55.67.59	10.55.67.59
61	10.55.67.60/32	10.55.67.60 – 10.55.67.60	10.55.67.60
62	10.55.67.61/32	10.55.67.61 – 10.55.67.61	10.55.67.61
63	10.55.67.62/32	10.55.67.62 – 10.55.67.62	10.55.67.62
64	10.55.67.63/32	10.55.67.63 – 10.55.67.63	10.55.67.63
65	10.55.67.64/32	10.55.67.64 – 10.55.67.64	10.55.67.64
66	10.55.67.65/32	10.55.67.65 – 10.55.67.65	10.55.67.65
67	10.55.67.66/32	10.55.67.66 – 10.55.67.66	10.55.67.66
68	10.55.67.67/32	10.55.67.67 – 10.55.67.67	10.55.67.67
69	10.55.67.68/32	10.55.67.68 – 10.55.67.68	10.55.67.68
70	10.55.67.69/32	10.55.67.69 – 10.55.67.69	10.55.67.69
71	10.55.67.70/32	10.55.67.70 – 10.55.67.70	10.55.67.70
72	10.55.67.71/32	10.55.67.71 – 10.55.67.71	10.55.67.71
73	10.55.67.72/32	10.55.67.72 – 10.55.67.72	10.55.67.72
74	10.55.67.73/32	10.55.67.73 – 10.55.67.73	10.55.67.73
75	10.55.67.74/32	10.55.67.74 – 10.55.67.74	10.55.67.74
76	10.55.67.75/32	10.55.67.75 – 10.55.67.75	10.55.67.75
77	10.55.67.76/32	10.55.67.76 – 10.55.67.76	10.55.67.76
78	10.55.67.77/32	10.55.67.77 – 10.55.67.77	10.55.67.77
79	10.55.67.78/32	10.55.67.78 – 10.55.67.78	10.55.67.78
80	10.55.67.79/32	10.55.67.79 – 10.55.67.79	10.55.67.79
81	10.55.67.80/32	10.55.67.80 – 10.55.67.80	10.55.67.80
82	10.55.67.81/32	10.55.67.81 – 10.55.67.81	10.55.67.81
83	10.55.67.82/32	10.55.67.82 – 10.55.67.82	10.55.67.82
84	10.55.67.83/32	10.55.67.83 – 10.55.67.83	10.55.67.83
85	10.55.67.84/32	10.55.67.84 – 10.55.67.84	10.55.67.84
86	10.55.67.85/32	10.55.67.85 – 10.55.67.85	10.55.67.85
87	10.55.67.86/32	10.55.67.86 – 10.55.67.86	10.55.67.86
88	10.55.67.87/32	10.55.67.87 – 10.55.67.87	10.55.67.87
89	10.55.67.88/32	10.55.67.88 – 10.55.67.88	10.55.67.88
90	10.55.67.89/32	10.55.67.89 – 10.55.67.89	10.55.67.89
91	10.55.67.90/32	10.55.67.90 – 10.55.67.90	10.55.67.90
92	10.55.67.91/32	10.55.67.91 – 10.55.67.91	10.55.67.91
93	10.55.67.92/32	10.55.67.92 – 10.55.67.92	10.55.67.92
94	10.55.67.93/32	10.55.67.93 – 10.55.67.93	10.55.67.93
95	10.55.67.94/32	10.55.67.94 – 10.55.67.94	10.55.67.94
96	10.55.67.95/32	10.55.67.95 – 10.55.67.95	10.55.67.95
97	10.55.67.96/32	10.55.67.96 – 10.55.67.96	10.55.67.96
98	10.55.67.97/32	10.55.67.97 – 10.55.67.97	10.55.67.97
99	10.55.67.98/32	10.55.67.98 – 10.55.67.98	10.55.67.98
100	10.55.67.99/32	10.55.67.99 – 10.55.67.99	10.55.67.99
101	10.55.67.100/32	10.55.67.100 – 10.55.67.100	10.55.67.100
102	10.55.67.101/32	10.55.67.101 – 10.55.67.101	10.55.67.101
103	10.55.67.102/32	10.55.67.102 – 10.55.67.102	10.55.67.102
104	10.55.67.103/32	10.55.67.103 – 10.55.67.103	10.55.67.103
105	10.55.67.104/32	10.55.67.104 – 10.55.67.104	10.55.67.104
106	10.55.67.105/32	10.55.67.105 – 10.55.67.105	10.55.67.105
107	10.55.67.106/32	10.55.67.106 – 10.55.67.106	10.55.67.106
