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)10.7.224.0/21

network10.7.224.0/21

broadcast10.7.231.255

first host10.7.224.1

last host10.7.231.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.7.224.0/21

address00001010.00000111.11100000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000111.11100000.00000000

broadcast00001010.00000111.11100111.11111111

green = network part, grey = host part

hex0x0a07e000

decimal168288256

reverse dns0.224.7.10.in-addr.arpa

ipv4-mapped::ffff:a07:e000

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.7.224.0/32	10.7.224.0 – 10.7.224.0	10.7.224.0
2	10.7.224.1/32	10.7.224.1 – 10.7.224.1	10.7.224.1
3	10.7.224.2/32	10.7.224.2 – 10.7.224.2	10.7.224.2
4	10.7.224.3/32	10.7.224.3 – 10.7.224.3	10.7.224.3
5	10.7.224.4/32	10.7.224.4 – 10.7.224.4	10.7.224.4
6	10.7.224.5/32	10.7.224.5 – 10.7.224.5	10.7.224.5
7	10.7.224.6/32	10.7.224.6 – 10.7.224.6	10.7.224.6
8	10.7.224.7/32	10.7.224.7 – 10.7.224.7	10.7.224.7
9	10.7.224.8/32	10.7.224.8 – 10.7.224.8	10.7.224.8
10	10.7.224.9/32	10.7.224.9 – 10.7.224.9	10.7.224.9
11	10.7.224.10/32	10.7.224.10 – 10.7.224.10	10.7.224.10
12	10.7.224.11/32	10.7.224.11 – 10.7.224.11	10.7.224.11
13	10.7.224.12/32	10.7.224.12 – 10.7.224.12	10.7.224.12
14	10.7.224.13/32	10.7.224.13 – 10.7.224.13	10.7.224.13
15	10.7.224.14/32	10.7.224.14 – 10.7.224.14	10.7.224.14
16	10.7.224.15/32	10.7.224.15 – 10.7.224.15	10.7.224.15
17	10.7.224.16/32	10.7.224.16 – 10.7.224.16	10.7.224.16
18	10.7.224.17/32	10.7.224.17 – 10.7.224.17	10.7.224.17
19	10.7.224.18/32	10.7.224.18 – 10.7.224.18	10.7.224.18
20	10.7.224.19/32	10.7.224.19 – 10.7.224.19	10.7.224.19
21	10.7.224.20/32	10.7.224.20 – 10.7.224.20	10.7.224.20
22	10.7.224.21/32	10.7.224.21 – 10.7.224.21	10.7.224.21
23	10.7.224.22/32	10.7.224.22 – 10.7.224.22	10.7.224.22
24	10.7.224.23/32	10.7.224.23 – 10.7.224.23	10.7.224.23
25	10.7.224.24/32	10.7.224.24 – 10.7.224.24	10.7.224.24
26	10.7.224.25/32	10.7.224.25 – 10.7.224.25	10.7.224.25
27	10.7.224.26/32	10.7.224.26 – 10.7.224.26	10.7.224.26
28	10.7.224.27/32	10.7.224.27 – 10.7.224.27	10.7.224.27
29	10.7.224.28/32	10.7.224.28 – 10.7.224.28	10.7.224.28
30	10.7.224.29/32	10.7.224.29 – 10.7.224.29	10.7.224.29
31	10.7.224.30/32	10.7.224.30 – 10.7.224.30	10.7.224.30
32	10.7.224.31/32	10.7.224.31 – 10.7.224.31	10.7.224.31
33	10.7.224.32/32	10.7.224.32 – 10.7.224.32	10.7.224.32
34	10.7.224.33/32	10.7.224.33 – 10.7.224.33	10.7.224.33
35	10.7.224.34/32	10.7.224.34 – 10.7.224.34	10.7.224.34
36	10.7.224.35/32	10.7.224.35 – 10.7.224.35	10.7.224.35
37	10.7.224.36/32	10.7.224.36 – 10.7.224.36	10.7.224.36
38	10.7.224.37/32	10.7.224.37 – 10.7.224.37	10.7.224.37
39	10.7.224.38/32	10.7.224.38 – 10.7.224.38	10.7.224.38
40	10.7.224.39/32	10.7.224.39 – 10.7.224.39	10.7.224.39
41	10.7.224.40/32	10.7.224.40 – 10.7.224.40	10.7.224.40
42	10.7.224.41/32	10.7.224.41 – 10.7.224.41	10.7.224.41
43	10.7.224.42/32	10.7.224.42 – 10.7.224.42	10.7.224.42
