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)10.2.219.0/24

network10.2.219.0/24

broadcast10.2.219.255

first host10.2.219.1

last host10.2.219.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.219.0/24

address00001010.00000010.11011011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11011011.00000000

broadcast00001010.00000010.11011011.11111111

green = network part, grey = host part

hex0x0a02db00

decimal167959296

reverse dns0.219.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:db00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.219.0/32	10.2.219.0 – 10.2.219.0	10.2.219.0
2	10.2.219.1/32	10.2.219.1 – 10.2.219.1	10.2.219.1
3	10.2.219.2/32	10.2.219.2 – 10.2.219.2	10.2.219.2
4	10.2.219.3/32	10.2.219.3 – 10.2.219.3	10.2.219.3
5	10.2.219.4/32	10.2.219.4 – 10.2.219.4	10.2.219.4
6	10.2.219.5/32	10.2.219.5 – 10.2.219.5	10.2.219.5
7	10.2.219.6/32	10.2.219.6 – 10.2.219.6	10.2.219.6
8	10.2.219.7/32	10.2.219.7 – 10.2.219.7	10.2.219.7
9	10.2.219.8/32	10.2.219.8 – 10.2.219.8	10.2.219.8
10	10.2.219.9/32	10.2.219.9 – 10.2.219.9	10.2.219.9
11	10.2.219.10/32	10.2.219.10 – 10.2.219.10	10.2.219.10
12	10.2.219.11/32	10.2.219.11 – 10.2.219.11	10.2.219.11
13	10.2.219.12/32	10.2.219.12 – 10.2.219.12	10.2.219.12
14	10.2.219.13/32	10.2.219.13 – 10.2.219.13	10.2.219.13
15	10.2.219.14/32	10.2.219.14 – 10.2.219.14	10.2.219.14
16	10.2.219.15/32	10.2.219.15 – 10.2.219.15	10.2.219.15
17	10.2.219.16/32	10.2.219.16 – 10.2.219.16	10.2.219.16
18	10.2.219.17/32	10.2.219.17 – 10.2.219.17	10.2.219.17
19	10.2.219.18/32	10.2.219.18 – 10.2.219.18	10.2.219.18
20	10.2.219.19/32	10.2.219.19 – 10.2.219.19	10.2.219.19
21	10.2.219.20/32	10.2.219.20 – 10.2.219.20	10.2.219.20
22	10.2.219.21/32	10.2.219.21 – 10.2.219.21	10.2.219.21
23	10.2.219.22/32	10.2.219.22 – 10.2.219.22	10.2.219.22
24	10.2.219.23/32	10.2.219.23 – 10.2.219.23	10.2.219.23
25	10.2.219.24/32	10.2.219.24 – 10.2.219.24	10.2.219.24
26	10.2.219.25/32	10.2.219.25 – 10.2.219.25	10.2.219.25
27	10.2.219.26/32	10.2.219.26 – 10.2.219.26	10.2.219.26
28	10.2.219.27/32	10.2.219.27 – 10.2.219.27	10.2.219.27
29	10.2.219.28/32	10.2.219.28 – 10.2.219.28	10.2.219.28
30	10.2.219.29/32	10.2.219.29 – 10.2.219.29	10.2.219.29
31	10.2.219.30/32	10.2.219.30 – 10.2.219.30	10.2.219.30
32	10.2.219.31/32	10.2.219.31 – 10.2.219.31	10.2.219.31
33	10.2.219.32/32	10.2.219.32 – 10.2.219.32	10.2.219.32
34	10.2.219.33/32	10.2.219.33 – 10.2.219.33	10.2.219.33
35	10.2.219.34/32	10.2.219.34 – 10.2.219.34	10.2.219.34
36	10.2.219.35/32	10.2.219.35 – 10.2.219.35	10.2.219.35
37	10.2.219.36/32	10.2.219.36 – 10.2.219.36	10.2.219.36
38	10.2.219.37/32	10.2.219.37 – 10.2.219.37	10.2.219.37
39	10.2.219.38/32	10.2.219.38 – 10.2.219.38	10.2.219.38
40	10.2.219.39/32	10.2.219.39 – 10.2.219.39	10.2.219.39
41	10.2.219.40/32	10.2.219.40 – 10.2.219.40	10.2.219.40
42	10.2.219.41/32	10.2.219.41 – 10.2.219.41	10.2.219.41
43	10.2.219.42/32	10.2.219.42 – 10.2.219.42	10.2.219.42