108	10.55.67.107/32	10.55.67.107 – 10.55.67.107	10.55.67.107
109	10.55.67.108/32	10.55.67.108 – 10.55.67.108	10.55.67.108
110	10.55.67.109/32	10.55.67.109 – 10.55.67.109	10.55.67.109
111	10.55.67.110/32	10.55.67.110 – 10.55.67.110	10.55.67.110
112	10.55.67.111/32	10.55.67.111 – 10.55.67.111	10.55.67.111
113	10.55.67.112/32	10.55.67.112 – 10.55.67.112	10.55.67.112
114	10.55.67.113/32	10.55.67.113 – 10.55.67.113	10.55.67.113
115	10.55.67.114/32	10.55.67.114 – 10.55.67.114	10.55.67.114
116	10.55.67.115/32	10.55.67.115 – 10.55.67.115	10.55.67.115
117	10.55.67.116/32	10.55.67.116 – 10.55.67.116	10.55.67.116
118	10.55.67.117/32	10.55.67.117 – 10.55.67.117	10.55.67.117
119	10.55.67.118/32	10.55.67.118 – 10.55.67.118	10.55.67.118
120	10.55.67.119/32	10.55.67.119 – 10.55.67.119	10.55.67.119
121	10.55.67.120/32	10.55.67.120 – 10.55.67.120	10.55.67.120
122	10.55.67.121/32	10.55.67.121 – 10.55.67.121	10.55.67.121
123	10.55.67.122/32	10.55.67.122 – 10.55.67.122	10.55.67.122
124	10.55.67.123/32	10.55.67.123 – 10.55.67.123	10.55.67.123
125	10.55.67.124/32	10.55.67.124 – 10.55.67.124	10.55.67.124
126	10.55.67.125/32	10.55.67.125 – 10.55.67.125	10.55.67.125
127	10.55.67.126/32	10.55.67.126 – 10.55.67.126	10.55.67.126
128	10.55.67.127/32	10.55.67.127 – 10.55.67.127	10.55.67.127
129	10.55.67.128/32	10.55.67.128 – 10.55.67.128	10.55.67.128
130	10.55.67.129/32	10.55.67.129 – 10.55.67.129	10.55.67.129
131	10.55.67.130/32	10.55.67.130 – 10.55.67.130	10.55.67.130
132	10.55.67.131/32	10.55.67.131 – 10.55.67.131	10.55.67.131
133	10.55.67.132/32	10.55.67.132 – 10.55.67.132	10.55.67.132
134	10.55.67.133/32	10.55.67.133 – 10.55.67.133	10.55.67.133
135	10.55.67.134/32	10.55.67.134 – 10.55.67.134	10.55.67.134
136	10.55.67.135/32	10.55.67.135 – 10.55.67.135	10.55.67.135
137	10.55.67.136/32	10.55.67.136 – 10.55.67.136	10.55.67.136
138	10.55.67.137/32	10.55.67.137 – 10.55.67.137	10.55.67.137
139	10.55.67.138/32	10.55.67.138 – 10.55.67.138	10.55.67.138
140	10.55.67.139/32	10.55.67.139 – 10.55.67.139	10.55.67.139
141	10.55.67.140/32	10.55.67.140 – 10.55.67.140	10.55.67.140
142	10.55.67.141/32	10.55.67.141 – 10.55.67.141	10.55.67.141
143	10.55.67.142/32	10.55.67.142 – 10.55.67.142	10.55.67.142
144	10.55.67.143/32	10.55.67.143 – 10.55.67.143	10.55.67.143
145	10.55.67.144/32	10.55.67.144 – 10.55.67.144	10.55.67.144
146	10.55.67.145/32	10.55.67.145 – 10.55.67.145	10.55.67.145
147	10.55.67.146/32	10.55.67.146 – 10.55.67.146	10.55.67.146
148	10.55.67.147/32	10.55.67.147 – 10.55.67.147	10.55.67.147
149	10.55.67.148/32	10.55.67.148 – 10.55.67.148	10.55.67.148
150	10.55.67.149/32	10.55.67.149 – 10.55.67.149	10.55.67.149
151	10.55.67.150/32	10.55.67.150 – 10.55.67.150	10.55.67.150
152	10.55.67.151/32	10.55.67.151 – 10.55.67.151	10.55.67.151