44	10.7.224.43/32	10.7.224.43 – 10.7.224.43	10.7.224.43
45	10.7.224.44/32	10.7.224.44 – 10.7.224.44	10.7.224.44
46	10.7.224.45/32	10.7.224.45 – 10.7.224.45	10.7.224.45
47	10.7.224.46/32	10.7.224.46 – 10.7.224.46	10.7.224.46
48	10.7.224.47/32	10.7.224.47 – 10.7.224.47	10.7.224.47
49	10.7.224.48/32	10.7.224.48 – 10.7.224.48	10.7.224.48
50	10.7.224.49/32	10.7.224.49 – 10.7.224.49	10.7.224.49
51	10.7.224.50/32	10.7.224.50 – 10.7.224.50	10.7.224.50
52	10.7.224.51/32	10.7.224.51 – 10.7.224.51	10.7.224.51
53	10.7.224.52/32	10.7.224.52 – 10.7.224.52	10.7.224.52
54	10.7.224.53/32	10.7.224.53 – 10.7.224.53	10.7.224.53
55	10.7.224.54/32	10.7.224.54 – 10.7.224.54	10.7.224.54
56	10.7.224.55/32	10.7.224.55 – 10.7.224.55	10.7.224.55
57	10.7.224.56/32	10.7.224.56 – 10.7.224.56	10.7.224.56
58	10.7.224.57/32	10.7.224.57 – 10.7.224.57	10.7.224.57
59	10.7.224.58/32	10.7.224.58 – 10.7.224.58	10.7.224.58
60	10.7.224.59/32	10.7.224.59 – 10.7.224.59	10.7.224.59
61	10.7.224.60/32	10.7.224.60 – 10.7.224.60	10.7.224.60
62	10.7.224.61/32	10.7.224.61 – 10.7.224.61	10.7.224.61
63	10.7.224.62/32	10.7.224.62 – 10.7.224.62	10.7.224.62
64	10.7.224.63/32	10.7.224.63 – 10.7.224.63	10.7.224.63
65	10.7.224.64/32	10.7.224.64 – 10.7.224.64	10.7.224.64
66	10.7.224.65/32	10.7.224.65 – 10.7.224.65	10.7.224.65
67	10.7.224.66/32	10.7.224.66 – 10.7.224.66	10.7.224.66
68	10.7.224.67/32	10.7.224.67 – 10.7.224.67	10.7.224.67
69	10.7.224.68/32	10.7.224.68 – 10.7.224.68	10.7.224.68
70	10.7.224.69/32	10.7.224.69 – 10.7.224.69	10.7.224.69
71	10.7.224.70/32	10.7.224.70 – 10.7.224.70	10.7.224.70
72	10.7.224.71/32	10.7.224.71 – 10.7.224.71	10.7.224.71
73	10.7.224.72/32	10.7.224.72 – 10.7.224.72	10.7.224.72
74	10.7.224.73/32	10.7.224.73 – 10.7.224.73	10.7.224.73
75	10.7.224.74/32	10.7.224.74 – 10.7.224.74	10.7.224.74
76	10.7.224.75/32	10.7.224.75 – 10.7.224.75	10.7.224.75
77	10.7.224.76/32	10.7.224.76 – 10.7.224.76	10.7.224.76
78	10.7.224.77/32	10.7.224.77 – 10.7.224.77	10.7.224.77
79	10.7.224.78/32	10.7.224.78 – 10.7.224.78	10.7.224.78
80	10.7.224.79/32	10.7.224.79 – 10.7.224.79	10.7.224.79
81	10.7.224.80/32	10.7.224.80 – 10.7.224.80	10.7.224.80
82	10.7.224.81/32	10.7.224.81 – 10.7.224.81	10.7.224.81
83	10.7.224.82/32	10.7.224.82 – 10.7.224.82	10.7.224.82
84	10.7.224.83/32	10.7.224.83 – 10.7.224.83	10.7.224.83
85	10.7.224.84/32	10.7.224.84 – 10.7.224.84	10.7.224.84
86	10.7.224.85/32	10.7.224.85 – 10.7.224.85	10.7.224.85
87	10.7.224.86/32	10.7.224.86 – 10.7.224.86	10.7.224.86
88	10.7.224.87/32	10.7.224.87 – 10.7.224.87	10.7.224.87
89	10.7.224.88/32	10.7.224.88 – 10.7.224.88	10.7.224.88
90	10.7.224.89/32	10.7.224.89 – 10.7.224.89	10.7.224.89
91	10.7.224.90/32	10.7.224.90 – 10.7.224.90	10.7.224.90
92	10.7.224.91/32	10.7.224.91 – 10.7.224.91	10.7.224.91
93	10.7.224.92/32	10.7.224.92 – 10.7.224.92	10.7.224.92
94	10.7.224.93/32	10.7.224.93 – 10.7.224.93	10.7.224.93
95	10.7.224.94/32	10.7.224.94 – 10.7.224.94	10.7.224.94
