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)10.2.245.0/24

network10.2.245.0/24

broadcast10.2.245.255

first host10.2.245.1

last host10.2.245.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.245.0/24

address00001010.00000010.11110101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11110101.00000000

broadcast00001010.00000010.11110101.11111111

green = network part, grey = host part

hex0x0a02f500

decimal167965952

reverse dns0.245.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f500

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.245.0/32	10.2.245.0 – 10.2.245.0	10.2.245.0
2	10.2.245.1/32	10.2.245.1 – 10.2.245.1	10.2.245.1
3	10.2.245.2/32	10.2.245.2 – 10.2.245.2	10.2.245.2
4	10.2.245.3/32	10.2.245.3 – 10.2.245.3	10.2.245.3
5	10.2.245.4/32	10.2.245.4 – 10.2.245.4	10.2.245.4
6	10.2.245.5/32	10.2.245.5 – 10.2.245.5	10.2.245.5
7	10.2.245.6/32	10.2.245.6 – 10.2.245.6	10.2.245.6
8	10.2.245.7/32	10.2.245.7 – 10.2.245.7	10.2.245.7
9	10.2.245.8/32	10.2.245.8 – 10.2.245.8	10.2.245.8
10	10.2.245.9/32	10.2.245.9 – 10.2.245.9	10.2.245.9
11	10.2.245.10/32	10.2.245.10 – 10.2.245.10	10.2.245.10
12	10.2.245.11/32	10.2.245.11 – 10.2.245.11	10.2.245.11
13	10.2.245.12/32	10.2.245.12 – 10.2.245.12	10.2.245.12
14	10.2.245.13/32	10.2.245.13 – 10.2.245.13	10.2.245.13
15	10.2.245.14/32	10.2.245.14 – 10.2.245.14	10.2.245.14
16	10.2.245.15/32	10.2.245.15 – 10.2.245.15	10.2.245.15
17	10.2.245.16/32	10.2.245.16 – 10.2.245.16	10.2.245.16
18	10.2.245.17/32	10.2.245.17 – 10.2.245.17	10.2.245.17
19	10.2.245.18/32	10.2.245.18 – 10.2.245.18	10.2.245.18
20	10.2.245.19/32	10.2.245.19 – 10.2.245.19	10.2.245.19
21	10.2.245.20/32	10.2.245.20 – 10.2.245.20	10.2.245.20
22	10.2.245.21/32	10.2.245.21 – 10.2.245.21	10.2.245.21
23	10.2.245.22/32	10.2.245.22 – 10.2.245.22	10.2.245.22
24	10.2.245.23/32	10.2.245.23 – 10.2.245.23	10.2.245.23
25	10.2.245.24/32	10.2.245.24 – 10.2.245.24	10.2.245.24
26	10.2.245.25/32	10.2.245.25 – 10.2.245.25	10.2.245.25
27	10.2.245.26/32	10.2.245.26 – 10.2.245.26	10.2.245.26
28	10.2.245.27/32	10.2.245.27 – 10.2.245.27	10.2.245.27
29	10.2.245.28/32	10.2.245.28 – 10.2.245.28	10.2.245.28
30	10.2.245.29/32	10.2.245.29 – 10.2.245.29	10.2.245.29
31	10.2.245.30/32	10.2.245.30 – 10.2.245.30	10.2.245.30
32	10.2.245.31/32	10.2.245.31 – 10.2.245.31	10.2.245.31
33	10.2.245.32/32	10.2.245.32 – 10.2.245.32	10.2.245.32
34	10.2.245.33/32	10.2.245.33 – 10.2.245.33	10.2.245.33
35	10.2.245.34/32	10.2.245.34 – 10.2.245.34	10.2.245.34
36	10.2.245.35/32	10.2.245.35 – 10.2.245.35	10.2.245.35
37	10.2.245.36/32	10.2.245.36 – 10.2.245.36	10.2.245.36