44	10.2.219.43/32	10.2.219.43 – 10.2.219.43	10.2.219.43
45	10.2.219.44/32	10.2.219.44 – 10.2.219.44	10.2.219.44
46	10.2.219.45/32	10.2.219.45 – 10.2.219.45	10.2.219.45
47	10.2.219.46/32	10.2.219.46 – 10.2.219.46	10.2.219.46
48	10.2.219.47/32	10.2.219.47 – 10.2.219.47	10.2.219.47
49	10.2.219.48/32	10.2.219.48 – 10.2.219.48	10.2.219.48
50	10.2.219.49/32	10.2.219.49 – 10.2.219.49	10.2.219.49
51	10.2.219.50/32	10.2.219.50 – 10.2.219.50	10.2.219.50
52	10.2.219.51/32	10.2.219.51 – 10.2.219.51	10.2.219.51
53	10.2.219.52/32	10.2.219.52 – 10.2.219.52	10.2.219.52
54	10.2.219.53/32	10.2.219.53 – 10.2.219.53	10.2.219.53
55	10.2.219.54/32	10.2.219.54 – 10.2.219.54	10.2.219.54
56	10.2.219.55/32	10.2.219.55 – 10.2.219.55	10.2.219.55
57	10.2.219.56/32	10.2.219.56 – 10.2.219.56	10.2.219.56
58	10.2.219.57/32	10.2.219.57 – 10.2.219.57	10.2.219.57
59	10.2.219.58/32	10.2.219.58 – 10.2.219.58	10.2.219.58
60	10.2.219.59/32	10.2.219.59 – 10.2.219.59	10.2.219.59
61	10.2.219.60/32	10.2.219.60 – 10.2.219.60	10.2.219.60
62	10.2.219.61/32	10.2.219.61 – 10.2.219.61	10.2.219.61
63	10.2.219.62/32	10.2.219.62 – 10.2.219.62	10.2.219.62
64	10.2.219.63/32	10.2.219.63 – 10.2.219.63	10.2.219.63
65	10.2.219.64/32	10.2.219.64 – 10.2.219.64	10.2.219.64
66	10.2.219.65/32	10.2.219.65 – 10.2.219.65	10.2.219.65
67	10.2.219.66/32	10.2.219.66 – 10.2.219.66	10.2.219.66
68	10.2.219.67/32	10.2.219.67 – 10.2.219.67	10.2.219.67
69	10.2.219.68/32	10.2.219.68 – 10.2.219.68	10.2.219.68
70	10.2.219.69/32	10.2.219.69 – 10.2.219.69	10.2.219.69
71	10.2.219.70/32	10.2.219.70 – 10.2.219.70	10.2.219.70
72	10.2.219.71/32	10.2.219.71 – 10.2.219.71	10.2.219.71
73	10.2.219.72/32	10.2.219.72 – 10.2.219.72	10.2.219.72
74	10.2.219.73/32	10.2.219.73 – 10.2.219.73	10.2.219.73
75	10.2.219.74/32	10.2.219.74 – 10.2.219.74	10.2.219.74
76	10.2.219.75/32	10.2.219.75 – 10.2.219.75	10.2.219.75
77	10.2.219.76/32	10.2.219.76 – 10.2.219.76	10.2.219.76
78	10.2.219.77/32	10.2.219.77 – 10.2.219.77	10.2.219.77
79	10.2.219.78/32	10.2.219.78 – 10.2.219.78	10.2.219.78
80	10.2.219.79/32	10.2.219.79 – 10.2.219.79	10.2.219.79
81	10.2.219.80/32	10.2.219.80 – 10.2.219.80	10.2.219.80
82	10.2.219.81/32	10.2.219.81 – 10.2.219.81	10.2.219.81
83	10.2.219.82/32	10.2.219.82 – 10.2.219.82	10.2.219.82
84	10.2.219.83/32	10.2.219.83 – 10.2.219.83	10.2.219.83
85	10.2.219.84/32	10.2.219.84 – 10.2.219.84	10.2.219.84
86	10.2.219.85/32	10.2.219.85 – 10.2.219.85	10.2.219.85
87	10.2.219.86/32	10.2.219.86 – 10.2.219.86	10.2.219.86
88	10.2.219.87/32	10.2.219.87 – 10.2.219.87	10.2.219.87
89	10.2.219.88/32	10.2.219.88 – 10.2.219.88	10.2.219.88
90	10.2.219.89/32	10.2.219.89 – 10.2.219.89	10.2.219.89
91	10.2.219.90/32	10.2.219.90 – 10.2.219.90	10.2.219.90
92	10.2.219.91/32	10.2.219.91 – 10.2.219.91	10.2.219.91
93	10.2.219.92/32	10.2.219.92 – 10.2.219.92	10.2.219.92
94	10.2.219.93/32	10.2.219.93 – 10.2.219.93	10.2.219.93
95	10.2.219.94/32	10.2.219.94 – 10.2.219.94	10.2.219.94
96	10.2.219.95/32	10.2.219.95 – 10.2.219.95	10.2.219.95