153	10.55.67.152/32	10.55.67.152 – 10.55.67.152	10.55.67.152
154	10.55.67.153/32	10.55.67.153 – 10.55.67.153	10.55.67.153
155	10.55.67.154/32	10.55.67.154 – 10.55.67.154	10.55.67.154
156	10.55.67.155/32	10.55.67.155 – 10.55.67.155	10.55.67.155
157	10.55.67.156/32	10.55.67.156 – 10.55.67.156	10.55.67.156
158	10.55.67.157/32	10.55.67.157 – 10.55.67.157	10.55.67.157
159	10.55.67.158/32	10.55.67.158 – 10.55.67.158	10.55.67.158
160	10.55.67.159/32	10.55.67.159 – 10.55.67.159	10.55.67.159
161	10.55.67.160/32	10.55.67.160 – 10.55.67.160	10.55.67.160
162	10.55.67.161/32	10.55.67.161 – 10.55.67.161	10.55.67.161
163	10.55.67.162/32	10.55.67.162 – 10.55.67.162	10.55.67.162
164	10.55.67.163/32	10.55.67.163 – 10.55.67.163	10.55.67.163
165	10.55.67.164/32	10.55.67.164 – 10.55.67.164	10.55.67.164
166	10.55.67.165/32	10.55.67.165 – 10.55.67.165	10.55.67.165
167	10.55.67.166/32	10.55.67.166 – 10.55.67.166	10.55.67.166
168	10.55.67.167/32	10.55.67.167 – 10.55.67.167	10.55.67.167
169	10.55.67.168/32	10.55.67.168 – 10.55.67.168	10.55.67.168
170	10.55.67.169/32	10.55.67.169 – 10.55.67.169	10.55.67.169
171	10.55.67.170/32	10.55.67.170 – 10.55.67.170	10.55.67.170
172	10.55.67.171/32	10.55.67.171 – 10.55.67.171	10.55.67.171
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174	10.55.67.173/32	10.55.67.173 – 10.55.67.173	10.55.67.173
175	10.55.67.174/32	10.55.67.174 – 10.55.67.174	10.55.67.174
176	10.55.67.175/32	10.55.67.175 – 10.55.67.175	10.55.67.175
177	10.55.67.176/32	10.55.67.176 – 10.55.67.176	10.55.67.176
178	10.55.67.177/32	10.55.67.177 – 10.55.67.177	10.55.67.177
179	10.55.67.178/32	10.55.67.178 – 10.55.67.178	10.55.67.178
180	10.55.67.179/32	10.55.67.179 – 10.55.67.179	10.55.67.179
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198	10.55.67.197/32	10.55.67.197 – 10.55.67.197	10.55.67.197
199	10.55.67.198/32	10.55.67.198 – 10.55.67.198	10.55.67.198
200	10.55.67.199/32	10.55.67.199 – 10.55.67.199	10.55.67.199
201	10.55.67.200/32	10.55.67.200 – 10.55.67.200	10.55.67.200
202	10.55.67.201/32	10.55.67.201 – 10.55.67.201	10.55.67.201
203	10.55.67.202/32	10.55.67.202 – 10.55.67.202	10.55.67.202
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205	10.55.67.204/32	10.55.67.204 – 10.55.67.204	10.55.67.204
206	10.55.67.205/32	10.55.67.205 – 10.55.67.205	10.55.67.205
207	10.55.67.206/32	10.55.67.206 – 10.55.67.206	10.55.67.206
208	10.55.67.207/32	10.55.67.207 – 10.55.67.207	10.55.67.207
209	10.55.67.208/32	10.55.67.208 – 10.55.67.208	10.55.67.208
210	10.55.67.209/32	10.55.67.209 – 10.55.67.209	10.55.67.209
211	10.55.67.210/32	10.55.67.210 – 10.55.67.210	10.55.67.210
212	10.55.67.211/32	10.55.67.211 – 10.55.67.211	10.55.67.211
213	10.55.67.212/32	10.55.67.212 – 10.55.67.212	10.55.67.212