38	10.2.245.37/32	10.2.245.37 – 10.2.245.37	10.2.245.37
39	10.2.245.38/32	10.2.245.38 – 10.2.245.38	10.2.245.38
40	10.2.245.39/32	10.2.245.39 – 10.2.245.39	10.2.245.39
41	10.2.245.40/32	10.2.245.40 – 10.2.245.40	10.2.245.40
42	10.2.245.41/32	10.2.245.41 – 10.2.245.41	10.2.245.41
43	10.2.245.42/32	10.2.245.42 – 10.2.245.42	10.2.245.42
44	10.2.245.43/32	10.2.245.43 – 10.2.245.43	10.2.245.43
45	10.2.245.44/32	10.2.245.44 – 10.2.245.44	10.2.245.44
46	10.2.245.45/32	10.2.245.45 – 10.2.245.45	10.2.245.45
47	10.2.245.46/32	10.2.245.46 – 10.2.245.46	10.2.245.46
48	10.2.245.47/32	10.2.245.47 – 10.2.245.47	10.2.245.47
49	10.2.245.48/32	10.2.245.48 – 10.2.245.48	10.2.245.48
50	10.2.245.49/32	10.2.245.49 – 10.2.245.49	10.2.245.49
51	10.2.245.50/32	10.2.245.50 – 10.2.245.50	10.2.245.50
52	10.2.245.51/32	10.2.245.51 – 10.2.245.51	10.2.245.51
53	10.2.245.52/32	10.2.245.52 – 10.2.245.52	10.2.245.52
54	10.2.245.53/32	10.2.245.53 – 10.2.245.53	10.2.245.53
55	10.2.245.54/32	10.2.245.54 – 10.2.245.54	10.2.245.54
56	10.2.245.55/32	10.2.245.55 – 10.2.245.55	10.2.245.55
57	10.2.245.56/32	10.2.245.56 – 10.2.245.56	10.2.245.56
58	10.2.245.57/32	10.2.245.57 – 10.2.245.57	10.2.245.57
59	10.2.245.58/32	10.2.245.58 – 10.2.245.58	10.2.245.58
60	10.2.245.59/32	10.2.245.59 – 10.2.245.59	10.2.245.59
61	10.2.245.60/32	10.2.245.60 – 10.2.245.60	10.2.245.60
62	10.2.245.61/32	10.2.245.61 – 10.2.245.61	10.2.245.61
63	10.2.245.62/32	10.2.245.62 – 10.2.245.62	10.2.245.62
64	10.2.245.63/32	10.2.245.63 – 10.2.245.63	10.2.245.63
65	10.2.245.64/32	10.2.245.64 – 10.2.245.64	10.2.245.64
66	10.2.245.65/32	10.2.245.65 – 10.2.245.65	10.2.245.65
67	10.2.245.66/32	10.2.245.66 – 10.2.245.66	10.2.245.66
68	10.2.245.67/32	10.2.245.67 – 10.2.245.67	10.2.245.67
69	10.2.245.68/32	10.2.245.68 – 10.2.245.68	10.2.245.68
70	10.2.245.69/32	10.2.245.69 – 10.2.245.69	10.2.245.69
71	10.2.245.70/32	10.2.245.70 – 10.2.245.70	10.2.245.70
72	10.2.245.71/32	10.2.245.71 – 10.2.245.71	10.2.245.71
73	10.2.245.72/32	10.2.245.72 – 10.2.245.72	10.2.245.72
74	10.2.245.73/32	10.2.245.73 – 10.2.245.73	10.2.245.73
75	10.2.245.74/32	10.2.245.74 – 10.2.245.74	10.2.245.74
76	10.2.245.75/32	10.2.245.75 – 10.2.245.75	10.2.245.75
77	10.2.245.76/32	10.2.245.76 – 10.2.245.76	10.2.245.76
78	10.2.245.77/32	10.2.245.77 – 10.2.245.77	10.2.245.77
79	10.2.245.78/32	10.2.245.78 – 10.2.245.78	10.2.245.78
80	10.2.245.79/32	10.2.245.79 – 10.2.245.79	10.2.245.79
81	10.2.245.80/32	10.2.245.80 – 10.2.245.80	10.2.245.80
82	10.2.245.81/32	10.2.245.81 – 10.2.245.81	10.2.245.81
83	10.2.245.82/32	10.2.245.82 – 10.2.245.82	10.2.245.82
84	10.2.245.83/32	10.2.245.83 – 10.2.245.83	10.2.245.83
85	10.2.245.84/32	10.2.245.84 – 10.2.245.84	10.2.245.84
86	10.2.245.85/32	10.2.245.85 – 10.2.245.85	10.2.245.85
87	10.2.245.86/32	10.2.245.86 – 10.2.245.86	10.2.245.86
88	10.2.245.87/32	10.2.245.87 – 10.2.245.87	10.2.245.87
89	10.2.245.88/32	10.2.245.88 – 10.2.245.88	10.2.245.88
90	10.2.245.89/32	10.2.245.89 – 10.2.245.89	10.2.245.89
91	10.2.245.90/32	10.2.245.90 – 10.2.245.90	10.2.245.90
92	10.2.245.91/32	10.2.245.91 – 10.2.245.91	10.2.245.91
93	10.2.245.92/32	10.2.245.92 – 10.2.245.92	10.2.245.92
94	10.2.245.93/32	10.2.245.93 – 10.2.245.93	10.2.245.93
95	10.2.245.94/32	10.2.245.94 – 10.2.245.94	10.2.245.94
96	10.2.245.95/32	10.2.245.95 – 10.2.245.95	10.2.245.95
97	10.2.245.96/32	10.2.245.96 – 10.2.245.96	10.2.245.96
98	10.2.245.97/32	10.2.245.97 – 10.2.245.97	10.2.245.97
99	10.2.245.98/32	10.2.245.98 – 10.2.245.98	10.2.245.98
100	10.2.245.99/32	10.2.245.99 – 10.2.245.99	10.2.245.99
101	10.2.245.100/32	10.2.245.100 – 10.2.245.100	10.2.245.100
102	10.2.245.101/32	10.2.245.101 – 10.2.245.101	10.2.245.101
103	10.2.245.102/32	10.2.245.102 – 10.2.245.102	10.2.245.102
104	10.2.245.103/32	10.2.245.103 – 10.2.245.103	10.2.245.103
105	10.2.245.104/32	10.2.245.104 – 10.2.245.104	10.2.245.104
106	10.2.245.105/32	10.2.245.105 – 10.2.245.105	10.2.245.105
107	10.2.245.106/32	10.2.245.106 – 10.2.245.106	10.2.245.106
108	10.2.245.107/32	10.2.245.107 – 10.2.245.107	10.2.245.107
109	10.2.245.108/32	10.2.245.108 – 10.2.245.108	10.2.245.108
110	10.2.245.109/32	10.2.245.109 – 10.2.245.109	10.2.245.109
111	10.2.245.110/32	10.2.245.110 – 10.2.245.110	10.2.245.110
112	10.2.245.111/32	10.2.245.111 – 10.2.245.111	10.2.245.111
113	10.2.245.112/32	10.2.245.112 – 10.2.245.112	10.2.245.112
114	10.2.245.113/32	10.2.245.113 – 10.2.245.113	10.2.245.113
115	10.2.245.114/32	10.2.245.114 – 10.2.245.114	10.2.245.114
116	10.2.245.115/32	10.2.245.115 – 10.2.245.115	10.2.245.115
117	10.2.245.116/32	10.2.245.116 – 10.2.245.116	10.2.245.116
118	10.2.245.117/32	10.2.245.117 – 10.2.245.117	10.2.245.117
119	10.2.245.118/32	10.2.245.118 – 10.2.245.118	10.2.245.118
120	10.2.245.119/32	10.2.245.119 – 10.2.245.119	10.2.245.119
121	10.2.245.120/32	10.2.245.120 – 10.2.245.120	10.2.245.120
122	10.2.245.121/32	10.2.245.121 – 10.2.245.121	10.2.245.121
123	10.2.245.122/32	10.2.245.122 – 10.2.245.122	10.2.245.122
124	10.2.245.123/32	10.2.245.123 – 10.2.245.123	10.2.245.123
125	10.2.245.124/32	10.2.245.124 – 10.2.245.124	10.2.245.124
126	10.2.245.125/32	10.2.245.125 – 10.2.245.125	10.2.245.125
127	10.2.245.126/32	10.2.245.126 – 10.2.245.126	10.2.245.126
128	10.2.245.127/32	10.2.245.127 – 10.2.245.127	10.2.245.127