97	10.2.219.96/32	10.2.219.96 – 10.2.219.96	10.2.219.96
98	10.2.219.97/32	10.2.219.97 – 10.2.219.97	10.2.219.97
99	10.2.219.98/32	10.2.219.98 – 10.2.219.98	10.2.219.98
100	10.2.219.99/32	10.2.219.99 – 10.2.219.99	10.2.219.99
101	10.2.219.100/32	10.2.219.100 – 10.2.219.100	10.2.219.100
102	10.2.219.101/32	10.2.219.101 – 10.2.219.101	10.2.219.101
103	10.2.219.102/32	10.2.219.102 – 10.2.219.102	10.2.219.102
104	10.2.219.103/32	10.2.219.103 – 10.2.219.103	10.2.219.103
105	10.2.219.104/32	10.2.219.104 – 10.2.219.104	10.2.219.104
106	10.2.219.105/32	10.2.219.105 – 10.2.219.105	10.2.219.105
107	10.2.219.106/32	10.2.219.106 – 10.2.219.106	10.2.219.106
108	10.2.219.107/32	10.2.219.107 – 10.2.219.107	10.2.219.107
109	10.2.219.108/32	10.2.219.108 – 10.2.219.108	10.2.219.108
110	10.2.219.109/32	10.2.219.109 – 10.2.219.109	10.2.219.109
111	10.2.219.110/32	10.2.219.110 – 10.2.219.110	10.2.219.110
112	10.2.219.111/32	10.2.219.111 – 10.2.219.111	10.2.219.111
113	10.2.219.112/32	10.2.219.112 – 10.2.219.112	10.2.219.112
114	10.2.219.113/32	10.2.219.113 – 10.2.219.113	10.2.219.113
115	10.2.219.114/32	10.2.219.114 – 10.2.219.114	10.2.219.114
116	10.2.219.115/32	10.2.219.115 – 10.2.219.115	10.2.219.115
117	10.2.219.116/32	10.2.219.116 – 10.2.219.116	10.2.219.116
118	10.2.219.117/32	10.2.219.117 – 10.2.219.117	10.2.219.117
119	10.2.219.118/32	10.2.219.118 – 10.2.219.118	10.2.219.118
120	10.2.219.119/32	10.2.219.119 – 10.2.219.119	10.2.219.119
121	10.2.219.120/32	10.2.219.120 – 10.2.219.120	10.2.219.120
122	10.2.219.121/32	10.2.219.121 – 10.2.219.121	10.2.219.121
123	10.2.219.122/32	10.2.219.122 – 10.2.219.122	10.2.219.122
124	10.2.219.123/32	10.2.219.123 – 10.2.219.123	10.2.219.123
125	10.2.219.124/32	10.2.219.124 – 10.2.219.124	10.2.219.124
126	10.2.219.125/32	10.2.219.125 – 10.2.219.125	10.2.219.125
127	10.2.219.126/32	10.2.219.126 – 10.2.219.126	10.2.219.126
128	10.2.219.127/32	10.2.219.127 – 10.2.219.127	10.2.219.127
129	10.2.219.128/32	10.2.219.128 – 10.2.219.128	10.2.219.128
130	10.2.219.129/32	10.2.219.129 – 10.2.219.129	10.2.219.129
131	10.2.219.130/32	10.2.219.130 – 10.2.219.130	10.2.219.130
132	10.2.219.131/32	10.2.219.131 – 10.2.219.131	10.2.219.131
133	10.2.219.132/32	10.2.219.132 – 10.2.219.132	10.2.219.132
134	10.2.219.133/32	10.2.219.133 – 10.2.219.133	10.2.219.133
135	10.2.219.134/32	10.2.219.134 – 10.2.219.134	10.2.219.134
136	10.2.219.135/32	10.2.219.135 – 10.2.219.135	10.2.219.135
137	10.2.219.136/32	10.2.219.136 – 10.2.219.136	10.2.219.136
138	10.2.219.137/32	10.2.219.137 – 10.2.219.137	10.2.219.137
139	10.2.219.138/32	10.2.219.138 – 10.2.219.138	10.2.219.138
140	10.2.219.139/32	10.2.219.139 – 10.2.219.139	10.2.219.139
141	10.2.219.140/32	10.2.219.140 – 10.2.219.140	10.2.219.140
142	10.2.219.141/32	10.2.219.141 – 10.2.219.141	10.2.219.141
143	10.2.219.142/32	10.2.219.142 – 10.2.219.142	10.2.219.142
144	10.2.219.143/32	10.2.219.143 – 10.2.219.143	10.2.219.143
145	10.2.219.144/32	10.2.219.144 – 10.2.219.144	10.2.219.144
146	10.2.219.145/32	10.2.219.145 – 10.2.219.145	10.2.219.145
147	10.2.219.146/32	10.2.219.146 – 10.2.219.146	10.2.219.146
148	10.2.219.147/32	10.2.219.147 – 10.2.219.147	10.2.219.147
149	10.2.219.148/32	10.2.219.148 – 10.2.219.148	10.2.219.148
150	10.2.219.149/32	10.2.219.149 – 10.2.219.149	10.2.219.149
151	10.2.219.150/32	10.2.219.150 – 10.2.219.150	10.2.219.150
152	10.2.219.151/32	10.2.219.151 – 10.2.219.151	10.2.219.151
153	10.2.219.152/32	10.2.219.152 – 10.2.219.152	10.2.219.152
154	10.2.219.153/32	10.2.219.153 – 10.2.219.153	10.2.219.153
155	10.2.219.154/32	10.2.219.154 – 10.2.219.154	10.2.219.154
156	10.2.219.155/32	10.2.219.155 – 10.2.219.155	10.2.219.155
157	10.2.219.156/32	10.2.219.156 – 10.2.219.156	10.2.219.156
158	10.2.219.157/32	10.2.219.157 – 10.2.219.157	10.2.219.157
159	10.2.219.158/32	10.2.219.158 – 10.2.219.158	10.2.219.158
160	10.2.219.159/32	10.2.219.159 – 10.2.219.159	10.2.219.159
161	10.2.219.160/32	10.2.219.160 – 10.2.219.160	10.2.219.160
162	10.2.219.161/32	10.2.219.161 – 10.2.219.161	10.2.219.161
163	10.2.219.162/32	10.2.219.162 – 10.2.219.162	10.2.219.162
164	10.2.219.163/32	10.2.219.163 – 10.2.219.163	10.2.219.163
165	10.2.219.164/32	10.2.219.164 – 10.2.219.164	10.2.219.164
166	10.2.219.165/32	10.2.219.165 – 10.2.219.165	10.2.219.165
167	10.2.219.166/32	10.2.219.166 – 10.2.219.166	10.2.219.166
168	10.2.219.167/32	10.2.219.167 – 10.2.219.167	10.2.219.167
169	10.2.219.168/32	10.2.219.168 – 10.2.219.168	10.2.219.168
170	10.2.219.169/32	10.2.219.169 – 10.2.219.169	10.2.219.169
171	10.2.219.170/32	10.2.219.170 – 10.2.219.170	10.2.219.170
172	10.2.219.171/32	10.2.219.171 – 10.2.219.171	10.2.219.171
173	10.2.219.172/32	10.2.219.172 – 10.2.219.172	10.2.219.172
174	10.2.219.173/32	10.2.219.173 – 10.2.219.173	10.2.219.173
175	10.2.219.174/32	10.2.219.174 – 10.2.219.174	10.2.219.174
176	10.2.219.175/32	10.2.219.175 – 10.2.219.175	10.2.219.175
177	10.2.219.176/32	10.2.219.176 – 10.2.219.176	10.2.219.176
178	10.2.219.177/32	10.2.219.177 – 10.2.219.177	10.2.219.177
179	10.2.219.178/32	10.2.219.178 – 10.2.219.178	10.2.219.178
180	10.2.219.179/32	10.2.219.179 – 10.2.219.179	10.2.219.179
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190	10.2.219.189/32	10.2.219.189 – 10.2.219.189	10.2.219.189
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199	10.2.219.198/32	10.2.219.198 – 10.2.219.198	10.2.219.198
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201	10.2.219.200/32	10.2.219.200 – 10.2.219.200	10.2.219.200
202	10.2.219.201/32	10.2.219.201 – 10.2.219.201	10.2.219.201
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205	10.2.219.204/32	10.2.219.204 – 10.2.219.204	10.2.219.204
206	10.2.219.205/32	10.2.219.205 – 10.2.219.205	10.2.219.205
207	10.2.219.206/32	10.2.219.206 – 10.2.219.206	10.2.219.206
208	10.2.219.207/32	10.2.219.207 – 10.2.219.207	10.2.219.207
209	10.2.219.208/32	10.2.219.208 – 10.2.219.208	10.2.219.208
