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)10.78.220.0/22

network10.78.220.0/22

broadcast10.78.223.255

first host10.78.220.1

last host10.78.223.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.78.220.0/22

address00001010.01001110.11011100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.01001110.11011100.00000000

broadcast00001010.01001110.11011111.11111111

green = network part, grey = host part

hex0x0a4edc00

decimal172940288

reverse dns0.220.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:dc00

/22 split into /31 · 512 subnets

close ×

#	network	host range	broadcast
1	10.78.220.0/31	10.78.220.0 – 10.78.220.1	10.78.220.1
2	10.78.220.2/31	10.78.220.2 – 10.78.220.3	10.78.220.3
3	10.78.220.4/31	10.78.220.4 – 10.78.220.5	10.78.220.5
4	10.78.220.6/31	10.78.220.6 – 10.78.220.7	10.78.220.7
5	10.78.220.8/31	10.78.220.8 – 10.78.220.9	10.78.220.9
6	10.78.220.10/31	10.78.220.10 – 10.78.220.11	10.78.220.11
7	10.78.220.12/31	10.78.220.12 – 10.78.220.13	10.78.220.13
8	10.78.220.14/31	10.78.220.14 – 10.78.220.15	10.78.220.15
9	10.78.220.16/31	10.78.220.16 – 10.78.220.17	10.78.220.17
10	10.78.220.18/31	10.78.220.18 – 10.78.220.19	10.78.220.19
11	10.78.220.20/31	10.78.220.20 – 10.78.220.21	10.78.220.21
12	10.78.220.22/31	10.78.220.22 – 10.78.220.23	10.78.220.23
13	10.78.220.24/31	10.78.220.24 – 10.78.220.25	10.78.220.25
14	10.78.220.26/31	10.78.220.26 – 10.78.220.27	10.78.220.27
15	10.78.220.28/31	10.78.220.28 – 10.78.220.29	10.78.220.29
16	10.78.220.30/31	10.78.220.30 – 10.78.220.31	10.78.220.31
17	10.78.220.32/31	10.78.220.32 – 10.78.220.33	10.78.220.33
18	10.78.220.34/31	10.78.220.34 – 10.78.220.35	10.78.220.35
19	10.78.220.36/31	10.78.220.36 – 10.78.220.37	10.78.220.37
20	10.78.220.38/31	10.78.220.38 – 10.78.220.39	10.78.220.39
21	10.78.220.40/31	10.78.220.40 – 10.78.220.41	10.78.220.41
22	10.78.220.42/31	10.78.220.42 – 10.78.220.43	10.78.220.43
23	10.78.220.44/31	10.78.220.44 – 10.78.220.45	10.78.220.45
24	10.78.220.46/31	10.78.220.46 – 10.78.220.47	10.78.220.47
25	10.78.220.48/31	10.78.220.48 – 10.78.220.49	10.78.220.49
26	10.78.220.50/31	10.78.220.50 – 10.78.220.51	10.78.220.51
27	10.78.220.52/31	10.78.220.52 – 10.78.220.53	10.78.220.53
28	10.78.220.54/31	10.78.220.54 – 10.78.220.55	10.78.220.55
29	10.78.220.56/31	10.78.220.56 – 10.78.220.57	10.78.220.57
30	10.78.220.58/31	10.78.220.58 – 10.78.220.59	10.78.220.59
31	10.78.220.60/31	10.78.220.60 – 10.78.220.61	10.78.220.61
32	10.78.220.62/31	10.78.220.62 – 10.78.220.63	10.78.220.63
33	10.78.220.64/31	10.78.220.64 – 10.78.220.65	10.78.220.65
34	10.78.220.66/31	10.78.220.66 – 10.78.220.67	10.78.220.67
35	10.78.220.68/31	10.78.220.68 – 10.78.220.69	10.78.220.69
36	10.78.220.70/31	10.78.220.70 – 10.78.220.71	10.78.220.71
37	10.78.220.72/31	10.78.220.72 – 10.78.220.73	10.78.220.73
38	10.78.220.74/31	10.78.220.74 – 10.78.220.75	10.78.220.75
39	10.78.220.76/31	10.78.220.76 – 10.78.220.77	10.78.220.77
40	10.78.220.78/31	10.78.220.78 – 10.78.220.79	10.78.220.79
41	10.78.220.80/31	10.78.220.80 – 10.78.220.81	10.78.220.81
42	10.78.220.82/31	10.78.220.82 – 10.78.220.83	10.78.220.83
43	10.78.220.84/31	10.78.220.84 – 10.78.220.85	10.78.220.85
44	10.78.220.86/31	10.78.220.86 – 10.78.220.87	10.78.220.87
45	10.78.220.88/31	10.78.220.88 – 10.78.220.89	10.78.220.89
46	10.78.220.90/31	10.78.220.90 – 10.78.220.91	10.78.220.91
47	10.78.220.92/31	10.78.220.92 – 10.78.220.93	10.78.220.93
48	10.78.220.94/31	10.78.220.94 – 10.78.220.95	10.78.220.95
49	10.78.220.96/31	10.78.220.96 – 10.78.220.97	10.78.220.97
50	10.78.220.98/31	10.78.220.98 – 10.78.220.99	10.78.220.99
51	10.78.220.100/31	10.78.220.100 – 10.78.220.101	10.78.220.101
52	10.78.220.102/31	10.78.220.102 – 10.78.220.103	10.78.220.103
53	10.78.220.104/31	10.78.220.104 – 10.78.220.105	10.78.220.105