96	10.7.224.95/32	10.7.224.95 – 10.7.224.95	10.7.224.95
97	10.7.224.96/32	10.7.224.96 – 10.7.224.96	10.7.224.96
98	10.7.224.97/32	10.7.224.97 – 10.7.224.97	10.7.224.97
99	10.7.224.98/32	10.7.224.98 – 10.7.224.98	10.7.224.98
100	10.7.224.99/32	10.7.224.99 – 10.7.224.99	10.7.224.99
101	10.7.224.100/32	10.7.224.100 – 10.7.224.100	10.7.224.100
102	10.7.224.101/32	10.7.224.101 – 10.7.224.101	10.7.224.101
103	10.7.224.102/32	10.7.224.102 – 10.7.224.102	10.7.224.102
104	10.7.224.103/32	10.7.224.103 – 10.7.224.103	10.7.224.103
105	10.7.224.104/32	10.7.224.104 – 10.7.224.104	10.7.224.104
106	10.7.224.105/32	10.7.224.105 – 10.7.224.105	10.7.224.105
107	10.7.224.106/32	10.7.224.106 – 10.7.224.106	10.7.224.106
108	10.7.224.107/32	10.7.224.107 – 10.7.224.107	10.7.224.107
109	10.7.224.108/32	10.7.224.108 – 10.7.224.108	10.7.224.108
110	10.7.224.109/32	10.7.224.109 – 10.7.224.109	10.7.224.109
111	10.7.224.110/32	10.7.224.110 – 10.7.224.110	10.7.224.110
112	10.7.224.111/32	10.7.224.111 – 10.7.224.111	10.7.224.111
113	10.7.224.112/32	10.7.224.112 – 10.7.224.112	10.7.224.112
114	10.7.224.113/32	10.7.224.113 – 10.7.224.113	10.7.224.113
115	10.7.224.114/32	10.7.224.114 – 10.7.224.114	10.7.224.114
116	10.7.224.115/32	10.7.224.115 – 10.7.224.115	10.7.224.115
117	10.7.224.116/32	10.7.224.116 – 10.7.224.116	10.7.224.116
118	10.7.224.117/32	10.7.224.117 – 10.7.224.117	10.7.224.117
119	10.7.224.118/32	10.7.224.118 – 10.7.224.118	10.7.224.118
120	10.7.224.119/32	10.7.224.119 – 10.7.224.119	10.7.224.119
121	10.7.224.120/32	10.7.224.120 – 10.7.224.120	10.7.224.120
122	10.7.224.121/32	10.7.224.121 – 10.7.224.121	10.7.224.121
123	10.7.224.122/32	10.7.224.122 – 10.7.224.122	10.7.224.122
124	10.7.224.123/32	10.7.224.123 – 10.7.224.123	10.7.224.123
125	10.7.224.124/32	10.7.224.124 – 10.7.224.124	10.7.224.124
126	10.7.224.125/32	10.7.224.125 – 10.7.224.125	10.7.224.125
127	10.7.224.126/32	10.7.224.126 – 10.7.224.126	10.7.224.126
128	10.7.224.127/32	10.7.224.127 – 10.7.224.127	10.7.224.127
129	10.7.224.128/32	10.7.224.128 – 10.7.224.128	10.7.224.128
130	10.7.224.129/32	10.7.224.129 – 10.7.224.129	10.7.224.129
131	10.7.224.130/32	10.7.224.130 – 10.7.224.130	10.7.224.130
132	10.7.224.131/32	10.7.224.131 – 10.7.224.131	10.7.224.131
133	10.7.224.132/32	10.7.224.132 – 10.7.224.132	10.7.224.132
134	10.7.224.133/32	10.7.224.133 – 10.7.224.133	10.7.224.133
135	10.7.224.134/32	10.7.224.134 – 10.7.224.134	10.7.224.134
136	10.7.224.135/32	10.7.224.135 – 10.7.224.135	10.7.224.135
137	10.7.224.136/32	10.7.224.136 – 10.7.224.136	10.7.224.136
138	10.7.224.137/32	10.7.224.137 – 10.7.224.137	10.7.224.137
139	10.7.224.138/32	10.7.224.138 – 10.7.224.138	10.7.224.138
140	10.7.224.139/32	10.7.224.139 – 10.7.224.139	10.7.224.139
141	10.7.224.140/32	10.7.224.140 – 10.7.224.140	10.7.224.140
142	10.7.224.141/32	10.7.224.141 – 10.7.224.141	10.7.224.141
143	10.7.224.142/32	10.7.224.142 – 10.7.224.142	10.7.224.142
144	10.7.224.143/32	10.7.224.143 – 10.7.224.143	10.7.224.143
