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)10.72.26.0/23

network10.72.26.0/23

broadcast10.72.27.255

first host10.72.26.1

last host10.72.27.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.72.26.0/23

address00001010.01001000.00011010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001000.00011010.00000000

broadcast00001010.01001000.00011011.11111111

green = network part, grey = host part

hex0x0a481a00

decimal172497408

reverse dns0.26.72.10.in-addr.arpa

ipv4-mapped::ffff:a48:1a00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.72.26.0/31	10.72.26.0 – 10.72.26.1	10.72.26.1
2	10.72.26.2/31	10.72.26.2 – 10.72.26.3	10.72.26.3
3	10.72.26.4/31	10.72.26.4 – 10.72.26.5	10.72.26.5
4	10.72.26.6/31	10.72.26.6 – 10.72.26.7	10.72.26.7
5	10.72.26.8/31	10.72.26.8 – 10.72.26.9	10.72.26.9
6	10.72.26.10/31	10.72.26.10 – 10.72.26.11	10.72.26.11
7	10.72.26.12/31	10.72.26.12 – 10.72.26.13	10.72.26.13
8	10.72.26.14/31	10.72.26.14 – 10.72.26.15	10.72.26.15
9	10.72.26.16/31	10.72.26.16 – 10.72.26.17	10.72.26.17
10	10.72.26.18/31	10.72.26.18 – 10.72.26.19	10.72.26.19
11	10.72.26.20/31	10.72.26.20 – 10.72.26.21	10.72.26.21
12	10.72.26.22/31	10.72.26.22 – 10.72.26.23	10.72.26.23
13	10.72.26.24/31	10.72.26.24 – 10.72.26.25	10.72.26.25
14	10.72.26.26/31	10.72.26.26 – 10.72.26.27	10.72.26.27
15	10.72.26.28/31	10.72.26.28 – 10.72.26.29	10.72.26.29
16	10.72.26.30/31	10.72.26.30 – 10.72.26.31	10.72.26.31
17	10.72.26.32/31	10.72.26.32 – 10.72.26.33	10.72.26.33
18	10.72.26.34/31	10.72.26.34 – 10.72.26.35	10.72.26.35
19	10.72.26.36/31	10.72.26.36 – 10.72.26.37	10.72.26.37
20	10.72.26.38/31	10.72.26.38 – 10.72.26.39	10.72.26.39
21	10.72.26.40/31	10.72.26.40 – 10.72.26.41	10.72.26.41
22	10.72.26.42/31	10.72.26.42 – 10.72.26.43	10.72.26.43
23	10.72.26.44/31	10.72.26.44 – 10.72.26.45	10.72.26.45
24	10.72.26.46/31	10.72.26.46 – 10.72.26.47	10.72.26.47
25	10.72.26.48/31	10.72.26.48 – 10.72.26.49	10.72.26.49
26	10.72.26.50/31	10.72.26.50 – 10.72.26.51	10.72.26.51
27	10.72.26.52/31	10.72.26.52 – 10.72.26.53	10.72.26.53
28	10.72.26.54/31	10.72.26.54 – 10.72.26.55	10.72.26.55
29	10.72.26.56/31	10.72.26.56 – 10.72.26.57	10.72.26.57
30	10.72.26.58/31	10.72.26.58 – 10.72.26.59	10.72.26.59
31	10.72.26.60/31	10.72.26.60 – 10.72.26.61	10.72.26.61
32	10.72.26.62/31	10.72.26.62 – 10.72.26.63	10.72.26.63
33	10.72.26.64/31	10.72.26.64 – 10.72.26.65	10.72.26.65
34	10.72.26.66/31	10.72.26.66 – 10.72.26.67	10.72.26.67
35	10.72.26.68/31	10.72.26.68 – 10.72.26.69	10.72.26.69
36	10.72.26.70/31	10.72.26.70 – 10.72.26.71	10.72.26.71
37	10.72.26.72/31	10.72.26.72 – 10.72.26.73	10.72.26.73
38	10.72.26.74/31	10.72.26.74 – 10.72.26.75	10.72.26.75
39	10.72.26.76/31	10.72.26.76 – 10.72.26.77	10.72.26.77
40	10.72.26.78/31	10.72.26.78 – 10.72.26.79	10.72.26.79
41	10.72.26.80/31	10.72.26.80 – 10.72.26.81	10.72.26.81
42	10.72.26.82/31	10.72.26.82 – 10.72.26.83	10.72.26.83
43	10.72.26.84/31	10.72.26.84 – 10.72.26.85	10.72.26.85
44	10.72.26.86/31	10.72.26.86 – 10.72.26.87	10.72.26.87
45	10.72.26.88/31	10.72.26.88 – 10.72.26.89	10.72.26.89
46	10.72.26.90/31	10.72.26.90 – 10.72.26.91	10.72.26.91
47	10.72.26.92/31	10.72.26.92 – 10.72.26.93	10.72.26.93
48	10.72.26.94/31	10.72.26.94 – 10.72.26.95	10.72.26.95
49	10.72.26.96/31	10.72.26.96 – 10.72.26.97	10.72.26.97
50	10.72.26.98/31	10.72.26.98 – 10.72.26.99	10.72.26.99
51	10.72.26.100/31	10.72.26.100 – 10.72.26.101	10.72.26.101
52	10.72.26.102/31	10.72.26.102 – 10.72.26.103	10.72.26.103
53	10.72.26.104/31	10.72.26.104 – 10.72.26.105	10.72.26.105
54	10.72.26.106/31	10.72.26.106 – 10.72.26.107	10.72.26.107
55	10.72.26.108/31	10.72.26.108 – 10.72.26.109	10.72.26.109
56	10.72.26.110/31	10.72.26.110 – 10.72.26.111	10.72.26.111
57	10.72.26.112/31	10.72.26.112 – 10.72.26.113	10.72.26.113
58	10.72.26.114/31	10.72.26.114 – 10.72.26.115	10.72.26.115
59	10.72.26.116/31	10.72.26.116 – 10.72.26.117	10.72.26.117
60	10.72.26.118/31	10.72.26.118 – 10.72.26.119	10.72.26.119
61	10.72.26.120/31	10.72.26.120 – 10.72.26.121	10.72.26.121
62	10.72.26.122/31	10.72.26.122 – 10.72.26.123	10.72.26.123
63	10.72.26.124/31	10.72.26.124 – 10.72.26.125	10.72.26.125
64	10.72.26.126/31	10.72.26.126 – 10.72.26.127	10.72.26.127
65	10.72.26.128/31	10.72.26.128 – 10.72.26.129	10.72.26.129
66	10.72.26.130/31	10.72.26.130 – 10.72.26.131	10.72.26.131
67	10.72.26.132/31	10.72.26.132 – 10.72.26.133	10.72.26.133
68	10.72.26.134/31	10.72.26.134 – 10.72.26.135	10.72.26.135
69	10.72.26.136/31	10.72.26.136 – 10.72.26.137	10.72.26.137
70	10.72.26.138/31	10.72.26.138 – 10.72.26.139	10.72.26.139
71	10.72.26.140/31	10.72.26.140 – 10.72.26.141	10.72.26.141
72	10.72.26.142/31	10.72.26.142 – 10.72.26.143	10.72.26.143
73	10.72.26.144/31	10.72.26.144 – 10.72.26.145	10.72.26.145
74	10.72.26.146/31	10.72.26.146 – 10.72.26.147	10.72.26.147
75	10.72.26.148/31	10.72.26.148 – 10.72.26.149	10.72.26.149
76	10.72.26.150/31	10.72.26.150 – 10.72.26.151	10.72.26.151
77	10.72.26.152/31	10.72.26.152 – 10.72.26.153	10.72.26.153
78	10.72.26.154/31	10.72.26.154 – 10.72.26.155	10.72.26.155
79	10.72.26.156/31	10.72.26.156 – 10.72.26.157	10.72.26.157
80	10.72.26.158/31	10.72.26.158 – 10.72.26.159	10.72.26.159
81	10.72.26.160/31	10.72.26.160 – 10.72.26.161	10.72.26.161
82	10.72.26.162/31	10.72.26.162 – 10.72.26.163	10.72.26.163
83	10.72.26.164/31	10.72.26.164 – 10.72.26.165	10.72.26.165
84	10.72.26.166/31	10.72.26.166 – 10.72.26.167	10.72.26.167
85	10.72.26.168/31	10.72.26.168 – 10.72.26.169	10.72.26.169
86	10.72.26.170/31	10.72.26.170 – 10.72.26.171	10.72.26.171
87	10.72.26.172/31	10.72.26.172 – 10.72.26.173	10.72.26.173
88	10.72.26.174/31	10.72.26.174 – 10.72.26.175	10.72.26.175
89	10.72.26.176/31	10.72.26.176 – 10.72.26.177	10.72.26.177
90	10.72.26.178/31	10.72.26.178 – 10.72.26.179	10.72.26.179
91	10.72.26.180/31	10.72.26.180 – 10.72.26.181	10.72.26.181
92	10.72.26.182/31	10.72.26.182 – 10.72.26.183	10.72.26.183
93	10.72.26.184/31	10.72.26.184 – 10.72.26.185	10.72.26.185
94	10.72.26.186/31	10.72.26.186 – 10.72.26.187	10.72.26.187
95	10.72.26.188/31	10.72.26.188 – 10.72.26.189	10.72.26.189
96	10.72.26.190/31	10.72.26.190 – 10.72.26.191	10.72.26.191
97	10.72.26.192/31	10.72.26.192 – 10.72.26.193	10.72.26.193
98	10.72.26.194/31	10.72.26.194 – 10.72.26.195	10.72.26.195
99	10.72.26.196/31	10.72.26.196 – 10.72.26.197	10.72.26.197
100	10.72.26.198/31	10.72.26.198 – 10.72.26.199	10.72.26.199
101	10.72.26.200/31	10.72.26.200 – 10.72.26.201	10.72.26.201
102	10.72.26.202/31	10.72.26.202 – 10.72.26.203	10.72.26.203
103	10.72.26.204/31	10.72.26.204 – 10.72.26.205	10.72.26.205
104	10.72.26.206/31	10.72.26.206 – 10.72.26.207	10.72.26.207
105	10.72.26.208/31	10.72.26.208 – 10.72.26.209	10.72.26.209
106	10.72.26.210/31	10.72.26.210 – 10.72.26.211	10.72.26.211
107	10.72.26.212/31	10.72.26.212 – 10.72.26.213	10.72.26.213
108	10.72.26.214/31	10.72.26.214 – 10.72.26.215	10.72.26.215
109	10.72.26.216/31	10.72.26.216 – 10.72.26.217	10.72.26.217
110	10.72.26.218/31	10.72.26.218 – 10.72.26.219	10.72.26.219
111	10.72.26.220/31	10.72.26.220 – 10.72.26.221	10.72.26.221
112	10.72.26.222/31	10.72.26.222 – 10.72.26.223	10.72.26.223
113	10.72.26.224/31	10.72.26.224 – 10.72.26.225	10.72.26.225
114	10.72.26.226/31	10.72.26.226 – 10.72.26.227	10.72.26.227
115	10.72.26.228/31	10.72.26.228 – 10.72.26.229	10.72.26.229
116	10.72.26.230/31	10.72.26.230 – 10.72.26.231	10.72.26.231
117	10.72.26.232/31	10.72.26.232 – 10.72.26.233	10.72.26.233
118	10.72.26.234/31	10.72.26.234 – 10.72.26.235	10.72.26.235
119	10.72.26.236/31	10.72.26.236 – 10.72.26.237	10.72.26.237
120	10.72.26.238/31	10.72.26.238 – 10.72.26.239	10.72.26.239
121	10.72.26.240/31	10.72.26.240 – 10.72.26.241	10.72.26.241
122	10.72.26.242/31	10.72.26.242 – 10.72.26.243	10.72.26.243
123	10.72.26.244/31	10.72.26.244 – 10.72.26.245	10.72.26.245
124	10.72.26.246/31	10.72.26.246 – 10.72.26.247	10.72.26.247
125	10.72.26.248/31	10.72.26.248 – 10.72.26.249	10.72.26.249
126	10.72.26.250/31	10.72.26.250 – 10.72.26.251	10.72.26.251
127	10.72.26.252/31	10.72.26.252 – 10.72.26.253	10.72.26.253
128	10.72.26.254/31	10.72.26.254 – 10.72.26.255	10.72.26.255
129	10.72.27.0/31	10.72.27.0 – 10.72.27.1	10.72.27.1
130	10.72.27.2/31	10.72.27.2 – 10.72.27.3	10.72.27.3
131	10.72.27.4/31	10.72.27.4 – 10.72.27.5	10.72.27.5
132	10.72.27.6/31	10.72.27.6 – 10.72.27.7	10.72.27.7
133	10.72.27.8/31	10.72.27.8 – 10.72.27.9	10.72.27.9
134	10.72.27.10/31	10.72.27.10 – 10.72.27.11	10.72.27.11
135	10.72.27.12/31	10.72.27.12 – 10.72.27.13	10.72.27.13
136	10.72.27.14/31	10.72.27.14 – 10.72.27.15	10.72.27.15
137	10.72.27.16/31	10.72.27.16 – 10.72.27.17	10.72.27.17
138	10.72.27.18/31	10.72.27.18 – 10.72.27.19	10.72.27.19
139	10.72.27.20/31	10.72.27.20 – 10.72.27.21	10.72.27.21
140	10.72.27.22/31	10.72.27.22 – 10.72.27.23	10.72.27.23
141	10.72.27.24/31	10.72.27.24 – 10.72.27.25	10.72.27.25
142	10.72.27.26/31	10.72.27.26 – 10.72.27.27	10.72.27.27
143	10.72.27.28/31	10.72.27.28 – 10.72.27.29	10.72.27.29
144	10.72.27.30/31	10.72.27.30 – 10.72.27.31	10.72.27.31
145	10.72.27.32/31	10.72.27.32 – 10.72.27.33	10.72.27.33
146	10.72.27.34/31	10.72.27.34 – 10.72.27.35	10.72.27.35
147	10.72.27.36/31	10.72.27.36 – 10.72.27.37	10.72.27.37
148	10.72.27.38/31	10.72.27.38 – 10.72.27.39	10.72.27.39
149	10.72.27.40/31	10.72.27.40 – 10.72.27.41	10.72.27.41
150	10.72.27.42/31	10.72.27.42 – 10.72.27.43	10.72.27.43
151	10.72.27.44/31	10.72.27.44 – 10.72.27.45	10.72.27.45
152	10.72.27.46/31	10.72.27.46 – 10.72.27.47	10.72.27.47
153	10.72.27.48/31	10.72.27.48 – 10.72.27.49	10.72.27.49
154	10.72.27.50/31	10.72.27.50 – 10.72.27.51	10.72.27.51
155	10.72.27.52/31	10.72.27.52 – 10.72.27.53	10.72.27.53
156	10.72.27.54/31	10.72.27.54 – 10.72.27.55	10.72.27.55
157	10.72.27.56/31	10.72.27.56 – 10.72.27.57	10.72.27.57
158	10.72.27.58/31	10.72.27.58 – 10.72.27.59	10.72.27.59
159	10.72.27.60/31	10.72.27.60 – 10.72.27.61	10.72.27.61
160	10.72.27.62/31	10.72.27.62 – 10.72.27.63	10.72.27.63
161	10.72.27.64/31	10.72.27.64 – 10.72.27.65	10.72.27.65
162	10.72.27.66/31	10.72.27.66 – 10.72.27.67	10.72.27.67
163	10.72.27.68/31	10.72.27.68 – 10.72.27.69	10.72.27.69
164	10.72.27.70/31	10.72.27.70 – 10.72.27.71	10.72.27.71
165	10.72.27.72/31	10.72.27.72 – 10.72.27.73	10.72.27.73
166	10.72.27.74/31	10.72.27.74 – 10.72.27.75	10.72.27.75
167	10.72.27.76/31	10.72.27.76 – 10.72.27.77	10.72.27.77
168	10.72.27.78/31	10.72.27.78 – 10.72.27.79	10.72.27.79
169	10.72.27.80/31	10.72.27.80 – 10.72.27.81	10.72.27.81
170	10.72.27.82/31	10.72.27.82 – 10.72.27.83	10.72.27.83
171	10.72.27.84/31	10.72.27.84 – 10.72.27.85	10.72.27.85
172	10.72.27.86/31	10.72.27.86 – 10.72.27.87	10.72.27.87
173	10.72.27.88/31	10.72.27.88 – 10.72.27.89	10.72.27.89
174	10.72.27.90/31	10.72.27.90 – 10.72.27.91	10.72.27.91
175	10.72.27.92/31	10.72.27.92 – 10.72.27.93	10.72.27.93
176	10.72.27.94/31	10.72.27.94 – 10.72.27.95	10.72.27.95
177	10.72.27.96/31	10.72.27.96 – 10.72.27.97	10.72.27.97
178	10.72.27.98/31	10.72.27.98 – 10.72.27.99	10.72.27.99
179	10.72.27.100/31	10.72.27.100 – 10.72.27.101	10.72.27.101
180	10.72.27.102/31	10.72.27.102 – 10.72.27.103	10.72.27.103
181	10.72.27.104/31	10.72.27.104 – 10.72.27.105	10.72.27.105
182	10.72.27.106/31	10.72.27.106 – 10.72.27.107	10.72.27.107
183	10.72.27.108/31	10.72.27.108 – 10.72.27.109	10.72.27.109
184	10.72.27.110/31	10.72.27.110 – 10.72.27.111	10.72.27.111
185	10.72.27.112/31	10.72.27.112 – 10.72.27.113	10.72.27.113
186	10.72.27.114/31	10.72.27.114 – 10.72.27.115	10.72.27.115
187	10.72.27.116/31	10.72.27.116 – 10.72.27.117	10.72.27.117
188	10.72.27.118/31	10.72.27.118 – 10.72.27.119	10.72.27.119
189	10.72.27.120/31	10.72.27.120 – 10.72.27.121	10.72.27.121
190	10.72.27.122/31	10.72.27.122 – 10.72.27.123	10.72.27.123
191	10.72.27.124/31	10.72.27.124 – 10.72.27.125	10.72.27.125
192	10.72.27.126/31	10.72.27.126 – 10.72.27.127	10.72.27.127
193	10.72.27.128/31	10.72.27.128 – 10.72.27.129	10.72.27.129
194	10.72.27.130/31	10.72.27.130 – 10.72.27.131	10.72.27.131
195	10.72.27.132/31	10.72.27.132 – 10.72.27.133	10.72.27.133
196	10.72.27.134/31	10.72.27.134 – 10.72.27.135	10.72.27.135
197	10.72.27.136/31	10.72.27.136 – 10.72.27.137	10.72.27.137
198	10.72.27.138/31	10.72.27.138 – 10.72.27.139	10.72.27.139
199	10.72.27.140/31	10.72.27.140 – 10.72.27.141	10.72.27.141
200	10.72.27.142/31	10.72.27.142 – 10.72.27.143	10.72.27.143
201	10.72.27.144/31	10.72.27.144 – 10.72.27.145	10.72.27.145
202	10.72.27.146/31	10.72.27.146 – 10.72.27.147	10.72.27.147
203	10.72.27.148/31	10.72.27.148 – 10.72.27.149	10.72.27.149
204	10.72.27.150/31	10.72.27.150 – 10.72.27.151	10.72.27.151
205	10.72.27.152/31	10.72.27.152 – 10.72.27.153	10.72.27.153
206	10.72.27.154/31	10.72.27.154 – 10.72.27.155	10.72.27.155
207	10.72.27.156/31	10.72.27.156 – 10.72.27.157	10.72.27.157
208	10.72.27.158/31	10.72.27.158 – 10.72.27.159	10.72.27.159
209	10.72.27.160/31	10.72.27.160 – 10.72.27.161	10.72.27.161
210	10.72.27.162/31	10.72.27.162 – 10.72.27.163	10.72.27.163
211	10.72.27.164/31	10.72.27.164 – 10.72.27.165	10.72.27.165
212	10.72.27.166/31	10.72.27.166 – 10.72.27.167	10.72.27.167
213	10.72.27.168/31	10.72.27.168 – 10.72.27.169	10.72.27.169
214	10.72.27.170/31	10.72.27.170 – 10.72.27.171	10.72.27.171