210	10.2.219.209/32	10.2.219.209 – 10.2.219.209	10.2.219.209
211	10.2.219.210/32	10.2.219.210 – 10.2.219.210	10.2.219.210
212	10.2.219.211/32	10.2.219.211 – 10.2.219.211	10.2.219.211
213	10.2.219.212/32	10.2.219.212 – 10.2.219.212	10.2.219.212
214	10.2.219.213/32	10.2.219.213 – 10.2.219.213	10.2.219.213
215	10.2.219.214/32	10.2.219.214 – 10.2.219.214	10.2.219.214
216	10.2.219.215/32	10.2.219.215 – 10.2.219.215	10.2.219.215
217	10.2.219.216/32	10.2.219.216 – 10.2.219.216	10.2.219.216
218	10.2.219.217/32	10.2.219.217 – 10.2.219.217	10.2.219.217
219	10.2.219.218/32	10.2.219.218 – 10.2.219.218	10.2.219.218
220	10.2.219.219/32	10.2.219.219 – 10.2.219.219	10.2.219.219
221	10.2.219.220/32	10.2.219.220 – 10.2.219.220	10.2.219.220
222	10.2.219.221/32	10.2.219.221 – 10.2.219.221	10.2.219.221
223	10.2.219.222/32	10.2.219.222 – 10.2.219.222	10.2.219.222
224	10.2.219.223/32	10.2.219.223 – 10.2.219.223	10.2.219.223
225	10.2.219.224/32	10.2.219.224 – 10.2.219.224	10.2.219.224
226	10.2.219.225/32	10.2.219.225 – 10.2.219.225	10.2.219.225
227	10.2.219.226/32	10.2.219.226 – 10.2.219.226	10.2.219.226
228	10.2.219.227/32	10.2.219.227 – 10.2.219.227	10.2.219.227
229	10.2.219.228/32	10.2.219.228 – 10.2.219.228	10.2.219.228
230	10.2.219.229/32	10.2.219.229 – 10.2.219.229	10.2.219.229
231	10.2.219.230/32	10.2.219.230 – 10.2.219.230	10.2.219.230
232	10.2.219.231/32	10.2.219.231 – 10.2.219.231	10.2.219.231
233	10.2.219.232/32	10.2.219.232 – 10.2.219.232	10.2.219.232
234	10.2.219.233/32	10.2.219.233 – 10.2.219.233	10.2.219.233
235	10.2.219.234/32	10.2.219.234 – 10.2.219.234	10.2.219.234
236	10.2.219.235/32	10.2.219.235 – 10.2.219.235	10.2.219.235
237	10.2.219.236/32	10.2.219.236 – 10.2.219.236	10.2.219.236
238	10.2.219.237/32	10.2.219.237 – 10.2.219.237	10.2.219.237
239	10.2.219.238/32	10.2.219.238 – 10.2.219.238	10.2.219.238
240	10.2.219.239/32	10.2.219.239 – 10.2.219.239	10.2.219.239
241	10.2.219.240/32	10.2.219.240 – 10.2.219.240	10.2.219.240
242	10.2.219.241/32	10.2.219.241 – 10.2.219.241	10.2.219.241
243	10.2.219.242/32	10.2.219.242 – 10.2.219.242	10.2.219.242
244	10.2.219.243/32	10.2.219.243 – 10.2.219.243	10.2.219.243
245	10.2.219.244/32	10.2.219.244 – 10.2.219.244	10.2.219.244
246	10.2.219.245/32	10.2.219.245 – 10.2.219.245	10.2.219.245
247	10.2.219.246/32	10.2.219.246 – 10.2.219.246	10.2.219.246
248	10.2.219.247/32	10.2.219.247 – 10.2.219.247	10.2.219.247
249	10.2.219.248/32	10.2.219.248 – 10.2.219.248	10.2.219.248
250	10.2.219.249/32	10.2.219.249 – 10.2.219.249	10.2.219.249
251	10.2.219.250/32	10.2.219.250 – 10.2.219.250	10.2.219.250
252	10.2.219.251/32	10.2.219.251 – 10.2.219.251	10.2.219.251
253	10.2.219.252/32	10.2.219.252 – 10.2.219.252	10.2.219.252
254	10.2.219.253/32	10.2.219.253 – 10.2.219.253	10.2.219.253
255	10.2.219.254/32	10.2.219.254 – 10.2.219.254	10.2.219.254
256	10.2.219.255/32	10.2.219.255 – 10.2.219.255	10.2.219.255

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 →