145	10.7.224.144/32	10.7.224.144 – 10.7.224.144	10.7.224.144
146	10.7.224.145/32	10.7.224.145 – 10.7.224.145	10.7.224.145
147	10.7.224.146/32	10.7.224.146 – 10.7.224.146	10.7.224.146
148	10.7.224.147/32	10.7.224.147 – 10.7.224.147	10.7.224.147
149	10.7.224.148/32	10.7.224.148 – 10.7.224.148	10.7.224.148
150	10.7.224.149/32	10.7.224.149 – 10.7.224.149	10.7.224.149
151	10.7.224.150/32	10.7.224.150 – 10.7.224.150	10.7.224.150
152	10.7.224.151/32	10.7.224.151 – 10.7.224.151	10.7.224.151
153	10.7.224.152/32	10.7.224.152 – 10.7.224.152	10.7.224.152
154	10.7.224.153/32	10.7.224.153 – 10.7.224.153	10.7.224.153
155	10.7.224.154/32	10.7.224.154 – 10.7.224.154	10.7.224.154
156	10.7.224.155/32	10.7.224.155 – 10.7.224.155	10.7.224.155
157	10.7.224.156/32	10.7.224.156 – 10.7.224.156	10.7.224.156
158	10.7.224.157/32	10.7.224.157 – 10.7.224.157	10.7.224.157
159	10.7.224.158/32	10.7.224.158 – 10.7.224.158	10.7.224.158
160	10.7.224.159/32	10.7.224.159 – 10.7.224.159	10.7.224.159
161	10.7.224.160/32	10.7.224.160 – 10.7.224.160	10.7.224.160
162	10.7.224.161/32	10.7.224.161 – 10.7.224.161	10.7.224.161
163	10.7.224.162/32	10.7.224.162 – 10.7.224.162	10.7.224.162
164	10.7.224.163/32	10.7.224.163 – 10.7.224.163	10.7.224.163
165	10.7.224.164/32	10.7.224.164 – 10.7.224.164	10.7.224.164
166	10.7.224.165/32	10.7.224.165 – 10.7.224.165	10.7.224.165
167	10.7.224.166/32	10.7.224.166 – 10.7.224.166	10.7.224.166
168	10.7.224.167/32	10.7.224.167 – 10.7.224.167	10.7.224.167
169	10.7.224.168/32	10.7.224.168 – 10.7.224.168	10.7.224.168
170	10.7.224.169/32	10.7.224.169 – 10.7.224.169	10.7.224.169
171	10.7.224.170/32	10.7.224.170 – 10.7.224.170	10.7.224.170
172	10.7.224.171/32	10.7.224.171 – 10.7.224.171	10.7.224.171
173	10.7.224.172/32	10.7.224.172 – 10.7.224.172	10.7.224.172
174	10.7.224.173/32	10.7.224.173 – 10.7.224.173	10.7.224.173
175	10.7.224.174/32	10.7.224.174 – 10.7.224.174	10.7.224.174
176	10.7.224.175/32	10.7.224.175 – 10.7.224.175	10.7.224.175
177	10.7.224.176/32	10.7.224.176 – 10.7.224.176	10.7.224.176
178	10.7.224.177/32	10.7.224.177 – 10.7.224.177	10.7.224.177
179	10.7.224.178/32	10.7.224.178 – 10.7.224.178	10.7.224.178
180	10.7.224.179/32	10.7.224.179 – 10.7.224.179	10.7.224.179
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198	10.7.224.197/32	10.7.224.197 – 10.7.224.197	10.7.224.197
199	10.7.224.198/32	10.7.224.198 – 10.7.224.198	10.7.224.198
200	10.7.224.199/32	10.7.224.199 – 10.7.224.199	10.7.224.199
201	10.7.224.200/32	10.7.224.200 – 10.7.224.200	10.7.224.200
202	10.7.224.201/32	10.7.224.201 – 10.7.224.201	10.7.224.201
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207	10.7.224.206/32	10.7.224.206 – 10.7.224.206	10.7.224.206
208	10.7.224.207/32	10.7.224.207 – 10.7.224.207	10.7.224.207
209	10.7.224.208/32	10.7.224.208 – 10.7.224.208	10.7.224.208
210	10.7.224.209/32	10.7.224.209 – 10.7.224.209	10.7.224.209
211	10.7.224.210/32	10.7.224.210 – 10.7.224.210	10.7.224.210