215	10.72.27.172/31	10.72.27.172 – 10.72.27.173	10.72.27.173
216	10.72.27.174/31	10.72.27.174 – 10.72.27.175	10.72.27.175
217	10.72.27.176/31	10.72.27.176 – 10.72.27.177	10.72.27.177
218	10.72.27.178/31	10.72.27.178 – 10.72.27.179	10.72.27.179
219	10.72.27.180/31	10.72.27.180 – 10.72.27.181	10.72.27.181
220	10.72.27.182/31	10.72.27.182 – 10.72.27.183	10.72.27.183
221	10.72.27.184/31	10.72.27.184 – 10.72.27.185	10.72.27.185
222	10.72.27.186/31	10.72.27.186 – 10.72.27.187	10.72.27.187
223	10.72.27.188/31	10.72.27.188 – 10.72.27.189	10.72.27.189
224	10.72.27.190/31	10.72.27.190 – 10.72.27.191	10.72.27.191
225	10.72.27.192/31	10.72.27.192 – 10.72.27.193	10.72.27.193
226	10.72.27.194/31	10.72.27.194 – 10.72.27.195	10.72.27.195
227	10.72.27.196/31	10.72.27.196 – 10.72.27.197	10.72.27.197
228	10.72.27.198/31	10.72.27.198 – 10.72.27.199	10.72.27.199
229	10.72.27.200/31	10.72.27.200 – 10.72.27.201	10.72.27.201
230	10.72.27.202/31	10.72.27.202 – 10.72.27.203	10.72.27.203
231	10.72.27.204/31	10.72.27.204 – 10.72.27.205	10.72.27.205
232	10.72.27.206/31	10.72.27.206 – 10.72.27.207	10.72.27.207
233	10.72.27.208/31	10.72.27.208 – 10.72.27.209	10.72.27.209
234	10.72.27.210/31	10.72.27.210 – 10.72.27.211	10.72.27.211
235	10.72.27.212/31	10.72.27.212 – 10.72.27.213	10.72.27.213
236	10.72.27.214/31	10.72.27.214 – 10.72.27.215	10.72.27.215
237	10.72.27.216/31	10.72.27.216 – 10.72.27.217	10.72.27.217
238	10.72.27.218/31	10.72.27.218 – 10.72.27.219	10.72.27.219
239	10.72.27.220/31	10.72.27.220 – 10.72.27.221	10.72.27.221
240	10.72.27.222/31	10.72.27.222 – 10.72.27.223	10.72.27.223
241	10.72.27.224/31	10.72.27.224 – 10.72.27.225	10.72.27.225
242	10.72.27.226/31	10.72.27.226 – 10.72.27.227	10.72.27.227
243	10.72.27.228/31	10.72.27.228 – 10.72.27.229	10.72.27.229
244	10.72.27.230/31	10.72.27.230 – 10.72.27.231	10.72.27.231
245	10.72.27.232/31	10.72.27.232 – 10.72.27.233	10.72.27.233
246	10.72.27.234/31	10.72.27.234 – 10.72.27.235	10.72.27.235
247	10.72.27.236/31	10.72.27.236 – 10.72.27.237	10.72.27.237
248	10.72.27.238/31	10.72.27.238 – 10.72.27.239	10.72.27.239
249	10.72.27.240/31	10.72.27.240 – 10.72.27.241	10.72.27.241
250	10.72.27.242/31	10.72.27.242 – 10.72.27.243	10.72.27.243
251	10.72.27.244/31	10.72.27.244 – 10.72.27.245	10.72.27.245
252	10.72.27.246/31	10.72.27.246 – 10.72.27.247	10.72.27.247
253	10.72.27.248/31	10.72.27.248 – 10.72.27.249	10.72.27.249
254	10.72.27.250/31	10.72.27.250 – 10.72.27.251	10.72.27.251
255	10.72.27.252/31	10.72.27.252 – 10.72.27.253	10.72.27.253
256	10.72.27.254/31	10.72.27.254 – 10.72.27.255	10.72.27.255

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 →