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)10.0.57.0/24

network10.0.57.0/24

broadcast10.0.57.255

first host10.0.57.1

last host10.0.57.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.57.0/24

address00001010.00000000.00111001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00111001.00000000

broadcast00001010.00000000.00111001.11111111

green = network part, grey = host part

hex0x0a003900

decimal167786752

reverse dns0.57.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:3900

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.57.0/32	10.0.57.0 – 10.0.57.0	10.0.57.0
2	10.0.57.1/32	10.0.57.1 – 10.0.57.1	10.0.57.1
3	10.0.57.2/32	10.0.57.2 – 10.0.57.2	10.0.57.2
4	10.0.57.3/32	10.0.57.3 – 10.0.57.3	10.0.57.3
5	10.0.57.4/32	10.0.57.4 – 10.0.57.4	10.0.57.4
6	10.0.57.5/32	10.0.57.5 – 10.0.57.5	10.0.57.5
7	10.0.57.6/32	10.0.57.6 – 10.0.57.6	10.0.57.6
8	10.0.57.7/32	10.0.57.7 – 10.0.57.7	10.0.57.7
9	10.0.57.8/32	10.0.57.8 – 10.0.57.8	10.0.57.8
10	10.0.57.9/32	10.0.57.9 – 10.0.57.9	10.0.57.9
11	10.0.57.10/32	10.0.57.10 – 10.0.57.10	10.0.57.10
12	10.0.57.11/32	10.0.57.11 – 10.0.57.11	10.0.57.11
13	10.0.57.12/32	10.0.57.12 – 10.0.57.12	10.0.57.12
14	10.0.57.13/32	10.0.57.13 – 10.0.57.13	10.0.57.13
15	10.0.57.14/32	10.0.57.14 – 10.0.57.14	10.0.57.14
16	10.0.57.15/32	10.0.57.15 – 10.0.57.15	10.0.57.15
17	10.0.57.16/32	10.0.57.16 – 10.0.57.16	10.0.57.16
18	10.0.57.17/32	10.0.57.17 – 10.0.57.17	10.0.57.17
19	10.0.57.18/32	10.0.57.18 – 10.0.57.18	10.0.57.18
20	10.0.57.19/32	10.0.57.19 – 10.0.57.19	10.0.57.19
21	10.0.57.20/32	10.0.57.20 – 10.0.57.20	10.0.57.20
22	10.0.57.21/32	10.0.57.21 – 10.0.57.21	10.0.57.21
23	10.0.57.22/32	10.0.57.22 – 10.0.57.22	10.0.57.22
24	10.0.57.23/32	10.0.57.23 – 10.0.57.23	10.0.57.23
25	10.0.57.24/32	10.0.57.24 – 10.0.57.24	10.0.57.24
26	10.0.57.25/32	10.0.57.25 – 10.0.57.25	10.0.57.25
27	10.0.57.26/32	10.0.57.26 – 10.0.57.26	10.0.57.26
28	10.0.57.27/32	10.0.57.27 – 10.0.57.27	10.0.57.27
29	10.0.57.28/32	10.0.57.28 – 10.0.57.28	10.0.57.28
30	10.0.57.29/32	10.0.57.29 – 10.0.57.29	10.0.57.29
31	10.0.57.30/32	10.0.57.30 – 10.0.57.30	10.0.57.30
32	10.0.57.31/32	10.0.57.31 – 10.0.57.31	10.0.57.31
33	10.0.57.32/32	10.0.57.32 – 10.0.57.32	10.0.57.32
34	10.0.57.33/32	10.0.57.33 – 10.0.57.33	10.0.57.33
35	10.0.57.34/32	10.0.57.34 – 10.0.57.34	10.0.57.34
36	10.0.57.35/32	10.0.57.35 – 10.0.57.35	10.0.57.35
37	10.0.57.36/32	10.0.57.36 – 10.0.57.36	10.0.57.36
38	10.0.57.37/32	10.0.57.37 – 10.0.57.37	10.0.57.37
39	10.0.57.38/32	10.0.57.38 – 10.0.57.38	10.0.57.38
40	10.0.57.39/32	10.0.57.39 – 10.0.57.39	10.0.57.39
41	10.0.57.40/32	10.0.57.40 – 10.0.57.40	10.0.57.40
42	10.0.57.41/32	10.0.57.41 – 10.0.57.41	10.0.57.41
43	10.0.57.42/32	10.0.57.42 – 10.0.57.42	10.0.57.42
44	10.0.57.43/32	10.0.57.43 – 10.0.57.43	10.0.57.43
45	10.0.57.44/32	10.0.57.44 – 10.0.57.44	10.0.57.44
46	10.0.57.45/32	10.0.57.45 – 10.0.57.45	10.0.57.45
47	10.0.57.46/32	10.0.57.46 – 10.0.57.46	10.0.57.46
48	10.0.57.47/32	10.0.57.47 – 10.0.57.47	10.0.57.47
49	10.0.57.48/32	10.0.57.48 – 10.0.57.48	10.0.57.48
50	10.0.57.49/32	10.0.57.49 – 10.0.57.49	10.0.57.49
51	10.0.57.50/32	10.0.57.50 – 10.0.57.50	10.0.57.50
52	10.0.57.51/32	10.0.57.51 – 10.0.57.51	10.0.57.51
53	10.0.57.52/32	10.0.57.52 – 10.0.57.52	10.0.57.52
54	10.0.57.53/32	10.0.57.53 – 10.0.57.53	10.0.57.53
55	10.0.57.54/32	10.0.57.54 – 10.0.57.54	10.0.57.54
56	10.0.57.55/32	10.0.57.55 – 10.0.57.55	10.0.57.55
57	10.0.57.56/32	10.0.57.56 – 10.0.57.56	10.0.57.56
58	10.0.57.57/32	10.0.57.57 – 10.0.57.57	10.0.57.57
59	10.0.57.58/32	10.0.57.58 – 10.0.57.58	10.0.57.58
60	10.0.57.59/32	10.0.57.59 – 10.0.57.59	10.0.57.59
61	10.0.57.60/32	10.0.57.60 – 10.0.57.60	10.0.57.60
62	10.0.57.61/32	10.0.57.61 – 10.0.57.61	10.0.57.61
63	10.0.57.62/32	10.0.57.62 – 10.0.57.62	10.0.57.62
64	10.0.57.63/32	10.0.57.63 – 10.0.57.63	10.0.57.63
65	10.0.57.64/32	10.0.57.64 – 10.0.57.64	10.0.57.64
66	10.0.57.65/32	10.0.57.65 – 10.0.57.65	10.0.57.65
67	10.0.57.66/32	10.0.57.66 – 10.0.57.66	10.0.57.66
68	10.0.57.67/32	10.0.57.67 – 10.0.57.67	10.0.57.67
69	10.0.57.68/32	10.0.57.68 – 10.0.57.68	10.0.57.68
70	10.0.57.69/32	10.0.57.69 – 10.0.57.69	10.0.57.69
71	10.0.57.70/32	10.0.57.70 – 10.0.57.70	10.0.57.70
72	10.0.57.71/32	10.0.57.71 – 10.0.57.71	10.0.57.71
73	10.0.57.72/32	10.0.57.72 – 10.0.57.72	10.0.57.72
74	10.0.57.73/32	10.0.57.73 – 10.0.57.73	10.0.57.73
75	10.0.57.74/32	10.0.57.74 – 10.0.57.74	10.0.57.74
76	10.0.57.75/32	10.0.57.75 – 10.0.57.75	10.0.57.75
77	10.0.57.76/32	10.0.57.76 – 10.0.57.76	10.0.57.76
78	10.0.57.77/32	10.0.57.77 – 10.0.57.77	10.0.57.77
79	10.0.57.78/32	10.0.57.78 – 10.0.57.78	10.0.57.78
80	10.0.57.79/32	10.0.57.79 – 10.0.57.79	10.0.57.79
81	10.0.57.80/32	10.0.57.80 – 10.0.57.80	10.0.57.80
82	10.0.57.81/32	10.0.57.81 – 10.0.57.81	10.0.57.81
83	10.0.57.82/32	10.0.57.82 – 10.0.57.82	10.0.57.82
84	10.0.57.83/32	10.0.57.83 – 10.0.57.83	10.0.57.83
85	10.0.57.84/32	10.0.57.84 – 10.0.57.84	10.0.57.84
86	10.0.57.85/32	10.0.57.85 – 10.0.57.85	10.0.57.85
87	10.0.57.86/32	10.0.57.86 – 10.0.57.86	10.0.57.86
88	10.0.57.87/32	10.0.57.87 – 10.0.57.87	10.0.57.87
89	10.0.57.88/32	10.0.57.88 – 10.0.57.88	10.0.57.88
90	10.0.57.89/32	10.0.57.89 – 10.0.57.89	10.0.57.89
91	10.0.57.90/32	10.0.57.90 – 10.0.57.90	10.0.57.90
92	10.0.57.91/32	10.0.57.91 – 10.0.57.91	10.0.57.91
93	10.0.57.92/32	10.0.57.92 – 10.0.57.92	10.0.57.92
94	10.0.57.93/32	10.0.57.93 – 10.0.57.93	10.0.57.93
95	10.0.57.94/32	10.0.57.94 – 10.0.57.94	10.0.57.94
96	10.0.57.95/32	10.0.57.95 – 10.0.57.95	10.0.57.95
97	10.0.57.96/32	10.0.57.96 – 10.0.57.96	10.0.57.96
98	10.0.57.97/32	10.0.57.97 – 10.0.57.97	10.0.57.97
99	10.0.57.98/32	10.0.57.98 – 10.0.57.98	10.0.57.98
100	10.0.57.99/32	10.0.57.99 – 10.0.57.99	10.0.57.99
101	10.0.57.100/32	10.0.57.100 – 10.0.57.100	10.0.57.100
102	10.0.57.101/32	10.0.57.101 – 10.0.57.101	10.0.57.101
103	10.0.57.102/32	10.0.57.102 – 10.0.57.102	10.0.57.102
104	10.0.57.103/32	10.0.57.103 – 10.0.57.103	10.0.57.103
105	10.0.57.104/32	10.0.57.104 – 10.0.57.104	10.0.57.104
106	10.0.57.105/32	10.0.57.105 – 10.0.57.105	10.0.57.105
107	10.0.57.106/32	10.0.57.106 – 10.0.57.106	10.0.57.106
108	10.0.57.107/32	10.0.57.107 – 10.0.57.107	10.0.57.107
109	10.0.57.108/32	10.0.57.108 – 10.0.57.108	10.0.57.108
110	10.0.57.109/32	10.0.57.109 – 10.0.57.109	10.0.57.109
111	10.0.57.110/32	10.0.57.110 – 10.0.57.110	10.0.57.110
112	10.0.57.111/32	10.0.57.111 – 10.0.57.111	10.0.57.111
113	10.0.57.112/32	10.0.57.112 – 10.0.57.112	10.0.57.112
114	10.0.57.113/32	10.0.57.113 – 10.0.57.113	10.0.57.113
115	10.0.57.114/32	10.0.57.114 – 10.0.57.114	10.0.57.114
116	10.0.57.115/32	10.0.57.115 – 10.0.57.115	10.0.57.115
117	10.0.57.116/32	10.0.57.116 – 10.0.57.116	10.0.57.116
118	10.0.57.117/32	10.0.57.117 – 10.0.57.117	10.0.57.117
119	10.0.57.118/32	10.0.57.118 – 10.0.57.118	10.0.57.118
120	10.0.57.119/32	10.0.57.119 – 10.0.57.119	10.0.57.119
121	10.0.57.120/32	10.0.57.120 – 10.0.57.120	10.0.57.120
122	10.0.57.121/32	10.0.57.121 – 10.0.57.121	10.0.57.121
123	10.0.57.122/32	10.0.57.122 – 10.0.57.122	10.0.57.122
124	10.0.57.123/32	10.0.57.123 – 10.0.57.123	10.0.57.123
125	10.0.57.124/32	10.0.57.124 – 10.0.57.124	10.0.57.124
126	10.0.57.125/32	10.0.57.125 – 10.0.57.125	10.0.57.125
127	10.0.57.126/32	10.0.57.126 – 10.0.57.126	10.0.57.126
128	10.0.57.127/32	10.0.57.127 – 10.0.57.127	10.0.57.127
129	10.0.57.128/32	10.0.57.128 – 10.0.57.128	10.0.57.128
130	10.0.57.129/32	10.0.57.129 – 10.0.57.129	10.0.57.129
131	10.0.57.130/32	10.0.57.130 – 10.0.57.130	10.0.57.130
132	10.0.57.131/32	10.0.57.131 – 10.0.57.131	10.0.57.131
133	10.0.57.132/32	10.0.57.132 – 10.0.57.132	10.0.57.132
134	10.0.57.133/32	10.0.57.133 – 10.0.57.133	10.0.57.133
135	10.0.57.134/32	10.0.57.134 – 10.0.57.134	10.0.57.134
136	10.0.57.135/32	10.0.57.135 – 10.0.57.135	10.0.57.135
137	10.0.57.136/32	10.0.57.136 – 10.0.57.136	10.0.57.136
138	10.0.57.137/32	10.0.57.137 – 10.0.57.137	10.0.57.137
139	10.0.57.138/32	10.0.57.138 – 10.0.57.138	10.0.57.138
140	10.0.57.139/32	10.0.57.139 – 10.0.57.139	10.0.57.139
141	10.0.57.140/32	10.0.57.140 – 10.0.57.140	10.0.57.140
142	10.0.57.141/32	10.0.57.141 – 10.0.57.141	10.0.57.141
143	10.0.57.142/32	10.0.57.142 – 10.0.57.142	10.0.57.142
144	10.0.57.143/32	10.0.57.143 – 10.0.57.143	10.0.57.143
145	10.0.57.144/32	10.0.57.144 – 10.0.57.144	10.0.57.144
146	10.0.57.145/32	10.0.57.145 – 10.0.57.145	10.0.57.145
147	10.0.57.146/32	10.0.57.146 – 10.0.57.146	10.0.57.146
148	10.0.57.147/32	10.0.57.147 – 10.0.57.147	10.0.57.147
149	10.0.57.148/32	10.0.57.148 – 10.0.57.148	10.0.57.148
150	10.0.57.149/32	10.0.57.149 – 10.0.57.149	10.0.57.149
151	10.0.57.150/32	10.0.57.150 – 10.0.57.150	10.0.57.150
152	10.0.57.151/32	10.0.57.151 – 10.0.57.151	10.0.57.151
153	10.0.57.152/32	10.0.57.152 – 10.0.57.152	10.0.57.152
154	10.0.57.153/32	10.0.57.153 – 10.0.57.153	10.0.57.153
155	10.0.57.154/32	10.0.57.154 – 10.0.57.154	10.0.57.154
156	10.0.57.155/32	10.0.57.155 – 10.0.57.155	10.0.57.155
157	10.0.57.156/32	10.0.57.156 – 10.0.57.156	10.0.57.156
158	10.0.57.157/32	10.0.57.157 – 10.0.57.157	10.0.57.157
159	10.0.57.158/32	10.0.57.158 – 10.0.57.158	10.0.57.158
160	10.0.57.159/32	10.0.57.159 – 10.0.57.159	10.0.57.159
161	10.0.57.160/32	10.0.57.160 – 10.0.57.160	10.0.57.160
162	10.0.57.161/32	10.0.57.161 – 10.0.57.161	10.0.57.161
163	10.0.57.162/32	10.0.57.162 – 10.0.57.162	10.0.57.162
164	10.0.57.163/32	10.0.57.163 – 10.0.57.163	10.0.57.163
165	10.0.57.164/32	10.0.57.164 – 10.0.57.164	10.0.57.164
166	10.0.57.165/32	10.0.57.165 – 10.0.57.165	10.0.57.165
167	10.0.57.166/32	10.0.57.166 – 10.0.57.166	10.0.57.166
168	10.0.57.167/32	10.0.57.167 – 10.0.57.167	10.0.57.167
169	10.0.57.168/32	10.0.57.168 – 10.0.57.168	10.0.57.168
170	10.0.57.169/32	10.0.57.169 – 10.0.57.169	10.0.57.169
171	10.0.57.170/32	10.0.57.170 – 10.0.57.170	10.0.57.170
172	10.0.57.171/32	10.0.57.171 – 10.0.57.171	10.0.57.171
173	10.0.57.172/32	10.0.57.172 – 10.0.57.172	10.0.57.172
174	10.0.57.173/32	10.0.57.173 – 10.0.57.173	10.0.57.173
175	10.0.57.174/32	10.0.57.174 – 10.0.57.174	10.0.57.174
176	10.0.57.175/32	10.0.57.175 – 10.0.57.175	10.0.57.175
177	10.0.57.176/32	10.0.57.176 – 10.0.57.176	10.0.57.176
178	10.0.57.177/32	10.0.57.177 – 10.0.57.177	10.0.57.177
179	10.0.57.178/32	10.0.57.178 – 10.0.57.178	10.0.57.178
180	10.0.57.179/32	10.0.57.179 – 10.0.57.179	10.0.57.179
181	10.0.57.180/32	10.0.57.180 – 10.0.57.180	10.0.57.180
182	10.0.57.181/32	10.0.57.181 – 10.0.57.181	10.0.57.181
183	10.0.57.182/32	10.0.57.182 – 10.0.57.182	10.0.57.182
184	10.0.57.183/32	10.0.57.183 – 10.0.57.183	10.0.57.183
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189	10.0.57.188/32	10.0.57.188 – 10.0.57.188	10.0.57.188
190	10.0.57.189/32	10.0.57.189 – 10.0.57.189	10.0.57.189
191	10.0.57.190/32	10.0.57.190 – 10.0.57.190	10.0.57.190
192	10.0.57.191/32	10.0.57.191 – 10.0.57.191	10.0.57.191
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197	10.0.57.196/32	10.0.57.196 – 10.0.57.196	10.0.57.196
198	10.0.57.197/32	10.0.57.197 – 10.0.57.197	10.0.57.197
199	10.0.57.198/32	10.0.57.198 – 10.0.57.198	10.0.57.198
200	10.0.57.199/32	10.0.57.199 – 10.0.57.199	10.0.57.199
201	10.0.57.200/32	10.0.57.200 – 10.0.57.200	10.0.57.200
202	10.0.57.201/32	10.0.57.201 – 10.0.57.201	10.0.57.201
203	10.0.57.202/32	10.0.57.202 – 10.0.57.202	10.0.57.202
204	10.0.57.203/32	10.0.57.203 – 10.0.57.203	10.0.57.203
205	10.0.57.204/32	10.0.57.204 – 10.0.57.204	10.0.57.204
206	10.0.57.205/32	10.0.57.205 – 10.0.57.205	10.0.57.205
207	10.0.57.206/32	10.0.57.206 – 10.0.57.206	10.0.57.206
208	10.0.57.207/32	10.0.57.207 – 10.0.57.207	10.0.57.207
209	10.0.57.208/32	10.0.57.208 – 10.0.57.208	10.0.57.208
210	10.0.57.209/32	10.0.57.209 – 10.0.57.209	10.0.57.209
211	10.0.57.210/32	10.0.57.210 – 10.0.57.210	10.0.57.210
212	10.0.57.211/32	10.0.57.211 – 10.0.57.211	10.0.57.211
213	10.0.57.212/32	10.0.57.212 – 10.0.57.212	10.0.57.212
214	10.0.57.213/32	10.0.57.213 – 10.0.57.213	10.0.57.213
215	10.0.57.214/32	10.0.57.214 – 10.0.57.214	10.0.57.214