212	10.7.224.211/32	10.7.224.211 – 10.7.224.211	10.7.224.211
213	10.7.224.212/32	10.7.224.212 – 10.7.224.212	10.7.224.212
214	10.7.224.213/32	10.7.224.213 – 10.7.224.213	10.7.224.213
215	10.7.224.214/32	10.7.224.214 – 10.7.224.214	10.7.224.214
216	10.7.224.215/32	10.7.224.215 – 10.7.224.215	10.7.224.215
217	10.7.224.216/32	10.7.224.216 – 10.7.224.216	10.7.224.216
218	10.7.224.217/32	10.7.224.217 – 10.7.224.217	10.7.224.217
219	10.7.224.218/32	10.7.224.218 – 10.7.224.218	10.7.224.218
220	10.7.224.219/32	10.7.224.219 – 10.7.224.219	10.7.224.219
221	10.7.224.220/32	10.7.224.220 – 10.7.224.220	10.7.224.220
222	10.7.224.221/32	10.7.224.221 – 10.7.224.221	10.7.224.221
223	10.7.224.222/32	10.7.224.222 – 10.7.224.222	10.7.224.222
224	10.7.224.223/32	10.7.224.223 – 10.7.224.223	10.7.224.223
225	10.7.224.224/32	10.7.224.224 – 10.7.224.224	10.7.224.224
226	10.7.224.225/32	10.7.224.225 – 10.7.224.225	10.7.224.225
227	10.7.224.226/32	10.7.224.226 – 10.7.224.226	10.7.224.226
228	10.7.224.227/32	10.7.224.227 – 10.7.224.227	10.7.224.227
229	10.7.224.228/32	10.7.224.228 – 10.7.224.228	10.7.224.228
230	10.7.224.229/32	10.7.224.229 – 10.7.224.229	10.7.224.229
231	10.7.224.230/32	10.7.224.230 – 10.7.224.230	10.7.224.230
232	10.7.224.231/32	10.7.224.231 – 10.7.224.231	10.7.224.231
233	10.7.224.232/32	10.7.224.232 – 10.7.224.232	10.7.224.232
234	10.7.224.233/32	10.7.224.233 – 10.7.224.233	10.7.224.233
235	10.7.224.234/32	10.7.224.234 – 10.7.224.234	10.7.224.234
236	10.7.224.235/32	10.7.224.235 – 10.7.224.235	10.7.224.235
237	10.7.224.236/32	10.7.224.236 – 10.7.224.236	10.7.224.236
238	10.7.224.237/32	10.7.224.237 – 10.7.224.237	10.7.224.237
239	10.7.224.238/32	10.7.224.238 – 10.7.224.238	10.7.224.238
240	10.7.224.239/32	10.7.224.239 – 10.7.224.239	10.7.224.239
241	10.7.224.240/32	10.7.224.240 – 10.7.224.240	10.7.224.240
242	10.7.224.241/32	10.7.224.241 – 10.7.224.241	10.7.224.241
243	10.7.224.242/32	10.7.224.242 – 10.7.224.242	10.7.224.242
244	10.7.224.243/32	10.7.224.243 – 10.7.224.243	10.7.224.243
245	10.7.224.244/32	10.7.224.244 – 10.7.224.244	10.7.224.244
246	10.7.224.245/32	10.7.224.245 – 10.7.224.245	10.7.224.245
247	10.7.224.246/32	10.7.224.246 – 10.7.224.246	10.7.224.246
248	10.7.224.247/32	10.7.224.247 – 10.7.224.247	10.7.224.247
249	10.7.224.248/32	10.7.224.248 – 10.7.224.248	10.7.224.248
250	10.7.224.249/32	10.7.224.249 – 10.7.224.249	10.7.224.249
251	10.7.224.250/32	10.7.224.250 – 10.7.224.250	10.7.224.250
252	10.7.224.251/32	10.7.224.251 – 10.7.224.251	10.7.224.251
253	10.7.224.252/32	10.7.224.252 – 10.7.224.252	10.7.224.252
254	10.7.224.253/32	10.7.224.253 – 10.7.224.253	10.7.224.253
255	10.7.224.254/32	10.7.224.254 – 10.7.224.254	10.7.224.254
256	10.7.224.255/32	10.7.224.255 – 10.7.224.255	10.7.224.255

showing 256 of 2,048

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 /21
/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	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →