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)10.87.86.0/23

network10.87.86.0/23

broadcast10.87.87.255

first host10.87.86.1

last host10.87.87.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.87.86.0/23

address00001010.01010111.01010110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01010111.01010110.00000000

broadcast00001010.01010111.01010111.11111111

green = network part, grey = host part

hex0x0a575600

decimal173495808

reverse dns0.86.87.10.in-addr.arpa

ipv4-mapped::ffff:a57:5600

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.87.86.0/31	10.87.86.0 – 10.87.86.1	10.87.86.1
2	10.87.86.2/31	10.87.86.2 – 10.87.86.3	10.87.86.3
3	10.87.86.4/31	10.87.86.4 – 10.87.86.5	10.87.86.5
4	10.87.86.6/31	10.87.86.6 – 10.87.86.7	10.87.86.7
5	10.87.86.8/31	10.87.86.8 – 10.87.86.9	10.87.86.9
6	10.87.86.10/31	10.87.86.10 – 10.87.86.11	10.87.86.11
7	10.87.86.12/31	10.87.86.12 – 10.87.86.13	10.87.86.13
8	10.87.86.14/31	10.87.86.14 – 10.87.86.15	10.87.86.15
9	10.87.86.16/31	10.87.86.16 – 10.87.86.17	10.87.86.17
10	10.87.86.18/31	10.87.86.18 – 10.87.86.19	10.87.86.19
11	10.87.86.20/31	10.87.86.20 – 10.87.86.21	10.87.86.21
12	10.87.86.22/31	10.87.86.22 – 10.87.86.23	10.87.86.23
13	10.87.86.24/31	10.87.86.24 – 10.87.86.25	10.87.86.25
14	10.87.86.26/31	10.87.86.26 – 10.87.86.27	10.87.86.27
15	10.87.86.28/31	10.87.86.28 – 10.87.86.29	10.87.86.29
16	10.87.86.30/31	10.87.86.30 – 10.87.86.31	10.87.86.31
17	10.87.86.32/31	10.87.86.32 – 10.87.86.33	10.87.86.33
18	10.87.86.34/31	10.87.86.34 – 10.87.86.35	10.87.86.35
19	10.87.86.36/31	10.87.86.36 – 10.87.86.37	10.87.86.37
20	10.87.86.38/31	10.87.86.38 – 10.87.86.39	10.87.86.39
21	10.87.86.40/31	10.87.86.40 – 10.87.86.41	10.87.86.41
22	10.87.86.42/31	10.87.86.42 – 10.87.86.43	10.87.86.43
23	10.87.86.44/31	10.87.86.44 – 10.87.86.45	10.87.86.45
24	10.87.86.46/31	10.87.86.46 – 10.87.86.47	10.87.86.47
25	10.87.86.48/31	10.87.86.48 – 10.87.86.49	10.87.86.49
26	10.87.86.50/31	10.87.86.50 – 10.87.86.51	10.87.86.51
27	10.87.86.52/31	10.87.86.52 – 10.87.86.53	10.87.86.53
28	10.87.86.54/31	10.87.86.54 – 10.87.86.55	10.87.86.55
29	10.87.86.56/31	10.87.86.56 – 10.87.86.57	10.87.86.57
30	10.87.86.58/31	10.87.86.58 – 10.87.86.59	10.87.86.59
31	10.87.86.60/31	10.87.86.60 – 10.87.86.61	10.87.86.61
32	10.87.86.62/31	10.87.86.62 – 10.87.86.63	10.87.86.63
33	10.87.86.64/31	10.87.86.64 – 10.87.86.65	10.87.86.65
34	10.87.86.66/31	10.87.86.66 – 10.87.86.67	10.87.86.67
35	10.87.86.68/31	10.87.86.68 – 10.87.86.69	10.87.86.69
36	10.87.86.70/31	10.87.86.70 – 10.87.86.71	10.87.86.71
37	10.87.86.72/31	10.87.86.72 – 10.87.86.73	10.87.86.73
38	10.87.86.74/31	10.87.86.74 – 10.87.86.75	10.87.86.75
39	10.87.86.76/31	10.87.86.76 – 10.87.86.77	10.87.86.77
40	10.87.86.78/31	10.87.86.78 – 10.87.86.79	10.87.86.79
41	10.87.86.80/31	10.87.86.80 – 10.87.86.81	10.87.86.81
42	10.87.86.82/31	10.87.86.82 – 10.87.86.83	10.87.86.83
43	10.87.86.84/31	10.87.86.84 – 10.87.86.85	10.87.86.85
44	10.87.86.86/31	10.87.86.86 – 10.87.86.87	10.87.86.87
45	10.87.86.88/31	10.87.86.88 – 10.87.86.89	10.87.86.89
46	10.87.86.90/31	10.87.86.90 – 10.87.86.91	10.87.86.91
47	10.87.86.92/31	10.87.86.92 – 10.87.86.93	10.87.86.93
48	10.87.86.94/31	10.87.86.94 – 10.87.86.95	10.87.86.95
49	10.87.86.96/31	10.87.86.96 – 10.87.86.97	10.87.86.97
50	10.87.86.98/31	10.87.86.98 – 10.87.86.99	10.87.86.99
51	10.87.86.100/31	10.87.86.100 – 10.87.86.101	10.87.86.101
52	10.87.86.102/31	10.87.86.102 – 10.87.86.103	10.87.86.103
53	10.87.86.104/31	10.87.86.104 – 10.87.86.105	10.87.86.105
54	10.87.86.106/31	10.87.86.106 – 10.87.86.107	10.87.86.107
55	10.87.86.108/31	10.87.86.108 – 10.87.86.109	10.87.86.109
56	10.87.86.110/31	10.87.86.110 – 10.87.86.111	10.87.86.111
57	10.87.86.112/31	10.87.86.112 – 10.87.86.113	10.87.86.113
58	10.87.86.114/31	10.87.86.114 – 10.87.86.115	10.87.86.115
59	10.87.86.116/31	10.87.86.116 – 10.87.86.117	10.87.86.117
60	10.87.86.118/31	10.87.86.118 – 10.87.86.119	10.87.86.119
61	10.87.86.120/31	10.87.86.120 – 10.87.86.121	10.87.86.121
62	10.87.86.122/31	10.87.86.122 – 10.87.86.123	10.87.86.123
63	10.87.86.124/31	10.87.86.124 – 10.87.86.125	10.87.86.125
64	10.87.86.126/31	10.87.86.126 – 10.87.86.127	10.87.86.127
65	10.87.86.128/31	10.87.86.128 – 10.87.86.129	10.87.86.129
66	10.87.86.130/31	10.87.86.130 – 10.87.86.131	10.87.86.131
67	10.87.86.132/31	10.87.86.132 – 10.87.86.133	10.87.86.133
68	10.87.86.134/31	10.87.86.134 – 10.87.86.135	10.87.86.135
69	10.87.86.136/31	10.87.86.136 – 10.87.86.137	10.87.86.137
70	10.87.86.138/31	10.87.86.138 – 10.87.86.139	10.87.86.139
71	10.87.86.140/31	10.87.86.140 – 10.87.86.141	10.87.86.141
72	10.87.86.142/31	10.87.86.142 – 10.87.86.143	10.87.86.143
73	10.87.86.144/31	10.87.86.144 – 10.87.86.145	10.87.86.145
74	10.87.86.146/31	10.87.86.146 – 10.87.86.147	10.87.86.147
75	10.87.86.148/31	10.87.86.148 – 10.87.86.149	10.87.86.149
76	10.87.86.150/31	10.87.86.150 – 10.87.86.151	10.87.86.151
77	10.87.86.152/31	10.87.86.152 – 10.87.86.153	10.87.86.153
78	10.87.86.154/31	10.87.86.154 – 10.87.86.155	10.87.86.155
79	10.87.86.156/31	10.87.86.156 – 10.87.86.157	10.87.86.157
80	10.87.86.158/31	10.87.86.158 – 10.87.86.159	10.87.86.159
81	10.87.86.160/31	10.87.86.160 – 10.87.86.161	10.87.86.161
82	10.87.86.162/31	10.87.86.162 – 10.87.86.163	10.87.86.163
83	10.87.86.164/31	10.87.86.164 – 10.87.86.165	10.87.86.165
84	10.87.86.166/31	10.87.86.166 – 10.87.86.167	10.87.86.167
85	10.87.86.168/31	10.87.86.168 – 10.87.86.169	10.87.86.169
86	10.87.86.170/31	10.87.86.170 – 10.87.86.171	10.87.86.171
87	10.87.86.172/31	10.87.86.172 – 10.87.86.173	10.87.86.173
88	10.87.86.174/31	10.87.86.174 – 10.87.86.175	10.87.86.175
89	10.87.86.176/31	10.87.86.176 – 10.87.86.177	10.87.86.177
90	10.87.86.178/31	10.87.86.178 – 10.87.86.179	10.87.86.179
91	10.87.86.180/31	10.87.86.180 – 10.87.86.181	10.87.86.181
92	10.87.86.182/31	10.87.86.182 – 10.87.86.183	10.87.86.183
93	10.87.86.184/31	10.87.86.184 – 10.87.86.185	10.87.86.185
94	10.87.86.186/31	10.87.86.186 – 10.87.86.187	10.87.86.187
95	10.87.86.188/31	10.87.86.188 – 10.87.86.189	10.87.86.189
96	10.87.86.190/31	10.87.86.190 – 10.87.86.191	10.87.86.191
97	10.87.86.192/31	10.87.86.192 – 10.87.86.193	10.87.86.193
98	10.87.86.194/31	10.87.86.194 – 10.87.86.195	10.87.86.195
99	10.87.86.196/31	10.87.86.196 – 10.87.86.197	10.87.86.197
100	10.87.86.198/31	10.87.86.198 – 10.87.86.199	10.87.86.199
101	10.87.86.200/31	10.87.86.200 – 10.87.86.201	10.87.86.201
102	10.87.86.202/31	10.87.86.202 – 10.87.86.203	10.87.86.203
103	10.87.86.204/31	10.87.86.204 – 10.87.86.205	10.87.86.205
104	10.87.86.206/31	10.87.86.206 – 10.87.86.207	10.87.86.207
105	10.87.86.208/31	10.87.86.208 – 10.87.86.209	10.87.86.209
106	10.87.86.210/31	10.87.86.210 – 10.87.86.211	10.87.86.211
107	10.87.86.212/31	10.87.86.212 – 10.87.86.213	10.87.86.213
108	10.87.86.214/31	10.87.86.214 – 10.87.86.215	10.87.86.215
109	10.87.86.216/31	10.87.86.216 – 10.87.86.217	10.87.86.217
110	10.87.86.218/31	10.87.86.218 – 10.87.86.219	10.87.86.219
111	10.87.86.220/31	10.87.86.220 – 10.87.86.221	10.87.86.221
112	10.87.86.222/31	10.87.86.222 – 10.87.86.223	10.87.86.223
113	10.87.86.224/31	10.87.86.224 – 10.87.86.225	10.87.86.225
114	10.87.86.226/31	10.87.86.226 – 10.87.86.227	10.87.86.227
115	10.87.86.228/31	10.87.86.228 – 10.87.86.229	10.87.86.229
116	10.87.86.230/31	10.87.86.230 – 10.87.86.231	10.87.86.231
117	10.87.86.232/31	10.87.86.232 – 10.87.86.233	10.87.86.233
118	10.87.86.234/31	10.87.86.234 – 10.87.86.235	10.87.86.235
119	10.87.86.236/31	10.87.86.236 – 10.87.86.237	10.87.86.237
120	10.87.86.238/31	10.87.86.238 – 10.87.86.239	10.87.86.239
121	10.87.86.240/31	10.87.86.240 – 10.87.86.241	10.87.86.241
122	10.87.86.242/31	10.87.86.242 – 10.87.86.243	10.87.86.243
123	10.87.86.244/31	10.87.86.244 – 10.87.86.245	10.87.86.245
124	10.87.86.246/31	10.87.86.246 – 10.87.86.247	10.87.86.247
125	10.87.86.248/31	10.87.86.248 – 10.87.86.249	10.87.86.249
126	10.87.86.250/31	10.87.86.250 – 10.87.86.251	10.87.86.251
127	10.87.86.252/31	10.87.86.252 – 10.87.86.253	10.87.86.253
128	10.87.86.254/31	10.87.86.254 – 10.87.86.255	10.87.86.255
129	10.87.87.0/31	10.87.87.0 – 10.87.87.1	10.87.87.1
130	10.87.87.2/31	10.87.87.2 – 10.87.87.3	10.87.87.3
131	10.87.87.4/31	10.87.87.4 – 10.87.87.5	10.87.87.5
132	10.87.87.6/31	10.87.87.6 – 10.87.87.7	10.87.87.7
133	10.87.87.8/31	10.87.87.8 – 10.87.87.9	10.87.87.9
134	10.87.87.10/31	10.87.87.10 – 10.87.87.11	10.87.87.11
135	10.87.87.12/31	10.87.87.12 – 10.87.87.13	10.87.87.13
136	10.87.87.14/31	10.87.87.14 – 10.87.87.15	10.87.87.15
137	10.87.87.16/31	10.87.87.16 – 10.87.87.17	10.87.87.17
138	10.87.87.18/31	10.87.87.18 – 10.87.87.19	10.87.87.19
139	10.87.87.20/31	10.87.87.20 – 10.87.87.21	10.87.87.21
140	10.87.87.22/31	10.87.87.22 – 10.87.87.23	10.87.87.23
141	10.87.87.24/31	10.87.87.24 – 10.87.87.25	10.87.87.25
142	10.87.87.26/31	10.87.87.26 – 10.87.87.27	10.87.87.27
143	10.87.87.28/31	10.87.87.28 – 10.87.87.29	10.87.87.29
144	10.87.87.30/31	10.87.87.30 – 10.87.87.31	10.87.87.31
145	10.87.87.32/31	10.87.87.32 – 10.87.87.33	10.87.87.33
146	10.87.87.34/31	10.87.87.34 – 10.87.87.35	10.87.87.35
147	10.87.87.36/31	10.87.87.36 – 10.87.87.37	10.87.87.37
148	10.87.87.38/31	10.87.87.38 – 10.87.87.39	10.87.87.39
149	10.87.87.40/31	10.87.87.40 – 10.87.87.41	10.87.87.41
150	10.87.87.42/31	10.87.87.42 – 10.87.87.43	10.87.87.43
151	10.87.87.44/31	10.87.87.44 – 10.87.87.45	10.87.87.45
152	10.87.87.46/31	10.87.87.46 – 10.87.87.47	10.87.87.47
153	10.87.87.48/31	10.87.87.48 – 10.87.87.49	10.87.87.49
154	10.87.87.50/31	10.87.87.50 – 10.87.87.51	10.87.87.51
155	10.87.87.52/31	10.87.87.52 – 10.87.87.53	10.87.87.53
156	10.87.87.54/31	10.87.87.54 – 10.87.87.55	10.87.87.55
157	10.87.87.56/31	10.87.87.56 – 10.87.87.57	10.87.87.57
158	10.87.87.58/31	10.87.87.58 – 10.87.87.59	10.87.87.59
159	10.87.87.60/31	10.87.87.60 – 10.87.87.61	10.87.87.61
160	10.87.87.62/31	10.87.87.62 – 10.87.87.63	10.87.87.63
161	10.87.87.64/31	10.87.87.64 – 10.87.87.65	10.87.87.65
162	10.87.87.66/31	10.87.87.66 – 10.87.87.67	10.87.87.67
163	10.87.87.68/31	10.87.87.68 – 10.87.87.69	10.87.87.69
164	10.87.87.70/31	10.87.87.70 – 10.87.87.71	10.87.87.71
165	10.87.87.72/31	10.87.87.72 – 10.87.87.73	10.87.87.73
166	10.87.87.74/31	10.87.87.74 – 10.87.87.75	10.87.87.75
167	10.87.87.76/31	10.87.87.76 – 10.87.87.77	10.87.87.77
168	10.87.87.78/31	10.87.87.78 – 10.87.87.79	10.87.87.79
169	10.87.87.80/31	10.87.87.80 – 10.87.87.81	10.87.87.81
170	10.87.87.82/31	10.87.87.82 – 10.87.87.83	10.87.87.83
171	10.87.87.84/31	10.87.87.84 – 10.87.87.85	10.87.87.85
172	10.87.87.86/31	10.87.87.86 – 10.87.87.87	10.87.87.87
173	10.87.87.88/31	10.87.87.88 – 10.87.87.89	10.87.87.89
174	10.87.87.90/31	10.87.87.90 – 10.87.87.91	10.87.87.91
175	10.87.87.92/31	10.87.87.92 – 10.87.87.93	10.87.87.93
176	10.87.87.94/31	10.87.87.94 – 10.87.87.95	10.87.87.95
177	10.87.87.96/31	10.87.87.96 – 10.87.87.97	10.87.87.97
178	10.87.87.98/31	10.87.87.98 – 10.87.87.99	10.87.87.99
179	10.87.87.100/31	10.87.87.100 – 10.87.87.101	10.87.87.101
180	10.87.87.102/31	10.87.87.102 – 10.87.87.103	10.87.87.103
181	10.87.87.104/31	10.87.87.104 – 10.87.87.105	10.87.87.105
182	10.87.87.106/31	10.87.87.106 – 10.87.87.107	10.87.87.107
183	10.87.87.108/31	10.87.87.108 – 10.87.87.109	10.87.87.109
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186	10.87.87.114/31	10.87.87.114 – 10.87.87.115	10.87.87.115
187	10.87.87.116/31	10.87.87.116 – 10.87.87.117	10.87.87.117
188	10.87.87.118/31	10.87.87.118 – 10.87.87.119	10.87.87.119
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190	10.87.87.122/31	10.87.87.122 – 10.87.87.123	10.87.87.123
191	10.87.87.124/31	10.87.87.124 – 10.87.87.125	10.87.87.125
192	10.87.87.126/31	10.87.87.126 – 10.87.87.127	10.87.87.127
193	10.87.87.128/31	10.87.87.128 – 10.87.87.129	10.87.87.129
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196	10.87.87.134/31	10.87.87.134 – 10.87.87.135	10.87.87.135
197	10.87.87.136/31	10.87.87.136 – 10.87.87.137	10.87.87.137
198	10.87.87.138/31	10.87.87.138 – 10.87.87.139	10.87.87.139
199	10.87.87.140/31	10.87.87.140 – 10.87.87.141	10.87.87.141
200	10.87.87.142/31	10.87.87.142 – 10.87.87.143	10.87.87.143
201	10.87.87.144/31	10.87.87.144 – 10.87.87.145	10.87.87.145
202	10.87.87.146/31	10.87.87.146 – 10.87.87.147	10.87.87.147
203	10.87.87.148/31	10.87.87.148 – 10.87.87.149	10.87.87.149
204	10.87.87.150/31	10.87.87.150 – 10.87.87.151	10.87.87.151
205	10.87.87.152/31	10.87.87.152 – 10.87.87.153	10.87.87.153
206	10.87.87.154/31	10.87.87.154 – 10.87.87.155	10.87.87.155
207	10.87.87.156/31	10.87.87.156 – 10.87.87.157	10.87.87.157
208	10.87.87.158/31	10.87.87.158 – 10.87.87.159	10.87.87.159
209	10.87.87.160/31	10.87.87.160 – 10.87.87.161	10.87.87.161
210	10.87.87.162/31	10.87.87.162 – 10.87.87.163	10.87.87.163
211	10.87.87.164/31	10.87.87.164 – 10.87.87.165	10.87.87.165
212	10.87.87.166/31	10.87.87.166 – 10.87.87.167	10.87.87.167
213	10.87.87.168/31	10.87.87.168 – 10.87.87.169	10.87.87.169
214	10.87.87.170/31	10.87.87.170 – 10.87.87.171	10.87.87.171
215	10.87.87.172/31	10.87.87.172 – 10.87.87.173	10.87.87.173
216	10.87.87.174/31	10.87.87.174 – 10.87.87.175	10.87.87.175
217	10.87.87.176/31	10.87.87.176 – 10.87.87.177	10.87.87.177
218	10.87.87.178/31	10.87.87.178 – 10.87.87.179	10.87.87.179
219	10.87.87.180/31	10.87.87.180 – 10.87.87.181	10.87.87.181
220	10.87.87.182/31	10.87.87.182 – 10.87.87.183	10.87.87.183
221	10.87.87.184/31	10.87.87.184 – 10.87.87.185	10.87.87.185
222	10.87.87.186/31	10.87.87.186 – 10.87.87.187	10.87.87.187
223	10.87.87.188/31	10.87.87.188 – 10.87.87.189	10.87.87.189
224	10.87.87.190/31	10.87.87.190 – 10.87.87.191	10.87.87.191
225	10.87.87.192/31	10.87.87.192 – 10.87.87.193	10.87.87.193
226	10.87.87.194/31	10.87.87.194 – 10.87.87.195	10.87.87.195
227	10.87.87.196/31	10.87.87.196 – 10.87.87.197	10.87.87.197
228	10.87.87.198/31	10.87.87.198 – 10.87.87.199	10.87.87.199
229	10.87.87.200/31	10.87.87.200 – 10.87.87.201	10.87.87.201
230	10.87.87.202/31	10.87.87.202 – 10.87.87.203	10.87.87.203
231	10.87.87.204/31	10.87.87.204 – 10.87.87.205	10.87.87.205
232	10.87.87.206/31	10.87.87.206 – 10.87.87.207	10.87.87.207
233	10.87.87.208/31	10.87.87.208 – 10.87.87.209	10.87.87.209
234	10.87.87.210/31	10.87.87.210 – 10.87.87.211	10.87.87.211
235	10.87.87.212/31	10.87.87.212 – 10.87.87.213	10.87.87.213
236	10.87.87.214/31	10.87.87.214 – 10.87.87.215	10.87.87.215
237	10.87.87.216/31	10.87.87.216 – 10.87.87.217	10.87.87.217
238	10.87.87.218/31	10.87.87.218 – 10.87.87.219	10.87.87.219
239	10.87.87.220/31	10.87.87.220 – 10.87.87.221	10.87.87.221
240	10.87.87.222/31	10.87.87.222 – 10.87.87.223	10.87.87.223
241	10.87.87.224/31	10.87.87.224 – 10.87.87.225	10.87.87.225
242	10.87.87.226/31	10.87.87.226 – 10.87.87.227	10.87.87.227
243	10.87.87.228/31	10.87.87.228 – 10.87.87.229	10.87.87.229
244	10.87.87.230/31	10.87.87.230 – 10.87.87.231	10.87.87.231
245	10.87.87.232/31	10.87.87.232 – 10.87.87.233	10.87.87.233
246	10.87.87.234/31	10.87.87.234 – 10.87.87.235	10.87.87.235
247	10.87.87.236/31	10.87.87.236 – 10.87.87.237	10.87.87.237
248	10.87.87.238/31	10.87.87.238 – 10.87.87.239	10.87.87.239
249	10.87.87.240/31	10.87.87.240 – 10.87.87.241	10.87.87.241
250	10.87.87.242/31	10.87.87.242 – 10.87.87.243	10.87.87.243
251	10.87.87.244/31	10.87.87.244 – 10.87.87.245	10.87.87.245
252	10.87.87.246/31	10.87.87.246 – 10.87.87.247	10.87.87.247
253	10.87.87.248/31	10.87.87.248 – 10.87.87.249	10.87.87.249
254	10.87.87.250/31	10.87.87.250 – 10.87.87.251	10.87.87.251
255	10.87.87.252/31	10.87.87.252 – 10.87.87.253	10.87.87.253
256	10.87.87.254/31	10.87.87.254 – 10.87.87.255	10.87.87.255

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