216	10.0.57.215/32	10.0.57.215 – 10.0.57.215	10.0.57.215
217	10.0.57.216/32	10.0.57.216 – 10.0.57.216	10.0.57.216
218	10.0.57.217/32	10.0.57.217 – 10.0.57.217	10.0.57.217
219	10.0.57.218/32	10.0.57.218 – 10.0.57.218	10.0.57.218
220	10.0.57.219/32	10.0.57.219 – 10.0.57.219	10.0.57.219
221	10.0.57.220/32	10.0.57.220 – 10.0.57.220	10.0.57.220
222	10.0.57.221/32	10.0.57.221 – 10.0.57.221	10.0.57.221
223	10.0.57.222/32	10.0.57.222 – 10.0.57.222	10.0.57.222
224	10.0.57.223/32	10.0.57.223 – 10.0.57.223	10.0.57.223
225	10.0.57.224/32	10.0.57.224 – 10.0.57.224	10.0.57.224
226	10.0.57.225/32	10.0.57.225 – 10.0.57.225	10.0.57.225
227	10.0.57.226/32	10.0.57.226 – 10.0.57.226	10.0.57.226
228	10.0.57.227/32	10.0.57.227 – 10.0.57.227	10.0.57.227
229	10.0.57.228/32	10.0.57.228 – 10.0.57.228	10.0.57.228
230	10.0.57.229/32	10.0.57.229 – 10.0.57.229	10.0.57.229
231	10.0.57.230/32	10.0.57.230 – 10.0.57.230	10.0.57.230
232	10.0.57.231/32	10.0.57.231 – 10.0.57.231	10.0.57.231
233	10.0.57.232/32	10.0.57.232 – 10.0.57.232	10.0.57.232
234	10.0.57.233/32	10.0.57.233 – 10.0.57.233	10.0.57.233
235	10.0.57.234/32	10.0.57.234 – 10.0.57.234	10.0.57.234
236	10.0.57.235/32	10.0.57.235 – 10.0.57.235	10.0.57.235
237	10.0.57.236/32	10.0.57.236 – 10.0.57.236	10.0.57.236
238	10.0.57.237/32	10.0.57.237 – 10.0.57.237	10.0.57.237
239	10.0.57.238/32	10.0.57.238 – 10.0.57.238	10.0.57.238
240	10.0.57.239/32	10.0.57.239 – 10.0.57.239	10.0.57.239
241	10.0.57.240/32	10.0.57.240 – 10.0.57.240	10.0.57.240
242	10.0.57.241/32	10.0.57.241 – 10.0.57.241	10.0.57.241
243	10.0.57.242/32	10.0.57.242 – 10.0.57.242	10.0.57.242
244	10.0.57.243/32	10.0.57.243 – 10.0.57.243	10.0.57.243
245	10.0.57.244/32	10.0.57.244 – 10.0.57.244	10.0.57.244
246	10.0.57.245/32	10.0.57.245 – 10.0.57.245	10.0.57.245
247	10.0.57.246/32	10.0.57.246 – 10.0.57.246	10.0.57.246
248	10.0.57.247/32	10.0.57.247 – 10.0.57.247	10.0.57.247
249	10.0.57.248/32	10.0.57.248 – 10.0.57.248	10.0.57.248
250	10.0.57.249/32	10.0.57.249 – 10.0.57.249	10.0.57.249
251	10.0.57.250/32	10.0.57.250 – 10.0.57.250	10.0.57.250
252	10.0.57.251/32	10.0.57.251 – 10.0.57.251	10.0.57.251
253	10.0.57.252/32	10.0.57.252 – 10.0.57.252	10.0.57.252
254	10.0.57.253/32	10.0.57.253 – 10.0.57.253	10.0.57.253
255	10.0.57.254/32	10.0.57.254 – 10.0.57.254	10.0.57.254
256	10.0.57.255/32	10.0.57.255 – 10.0.57.255	10.0.57.255

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 →