129	10.2.245.128/32	10.2.245.128 – 10.2.245.128	10.2.245.128
130	10.2.245.129/32	10.2.245.129 – 10.2.245.129	10.2.245.129
131	10.2.245.130/32	10.2.245.130 – 10.2.245.130	10.2.245.130
132	10.2.245.131/32	10.2.245.131 – 10.2.245.131	10.2.245.131
133	10.2.245.132/32	10.2.245.132 – 10.2.245.132	10.2.245.132
134	10.2.245.133/32	10.2.245.133 – 10.2.245.133	10.2.245.133
135	10.2.245.134/32	10.2.245.134 – 10.2.245.134	10.2.245.134
136	10.2.245.135/32	10.2.245.135 – 10.2.245.135	10.2.245.135
137	10.2.245.136/32	10.2.245.136 – 10.2.245.136	10.2.245.136
138	10.2.245.137/32	10.2.245.137 – 10.2.245.137	10.2.245.137
139	10.2.245.138/32	10.2.245.138 – 10.2.245.138	10.2.245.138
140	10.2.245.139/32	10.2.245.139 – 10.2.245.139	10.2.245.139
141	10.2.245.140/32	10.2.245.140 – 10.2.245.140	10.2.245.140
142	10.2.245.141/32	10.2.245.141 – 10.2.245.141	10.2.245.141
143	10.2.245.142/32	10.2.245.142 – 10.2.245.142	10.2.245.142
144	10.2.245.143/32	10.2.245.143 – 10.2.245.143	10.2.245.143
145	10.2.245.144/32	10.2.245.144 – 10.2.245.144	10.2.245.144
146	10.2.245.145/32	10.2.245.145 – 10.2.245.145	10.2.245.145
147	10.2.245.146/32	10.2.245.146 – 10.2.245.146	10.2.245.146
148	10.2.245.147/32	10.2.245.147 – 10.2.245.147	10.2.245.147
149	10.2.245.148/32	10.2.245.148 – 10.2.245.148	10.2.245.148
150	10.2.245.149/32	10.2.245.149 – 10.2.245.149	10.2.245.149
151	10.2.245.150/32	10.2.245.150 – 10.2.245.150	10.2.245.150
152	10.2.245.151/32	10.2.245.151 – 10.2.245.151	10.2.245.151
153	10.2.245.152/32	10.2.245.152 – 10.2.245.152	10.2.245.152
154	10.2.245.153/32	10.2.245.153 – 10.2.245.153	10.2.245.153
155	10.2.245.154/32	10.2.245.154 – 10.2.245.154	10.2.245.154
156	10.2.245.155/32	10.2.245.155 – 10.2.245.155	10.2.245.155
157	10.2.245.156/32	10.2.245.156 – 10.2.245.156	10.2.245.156
158	10.2.245.157/32	10.2.245.157 – 10.2.245.157	10.2.245.157
159	10.2.245.158/32	10.2.245.158 – 10.2.245.158	10.2.245.158
160	10.2.245.159/32	10.2.245.159 – 10.2.245.159	10.2.245.159
161	10.2.245.160/32	10.2.245.160 – 10.2.245.160	10.2.245.160
162	10.2.245.161/32	10.2.245.161 – 10.2.245.161	10.2.245.161
163	10.2.245.162/32	10.2.245.162 – 10.2.245.162	10.2.245.162
164	10.2.245.163/32	10.2.245.163 – 10.2.245.163	10.2.245.163
165	10.2.245.164/32	10.2.245.164 – 10.2.245.164	10.2.245.164
166	10.2.245.165/32	10.2.245.165 – 10.2.245.165	10.2.245.165
167	10.2.245.166/32	10.2.245.166 – 10.2.245.166	10.2.245.166
168	10.2.245.167/32	10.2.245.167 – 10.2.245.167	10.2.245.167
169	10.2.245.168/32	10.2.245.168 – 10.2.245.168	10.2.245.168
170	10.2.245.169/32	10.2.245.169 – 10.2.245.169	10.2.245.169
171	10.2.245.170/32	10.2.245.170 – 10.2.245.170	10.2.245.170
