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)10.0.244.0/23

network10.0.244.0/23

broadcast10.0.245.255

first host10.0.244.1

last host10.0.245.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.244.0/23

address00001010.00000000.11110100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.11110100.00000000

broadcast00001010.00000000.11110101.11111111

green = network part, grey = host part

hex0x0a00f400

decimal167834624

reverse dns0.244.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:f400

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.244.0/31	10.0.244.0 – 10.0.244.1	10.0.244.1
2	10.0.244.2/31	10.0.244.2 – 10.0.244.3	10.0.244.3
3	10.0.244.4/31	10.0.244.4 – 10.0.244.5	10.0.244.5
4	10.0.244.6/31	10.0.244.6 – 10.0.244.7	10.0.244.7
5	10.0.244.8/31	10.0.244.8 – 10.0.244.9	10.0.244.9
6	10.0.244.10/31	10.0.244.10 – 10.0.244.11	10.0.244.11
7	10.0.244.12/31	10.0.244.12 – 10.0.244.13	10.0.244.13
8	10.0.244.14/31	10.0.244.14 – 10.0.244.15	10.0.244.15
9	10.0.244.16/31	10.0.244.16 – 10.0.244.17	10.0.244.17
10	10.0.244.18/31	10.0.244.18 – 10.0.244.19	10.0.244.19
11	10.0.244.20/31	10.0.244.20 – 10.0.244.21	10.0.244.21
12	10.0.244.22/31	10.0.244.22 – 10.0.244.23	10.0.244.23
13	10.0.244.24/31	10.0.244.24 – 10.0.244.25	10.0.244.25
14	10.0.244.26/31	10.0.244.26 – 10.0.244.27	10.0.244.27
15	10.0.244.28/31	10.0.244.28 – 10.0.244.29	10.0.244.29
16	10.0.244.30/31	10.0.244.30 – 10.0.244.31	10.0.244.31
17	10.0.244.32/31	10.0.244.32 – 10.0.244.33	10.0.244.33
18	10.0.244.34/31	10.0.244.34 – 10.0.244.35	10.0.244.35
19	10.0.244.36/31	10.0.244.36 – 10.0.244.37	10.0.244.37
20	10.0.244.38/31	10.0.244.38 – 10.0.244.39	10.0.244.39
21	10.0.244.40/31	10.0.244.40 – 10.0.244.41	10.0.244.41
22	10.0.244.42/31	10.0.244.42 – 10.0.244.43	10.0.244.43
23	10.0.244.44/31	10.0.244.44 – 10.0.244.45	10.0.244.45
24	10.0.244.46/31	10.0.244.46 – 10.0.244.47	10.0.244.47
25	10.0.244.48/31	10.0.244.48 – 10.0.244.49	10.0.244.49
26	10.0.244.50/31	10.0.244.50 – 10.0.244.51	10.0.244.51
27	10.0.244.52/31	10.0.244.52 – 10.0.244.53	10.0.244.53
28	10.0.244.54/31	10.0.244.54 – 10.0.244.55	10.0.244.55
29	10.0.244.56/31	10.0.244.56 – 10.0.244.57	10.0.244.57
30	10.0.244.58/31	10.0.244.58 – 10.0.244.59	10.0.244.59
31	10.0.244.60/31	10.0.244.60 – 10.0.244.61	10.0.244.61
32	10.0.244.62/31	10.0.244.62 – 10.0.244.63	10.0.244.63
33	10.0.244.64/31	10.0.244.64 – 10.0.244.65	10.0.244.65
34	10.0.244.66/31	10.0.244.66 – 10.0.244.67	10.0.244.67
35	10.0.244.68/31	10.0.244.68 – 10.0.244.69	10.0.244.69
36	10.0.244.70/31	10.0.244.70 – 10.0.244.71	10.0.244.71
37	10.0.244.72/31	10.0.244.72 – 10.0.244.73	10.0.244.73
38	10.0.244.74/31	10.0.244.74 – 10.0.244.75	10.0.244.75
39	10.0.244.76/31	10.0.244.76 – 10.0.244.77	10.0.244.77
40	10.0.244.78/31	10.0.244.78 – 10.0.244.79	10.0.244.79
41	10.0.244.80/31	10.0.244.80 – 10.0.244.81	10.0.244.81
42	10.0.244.82/31	10.0.244.82 – 10.0.244.83	10.0.244.83
43	10.0.244.84/31	10.0.244.84 – 10.0.244.85	10.0.244.85
44	10.0.244.86/31	10.0.244.86 – 10.0.244.87	10.0.244.87
45	10.0.244.88/31	10.0.244.88 – 10.0.244.89	10.0.244.89
46	10.0.244.90/31	10.0.244.90 – 10.0.244.91	10.0.244.91
47	10.0.244.92/31	10.0.244.92 – 10.0.244.93	10.0.244.93
48	10.0.244.94/31	10.0.244.94 – 10.0.244.95	10.0.244.95
49	10.0.244.96/31	10.0.244.96 – 10.0.244.97	10.0.244.97
50	10.0.244.98/31	10.0.244.98 – 10.0.244.99	10.0.244.99
51	10.0.244.100/31	10.0.244.100 – 10.0.244.101	10.0.244.101
52	10.0.244.102/31	10.0.244.102 – 10.0.244.103	10.0.244.103
53	10.0.244.104/31	10.0.244.104 – 10.0.244.105	10.0.244.105
54	10.0.244.106/31	10.0.244.106 – 10.0.244.107	10.0.244.107
55	10.0.244.108/31	10.0.244.108 – 10.0.244.109	10.0.244.109
56	10.0.244.110/31	10.0.244.110 – 10.0.244.111	10.0.244.111
57	10.0.244.112/31	10.0.244.112 – 10.0.244.113	10.0.244.113
58	10.0.244.114/31	10.0.244.114 – 10.0.244.115	10.0.244.115
59	10.0.244.116/31	10.0.244.116 – 10.0.244.117	10.0.244.117
60	10.0.244.118/31	10.0.244.118 – 10.0.244.119	10.0.244.119
61	10.0.244.120/31	10.0.244.120 – 10.0.244.121	10.0.244.121
62	10.0.244.122/31	10.0.244.122 – 10.0.244.123	10.0.244.123
63	10.0.244.124/31	10.0.244.124 – 10.0.244.125	10.0.244.125
64	10.0.244.126/31	10.0.244.126 – 10.0.244.127	10.0.244.127
65	10.0.244.128/31	10.0.244.128 – 10.0.244.129	10.0.244.129
66	10.0.244.130/31	10.0.244.130 – 10.0.244.131	10.0.244.131
67	10.0.244.132/31	10.0.244.132 – 10.0.244.133	10.0.244.133
68	10.0.244.134/31	10.0.244.134 – 10.0.244.135	10.0.244.135
69	10.0.244.136/31	10.0.244.136 – 10.0.244.137	10.0.244.137
70	10.0.244.138/31	10.0.244.138 – 10.0.244.139	10.0.244.139
71	10.0.244.140/31	10.0.244.140 – 10.0.244.141	10.0.244.141
72	10.0.244.142/31	10.0.244.142 – 10.0.244.143	10.0.244.143
73	10.0.244.144/31	10.0.244.144 – 10.0.244.145	10.0.244.145
74	10.0.244.146/31	10.0.244.146 – 10.0.244.147	10.0.244.147
75	10.0.244.148/31	10.0.244.148 – 10.0.244.149	10.0.244.149
76	10.0.244.150/31	10.0.244.150 – 10.0.244.151	10.0.244.151
77	10.0.244.152/31	10.0.244.152 – 10.0.244.153	10.0.244.153
78	10.0.244.154/31	10.0.244.154 – 10.0.244.155	10.0.244.155
79	10.0.244.156/31	10.0.244.156 – 10.0.244.157	10.0.244.157
80	10.0.244.158/31	10.0.244.158 – 10.0.244.159	10.0.244.159
81	10.0.244.160/31	10.0.244.160 – 10.0.244.161	10.0.244.161
82	10.0.244.162/31	10.0.244.162 – 10.0.244.163	10.0.244.163
83	10.0.244.164/31	10.0.244.164 – 10.0.244.165	10.0.244.165
84	10.0.244.166/31	10.0.244.166 – 10.0.244.167	10.0.244.167
85	10.0.244.168/31	10.0.244.168 – 10.0.244.169	10.0.244.169
86	10.0.244.170/31	10.0.244.170 – 10.0.244.171	10.0.244.171
87	10.0.244.172/31	10.0.244.172 – 10.0.244.173	10.0.244.173
88	10.0.244.174/31	10.0.244.174 – 10.0.244.175	10.0.244.175
89	10.0.244.176/31	10.0.244.176 – 10.0.244.177	10.0.244.177
90	10.0.244.178/31	10.0.244.178 – 10.0.244.179	10.0.244.179
91	10.0.244.180/31	10.0.244.180 – 10.0.244.181	10.0.244.181
92	10.0.244.182/31	10.0.244.182 – 10.0.244.183	10.0.244.183
93	10.0.244.184/31	10.0.244.184 – 10.0.244.185	10.0.244.185
94	10.0.244.186/31	10.0.244.186 – 10.0.244.187	10.0.244.187
95	10.0.244.188/31	10.0.244.188 – 10.0.244.189	10.0.244.189
96	10.0.244.190/31	10.0.244.190 – 10.0.244.191	10.0.244.191
97	10.0.244.192/31	10.0.244.192 – 10.0.244.193	10.0.244.193
98	10.0.244.194/31	10.0.244.194 – 10.0.244.195	10.0.244.195
99	10.0.244.196/31	10.0.244.196 – 10.0.244.197	10.0.244.197
100	10.0.244.198/31	10.0.244.198 – 10.0.244.199	10.0.244.199
101	10.0.244.200/31	10.0.244.200 – 10.0.244.201	10.0.244.201
102	10.0.244.202/31	10.0.244.202 – 10.0.244.203	10.0.244.203
103	10.0.244.204/31	10.0.244.204 – 10.0.244.205	10.0.244.205
104	10.0.244.206/31	10.0.244.206 – 10.0.244.207	10.0.244.207
105	10.0.244.208/31	10.0.244.208 – 10.0.244.209	10.0.244.209
106	10.0.244.210/31	10.0.244.210 – 10.0.244.211	10.0.244.211
107	10.0.244.212/31	10.0.244.212 – 10.0.244.213	10.0.244.213
108	10.0.244.214/31	10.0.244.214 – 10.0.244.215	10.0.244.215
109	10.0.244.216/31	10.0.244.216 – 10.0.244.217	10.0.244.217
110	10.0.244.218/31	10.0.244.218 – 10.0.244.219	10.0.244.219
111	10.0.244.220/31	10.0.244.220 – 10.0.244.221	10.0.244.221
112	10.0.244.222/31	10.0.244.222 – 10.0.244.223	10.0.244.223
113	10.0.244.224/31	10.0.244.224 – 10.0.244.225	10.0.244.225
114	10.0.244.226/31	10.0.244.226 – 10.0.244.227	10.0.244.227
115	10.0.244.228/31	10.0.244.228 – 10.0.244.229	10.0.244.229
116	10.0.244.230/31	10.0.244.230 – 10.0.244.231	10.0.244.231
117	10.0.244.232/31	10.0.244.232 – 10.0.244.233	10.0.244.233
118	10.0.244.234/31	10.0.244.234 – 10.0.244.235	10.0.244.235
119	10.0.244.236/31	10.0.244.236 – 10.0.244.237	10.0.244.237
120	10.0.244.238/31	10.0.244.238 – 10.0.244.239	10.0.244.239
121	10.0.244.240/31	10.0.244.240 – 10.0.244.241	10.0.244.241
122	10.0.244.242/31	10.0.244.242 – 10.0.244.243	10.0.244.243
123	10.0.244.244/31	10.0.244.244 – 10.0.244.245	10.0.244.245
124	10.0.244.246/31	10.0.244.246 – 10.0.244.247	10.0.244.247
125	10.0.244.248/31	10.0.244.248 – 10.0.244.249	10.0.244.249
126	10.0.244.250/31	10.0.244.250 – 10.0.244.251	10.0.244.251
127	10.0.244.252/31	10.0.244.252 – 10.0.244.253	10.0.244.253
128	10.0.244.254/31	10.0.244.254 – 10.0.244.255	10.0.244.255
129	10.0.245.0/31	10.0.245.0 – 10.0.245.1	10.0.245.1
130	10.0.245.2/31	10.0.245.2 – 10.0.245.3	10.0.245.3
131	10.0.245.4/31	10.0.245.4 – 10.0.245.5	10.0.245.5
132	10.0.245.6/31	10.0.245.6 – 10.0.245.7	10.0.245.7
133	10.0.245.8/31	10.0.245.8 – 10.0.245.9	10.0.245.9
134	10.0.245.10/31	10.0.245.10 – 10.0.245.11	10.0.245.11
135	10.0.245.12/31	10.0.245.12 – 10.0.245.13	10.0.245.13
136	10.0.245.14/31	10.0.245.14 – 10.0.245.15	10.0.245.15
137	10.0.245.16/31	10.0.245.16 – 10.0.245.17	10.0.245.17
138	10.0.245.18/31	10.0.245.18 – 10.0.245.19	10.0.245.19
139	10.0.245.20/31	10.0.245.20 – 10.0.245.21	10.0.245.21
140	10.0.245.22/31	10.0.245.22 – 10.0.245.23	10.0.245.23
141	10.0.245.24/31	10.0.245.24 – 10.0.245.25	10.0.245.25
142	10.0.245.26/31	10.0.245.26 – 10.0.245.27	10.0.245.27
143	10.0.245.28/31	10.0.245.28 – 10.0.245.29	10.0.245.29
144	10.0.245.30/31	10.0.245.30 – 10.0.245.31	10.0.245.31
145	10.0.245.32/31	10.0.245.32 – 10.0.245.33	10.0.245.33
146	10.0.245.34/31	10.0.245.34 – 10.0.245.35	10.0.245.35
147	10.0.245.36/31	10.0.245.36 – 10.0.245.37	10.0.245.37
148	10.0.245.38/31	10.0.245.38 – 10.0.245.39	10.0.245.39
149	10.0.245.40/31	10.0.245.40 – 10.0.245.41	10.0.245.41
150	10.0.245.42/31	10.0.245.42 – 10.0.245.43	10.0.245.43
151	10.0.245.44/31	10.0.245.44 – 10.0.245.45	10.0.245.45
152	10.0.245.46/31	10.0.245.46 – 10.0.245.47	10.0.245.47
153	10.0.245.48/31	10.0.245.48 – 10.0.245.49	10.0.245.49
154	10.0.245.50/31	10.0.245.50 – 10.0.245.51	10.0.245.51
155	10.0.245.52/31	10.0.245.52 – 10.0.245.53	10.0.245.53
156	10.0.245.54/31	10.0.245.54 – 10.0.245.55	10.0.245.55
157	10.0.245.56/31	10.0.245.56 – 10.0.245.57	10.0.245.57
158	10.0.245.58/31	10.0.245.58 – 10.0.245.59	10.0.245.59
159	10.0.245.60/31	10.0.245.60 – 10.0.245.61	10.0.245.61
160	10.0.245.62/31	10.0.245.62 – 10.0.245.63	10.0.245.63
161	10.0.245.64/31	10.0.245.64 – 10.0.245.65	10.0.245.65
162	10.0.245.66/31	10.0.245.66 – 10.0.245.67	10.0.245.67
163	10.0.245.68/31	10.0.245.68 – 10.0.245.69	10.0.245.69
164	10.0.245.70/31	10.0.245.70 – 10.0.245.71	10.0.245.71
165	10.0.245.72/31	10.0.245.72 – 10.0.245.73	10.0.245.73
166	10.0.245.74/31	10.0.245.74 – 10.0.245.75	10.0.245.75
167	10.0.245.76/31	10.0.245.76 – 10.0.245.77	10.0.245.77
168	10.0.245.78/31	10.0.245.78 – 10.0.245.79	10.0.245.79
169	10.0.245.80/31	10.0.245.80 – 10.0.245.81	10.0.245.81
170	10.0.245.82/31	10.0.245.82 – 10.0.245.83	10.0.245.83
171	10.0.245.84/31	10.0.245.84 – 10.0.245.85	10.0.245.85
172	10.0.245.86/31	10.0.245.86 – 10.0.245.87	10.0.245.87
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174	10.0.245.90/31	10.0.245.90 – 10.0.245.91	10.0.245.91
175	10.0.245.92/31	10.0.245.92 – 10.0.245.93	10.0.245.93
176	10.0.245.94/31	10.0.245.94 – 10.0.245.95	10.0.245.95
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197	10.0.245.136/31	10.0.245.136 – 10.0.245.137	10.0.245.137
198	10.0.245.138/31	10.0.245.138 – 10.0.245.139	10.0.245.139
199	10.0.245.140/31	10.0.245.140 – 10.0.245.141	10.0.245.141
200	10.0.245.142/31	10.0.245.142 – 10.0.245.143	10.0.245.143
201	10.0.245.144/31	10.0.245.144 – 10.0.245.145	10.0.245.145
202	10.0.245.146/31	10.0.245.146 – 10.0.245.147	10.0.245.147
203	10.0.245.148/31	10.0.245.148 – 10.0.245.149	10.0.245.149
204	10.0.245.150/31	10.0.245.150 – 10.0.245.151	10.0.245.151
205	10.0.245.152/31	10.0.245.152 – 10.0.245.153	10.0.245.153
206	10.0.245.154/31	10.0.245.154 – 10.0.245.155	10.0.245.155
207	10.0.245.156/31	10.0.245.156 – 10.0.245.157	10.0.245.157
208	10.0.245.158/31	10.0.245.158 – 10.0.245.159	10.0.245.159
209	10.0.245.160/31	10.0.245.160 – 10.0.245.161	10.0.245.161
210	10.0.245.162/31	10.0.245.162 – 10.0.245.163	10.0.245.163
211	10.0.245.164/31	10.0.245.164 – 10.0.245.165	10.0.245.165
212	10.0.245.166/31	10.0.245.166 – 10.0.245.167	10.0.245.167
213	10.0.245.168/31	10.0.245.168 – 10.0.245.169	10.0.245.169
214	10.0.245.170/31	10.0.245.170 – 10.0.245.171	10.0.245.171
215	10.0.245.172/31	10.0.245.172 – 10.0.245.173	10.0.245.173
216	10.0.245.174/31	10.0.245.174 – 10.0.245.175	10.0.245.175
217	10.0.245.176/31	10.0.245.176 – 10.0.245.177	10.0.245.177
218	10.0.245.178/31	10.0.245.178 – 10.0.245.179	10.0.245.179
219	10.0.245.180/31	10.0.245.180 – 10.0.245.181	10.0.245.181
220	10.0.245.182/31	10.0.245.182 – 10.0.245.183	10.0.245.183
221	10.0.245.184/31	10.0.245.184 – 10.0.245.185	10.0.245.185
222	10.0.245.186/31	10.0.245.186 – 10.0.245.187	10.0.245.187
223	10.0.245.188/31	10.0.245.188 – 10.0.245.189	10.0.245.189
224	10.0.245.190/31	10.0.245.190 – 10.0.245.191	10.0.245.191
225	10.0.245.192/31	10.0.245.192 – 10.0.245.193	10.0.245.193
226	10.0.245.194/31	10.0.245.194 – 10.0.245.195	10.0.245.195
227	10.0.245.196/31	10.0.245.196 – 10.0.245.197	10.0.245.197
228	10.0.245.198/31	10.0.245.198 – 10.0.245.199	10.0.245.199
229	10.0.245.200/31	10.0.245.200 – 10.0.245.201	10.0.245.201
230	10.0.245.202/31	10.0.245.202 – 10.0.245.203	10.0.245.203
231	10.0.245.204/31	10.0.245.204 – 10.0.245.205	10.0.245.205
232	10.0.245.206/31	10.0.245.206 – 10.0.245.207	10.0.245.207
233	10.0.245.208/31	10.0.245.208 – 10.0.245.209	10.0.245.209
234	10.0.245.210/31	10.0.245.210 – 10.0.245.211	10.0.245.211
235	10.0.245.212/31	10.0.245.212 – 10.0.245.213	10.0.245.213
236	10.0.245.214/31	10.0.245.214 – 10.0.245.215	10.0.245.215
237	10.0.245.216/31	10.0.245.216 – 10.0.245.217	10.0.245.217
238	10.0.245.218/31	10.0.245.218 – 10.0.245.219	10.0.245.219
239	10.0.245.220/31	10.0.245.220 – 10.0.245.221	10.0.245.221
240	10.0.245.222/31	10.0.245.222 – 10.0.245.223	10.0.245.223
241	10.0.245.224/31	10.0.245.224 – 10.0.245.225	10.0.245.225
242	10.0.245.226/31	10.0.245.226 – 10.0.245.227	10.0.245.227
243	10.0.245.228/31	10.0.245.228 – 10.0.245.229	10.0.245.229
244	10.0.245.230/31	10.0.245.230 – 10.0.245.231	10.0.245.231
245	10.0.245.232/31	10.0.245.232 – 10.0.245.233	10.0.245.233
246	10.0.245.234/31	10.0.245.234 – 10.0.245.235	10.0.245.235
247	10.0.245.236/31	10.0.245.236 – 10.0.245.237	10.0.245.237
248	10.0.245.238/31	10.0.245.238 – 10.0.245.239	10.0.245.239
249	10.0.245.240/31	10.0.245.240 – 10.0.245.241	10.0.245.241
250	10.0.245.242/31	10.0.245.242 – 10.0.245.243	10.0.245.243
251	10.0.245.244/31	10.0.245.244 – 10.0.245.245	10.0.245.245
252	10.0.245.246/31	10.0.245.246 – 10.0.245.247	10.0.245.247
253	10.0.245.248/31	10.0.245.248 – 10.0.245.249	10.0.245.249
254	10.0.245.250/31	10.0.245.250 – 10.0.245.251	10.0.245.251
255	10.0.245.252/31	10.0.245.252 – 10.0.245.253	10.0.245.253
256	10.0.245.254/31	10.0.245.254 – 10.0.245.255	10.0.245.255

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 /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 →