214	10.55.67.213/32	10.55.67.213 – 10.55.67.213	10.55.67.213
215	10.55.67.214/32	10.55.67.214 – 10.55.67.214	10.55.67.214
216	10.55.67.215/32	10.55.67.215 – 10.55.67.215	10.55.67.215
217	10.55.67.216/32	10.55.67.216 – 10.55.67.216	10.55.67.216
218	10.55.67.217/32	10.55.67.217 – 10.55.67.217	10.55.67.217
219	10.55.67.218/32	10.55.67.218 – 10.55.67.218	10.55.67.218
220	10.55.67.219/32	10.55.67.219 – 10.55.67.219	10.55.67.219
221	10.55.67.220/32	10.55.67.220 – 10.55.67.220	10.55.67.220
222	10.55.67.221/32	10.55.67.221 – 10.55.67.221	10.55.67.221
223	10.55.67.222/32	10.55.67.222 – 10.55.67.222	10.55.67.222
224	10.55.67.223/32	10.55.67.223 – 10.55.67.223	10.55.67.223
225	10.55.67.224/32	10.55.67.224 – 10.55.67.224	10.55.67.224
226	10.55.67.225/32	10.55.67.225 – 10.55.67.225	10.55.67.225
227	10.55.67.226/32	10.55.67.226 – 10.55.67.226	10.55.67.226
228	10.55.67.227/32	10.55.67.227 – 10.55.67.227	10.55.67.227
229	10.55.67.228/32	10.55.67.228 – 10.55.67.228	10.55.67.228
230	10.55.67.229/32	10.55.67.229 – 10.55.67.229	10.55.67.229
231	10.55.67.230/32	10.55.67.230 – 10.55.67.230	10.55.67.230
232	10.55.67.231/32	10.55.67.231 – 10.55.67.231	10.55.67.231
233	10.55.67.232/32	10.55.67.232 – 10.55.67.232	10.55.67.232
234	10.55.67.233/32	10.55.67.233 – 10.55.67.233	10.55.67.233
235	10.55.67.234/32	10.55.67.234 – 10.55.67.234	10.55.67.234
236	10.55.67.235/32	10.55.67.235 – 10.55.67.235	10.55.67.235
237	10.55.67.236/32	10.55.67.236 – 10.55.67.236	10.55.67.236
238	10.55.67.237/32	10.55.67.237 – 10.55.67.237	10.55.67.237
239	10.55.67.238/32	10.55.67.238 – 10.55.67.238	10.55.67.238
240	10.55.67.239/32	10.55.67.239 – 10.55.67.239	10.55.67.239
241	10.55.67.240/32	10.55.67.240 – 10.55.67.240	10.55.67.240
242	10.55.67.241/32	10.55.67.241 – 10.55.67.241	10.55.67.241
243	10.55.67.242/32	10.55.67.242 – 10.55.67.242	10.55.67.242
244	10.55.67.243/32	10.55.67.243 – 10.55.67.243	10.55.67.243
245	10.55.67.244/32	10.55.67.244 – 10.55.67.244	10.55.67.244
246	10.55.67.245/32	10.55.67.245 – 10.55.67.245	10.55.67.245
247	10.55.67.246/32	10.55.67.246 – 10.55.67.246	10.55.67.246
248	10.55.67.247/32	10.55.67.247 – 10.55.67.247	10.55.67.247
249	10.55.67.248/32	10.55.67.248 – 10.55.67.248	10.55.67.248
250	10.55.67.249/32	10.55.67.249 – 10.55.67.249	10.55.67.249
251	10.55.67.250/32	10.55.67.250 – 10.55.67.250	10.55.67.250
252	10.55.67.251/32	10.55.67.251 – 10.55.67.251	10.55.67.251
253	10.55.67.252/32	10.55.67.252 – 10.55.67.252	10.55.67.252
254	10.55.67.253/32	10.55.67.253 – 10.55.67.253	10.55.67.253
255	10.55.67.254/32	10.55.67.254 – 10.55.67.254	10.55.67.254
256	10.55.67.255/32	10.55.67.255 – 10.55.67.255	10.55.67.255

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 →