172	10.2.245.171/32	10.2.245.171 – 10.2.245.171	10.2.245.171
173	10.2.245.172/32	10.2.245.172 – 10.2.245.172	10.2.245.172
174	10.2.245.173/32	10.2.245.173 – 10.2.245.173	10.2.245.173
175	10.2.245.174/32	10.2.245.174 – 10.2.245.174	10.2.245.174
176	10.2.245.175/32	10.2.245.175 – 10.2.245.175	10.2.245.175
177	10.2.245.176/32	10.2.245.176 – 10.2.245.176	10.2.245.176
178	10.2.245.177/32	10.2.245.177 – 10.2.245.177	10.2.245.177
179	10.2.245.178/32	10.2.245.178 – 10.2.245.178	10.2.245.178
180	10.2.245.179/32	10.2.245.179 – 10.2.245.179	10.2.245.179
181	10.2.245.180/32	10.2.245.180 – 10.2.245.180	10.2.245.180
182	10.2.245.181/32	10.2.245.181 – 10.2.245.181	10.2.245.181
183	10.2.245.182/32	10.2.245.182 – 10.2.245.182	10.2.245.182
184	10.2.245.183/32	10.2.245.183 – 10.2.245.183	10.2.245.183
185	10.2.245.184/32	10.2.245.184 – 10.2.245.184	10.2.245.184
186	10.2.245.185/32	10.2.245.185 – 10.2.245.185	10.2.245.185
187	10.2.245.186/32	10.2.245.186 – 10.2.245.186	10.2.245.186
188	10.2.245.187/32	10.2.245.187 – 10.2.245.187	10.2.245.187
189	10.2.245.188/32	10.2.245.188 – 10.2.245.188	10.2.245.188
190	10.2.245.189/32	10.2.245.189 – 10.2.245.189	10.2.245.189
191	10.2.245.190/32	10.2.245.190 – 10.2.245.190	10.2.245.190
192	10.2.245.191/32	10.2.245.191 – 10.2.245.191	10.2.245.191
193	10.2.245.192/32	10.2.245.192 – 10.2.245.192	10.2.245.192
194	10.2.245.193/32	10.2.245.193 – 10.2.245.193	10.2.245.193
195	10.2.245.194/32	10.2.245.194 – 10.2.245.194	10.2.245.194
196	10.2.245.195/32	10.2.245.195 – 10.2.245.195	10.2.245.195
197	10.2.245.196/32	10.2.245.196 – 10.2.245.196	10.2.245.196
198	10.2.245.197/32	10.2.245.197 – 10.2.245.197	10.2.245.197
199	10.2.245.198/32	10.2.245.198 – 10.2.245.198	10.2.245.198
200	10.2.245.199/32	10.2.245.199 – 10.2.245.199	10.2.245.199
201	10.2.245.200/32	10.2.245.200 – 10.2.245.200	10.2.245.200
202	10.2.245.201/32	10.2.245.201 – 10.2.245.201	10.2.245.201
203	10.2.245.202/32	10.2.245.202 – 10.2.245.202	10.2.245.202
204	10.2.245.203/32	10.2.245.203 – 10.2.245.203	10.2.245.203
205	10.2.245.204/32	10.2.245.204 – 10.2.245.204	10.2.245.204
206	10.2.245.205/32	10.2.245.205 – 10.2.245.205	10.2.245.205
207	10.2.245.206/32	10.2.245.206 – 10.2.245.206	10.2.245.206
208	10.2.245.207/32	10.2.245.207 – 10.2.245.207	10.2.245.207
209	10.2.245.208/32	10.2.245.208 – 10.2.245.208	10.2.245.208
210	10.2.245.209/32	10.2.245.209 – 10.2.245.209	10.2.245.209
211	10.2.245.210/32	10.2.245.210 – 10.2.245.210	10.2.245.210
212	10.2.245.211/32	10.2.245.211 – 10.2.245.211	10.2.245.211
213	10.2.245.212/32	10.2.245.212 – 10.2.245.212	10.2.245.212
214	10.2.245.213/32	10.2.245.213 – 10.2.245.213	10.2.245.213
215	10.2.245.214/32	10.2.245.214 – 10.2.245.214	10.2.245.214
216	10.2.245.215/32	10.2.245.215 – 10.2.245.215	10.2.245.215
217	10.2.245.216/32	10.2.245.216 – 10.2.245.216	10.2.245.216
218	10.2.245.217/32	10.2.245.217 – 10.2.245.217	10.2.245.217
219	10.2.245.218/32	10.2.245.218 – 10.2.245.218	10.2.245.218
220	10.2.245.219/32	10.2.245.219 – 10.2.245.219	10.2.245.219
221	10.2.245.220/32	10.2.245.220 – 10.2.245.220	10.2.245.220
222	10.2.245.221/32	10.2.245.221 – 10.2.245.221	10.2.245.221
223	10.2.245.222/32	10.2.245.222 – 10.2.245.222	10.2.245.222
224	10.2.245.223/32	10.2.245.223 – 10.2.245.223	10.2.245.223
225	10.2.245.224/32	10.2.245.224 – 10.2.245.224	10.2.245.224
226	10.2.245.225/32	10.2.245.225 – 10.2.245.225	10.2.245.225
227	10.2.245.226/32	10.2.245.226 – 10.2.245.226	10.2.245.226
228	10.2.245.227/32	10.2.245.227 – 10.2.245.227	10.2.245.227
229	10.2.245.228/32	10.2.245.228 – 10.2.245.228	10.2.245.228
230	10.2.245.229/32	10.2.245.229 – 10.2.245.229	10.2.245.229
231	10.2.245.230/32	10.2.245.230 – 10.2.245.230	10.2.245.230
232	10.2.245.231/32	10.2.245.231 – 10.2.245.231	10.2.245.231
233	10.2.245.232/32	10.2.245.232 – 10.2.245.232	10.2.245.232
234	10.2.245.233/32	10.2.245.233 – 10.2.245.233	10.2.245.233
235	10.2.245.234/32	10.2.245.234 – 10.2.245.234	10.2.245.234
236	10.2.245.235/32	10.2.245.235 – 10.2.245.235	10.2.245.235
237	10.2.245.236/32	10.2.245.236 – 10.2.245.236	10.2.245.236
238	10.2.245.237/32	10.2.245.237 – 10.2.245.237	10.2.245.237
239	10.2.245.238/32	10.2.245.238 – 10.2.245.238	10.2.245.238
240	10.2.245.239/32	10.2.245.239 – 10.2.245.239	10.2.245.239
241	10.2.245.240/32	10.2.245.240 – 10.2.245.240	10.2.245.240
242	10.2.245.241/32	10.2.245.241 – 10.2.245.241	10.2.245.241
243	10.2.245.242/32	10.2.245.242 – 10.2.245.242	10.2.245.242
244	10.2.245.243/32	10.2.245.243 – 10.2.245.243	10.2.245.243
245	10.2.245.244/32	10.2.245.244 – 10.2.245.244	10.2.245.244
246	10.2.245.245/32	10.2.245.245 – 10.2.245.245	10.2.245.245
247	10.2.245.246/32	10.2.245.246 – 10.2.245.246	10.2.245.246
248	10.2.245.247/32	10.2.245.247 – 10.2.245.247	10.2.245.247
249	10.2.245.248/32	10.2.245.248 – 10.2.245.248	10.2.245.248
250	10.2.245.249/32	10.2.245.249 – 10.2.245.249	10.2.245.249
251	10.2.245.250/32	10.2.245.250 – 10.2.245.250	10.2.245.250
252	10.2.245.251/32	10.2.245.251 – 10.2.245.251	10.2.245.251
253	10.2.245.252/32	10.2.245.252 – 10.2.245.252	10.2.245.252
254	10.2.245.253/32	10.2.245.253 – 10.2.245.253	10.2.245.253
255	10.2.245.254/32	10.2.245.254 – 10.2.245.254	10.2.245.254
256	10.2.245.255/32	10.2.245.255 – 10.2.245.255	10.2.245.255

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 →