54	10.78.220.106/31	10.78.220.106 – 10.78.220.107	10.78.220.107
55	10.78.220.108/31	10.78.220.108 – 10.78.220.109	10.78.220.109
56	10.78.220.110/31	10.78.220.110 – 10.78.220.111	10.78.220.111
57	10.78.220.112/31	10.78.220.112 – 10.78.220.113	10.78.220.113
58	10.78.220.114/31	10.78.220.114 – 10.78.220.115	10.78.220.115
59	10.78.220.116/31	10.78.220.116 – 10.78.220.117	10.78.220.117
60	10.78.220.118/31	10.78.220.118 – 10.78.220.119	10.78.220.119
61	10.78.220.120/31	10.78.220.120 – 10.78.220.121	10.78.220.121
62	10.78.220.122/31	10.78.220.122 – 10.78.220.123	10.78.220.123
63	10.78.220.124/31	10.78.220.124 – 10.78.220.125	10.78.220.125
64	10.78.220.126/31	10.78.220.126 – 10.78.220.127	10.78.220.127
65	10.78.220.128/31	10.78.220.128 – 10.78.220.129	10.78.220.129
66	10.78.220.130/31	10.78.220.130 – 10.78.220.131	10.78.220.131
67	10.78.220.132/31	10.78.220.132 – 10.78.220.133	10.78.220.133
68	10.78.220.134/31	10.78.220.134 – 10.78.220.135	10.78.220.135
69	10.78.220.136/31	10.78.220.136 – 10.78.220.137	10.78.220.137
70	10.78.220.138/31	10.78.220.138 – 10.78.220.139	10.78.220.139
71	10.78.220.140/31	10.78.220.140 – 10.78.220.141	10.78.220.141
72	10.78.220.142/31	10.78.220.142 – 10.78.220.143	10.78.220.143
73	10.78.220.144/31	10.78.220.144 – 10.78.220.145	10.78.220.145
74	10.78.220.146/31	10.78.220.146 – 10.78.220.147	10.78.220.147
75	10.78.220.148/31	10.78.220.148 – 10.78.220.149	10.78.220.149
76	10.78.220.150/31	10.78.220.150 – 10.78.220.151	10.78.220.151
77	10.78.220.152/31	10.78.220.152 – 10.78.220.153	10.78.220.153
78	10.78.220.154/31	10.78.220.154 – 10.78.220.155	10.78.220.155
79	10.78.220.156/31	10.78.220.156 – 10.78.220.157	10.78.220.157
80	10.78.220.158/31	10.78.220.158 – 10.78.220.159	10.78.220.159
81	10.78.220.160/31	10.78.220.160 – 10.78.220.161	10.78.220.161
82	10.78.220.162/31	10.78.220.162 – 10.78.220.163	10.78.220.163
83	10.78.220.164/31	10.78.220.164 – 10.78.220.165	10.78.220.165
84	10.78.220.166/31	10.78.220.166 – 10.78.220.167	10.78.220.167
85	10.78.220.168/31	10.78.220.168 – 10.78.220.169	10.78.220.169
86	10.78.220.170/31	10.78.220.170 – 10.78.220.171	10.78.220.171
87	10.78.220.172/31	10.78.220.172 – 10.78.220.173	10.78.220.173
88	10.78.220.174/31	10.78.220.174 – 10.78.220.175	10.78.220.175
89	10.78.220.176/31	10.78.220.176 – 10.78.220.177	10.78.220.177
90	10.78.220.178/31	10.78.220.178 – 10.78.220.179	10.78.220.179
91	10.78.220.180/31	10.78.220.180 – 10.78.220.181	10.78.220.181
92	10.78.220.182/31	10.78.220.182 – 10.78.220.183	10.78.220.183
93	10.78.220.184/31	10.78.220.184 – 10.78.220.185	10.78.220.185
94	10.78.220.186/31	10.78.220.186 – 10.78.220.187	10.78.220.187
95	10.78.220.188/31	10.78.220.188 – 10.78.220.189	10.78.220.189
96	10.78.220.190/31	10.78.220.190 – 10.78.220.191	10.78.220.191
97	10.78.220.192/31	10.78.220.192 – 10.78.220.193	10.78.220.193
98	10.78.220.194/31	10.78.220.194 – 10.78.220.195	10.78.220.195
99	10.78.220.196/31	10.78.220.196 – 10.78.220.197	10.78.220.197
100	10.78.220.198/31	10.78.220.198 – 10.78.220.199	10.78.220.199
101	10.78.220.200/31	10.78.220.200 – 10.78.220.201	10.78.220.201
102	10.78.220.202/31	10.78.220.202 – 10.78.220.203	10.78.220.203
103	10.78.220.204/31	10.78.220.204 – 10.78.220.205	10.78.220.205
104	10.78.220.206/31	10.78.220.206 – 10.78.220.207	10.78.220.207
105	10.78.220.208/31	10.78.220.208 – 10.78.220.209	10.78.220.209
106	10.78.220.210/31	10.78.220.210 – 10.78.220.211	10.78.220.211
107	10.78.220.212/31	10.78.220.212 – 10.78.220.213	10.78.220.213
108	10.78.220.214/31	10.78.220.214 – 10.78.220.215	10.78.220.215
109	10.78.220.216/31	10.78.220.216 – 10.78.220.217	10.78.220.217
110	10.78.220.218/31	10.78.220.218 – 10.78.220.219	10.78.220.219
111	10.78.220.220/31	10.78.220.220 – 10.78.220.221	10.78.220.221
112	10.78.220.222/31	10.78.220.222 – 10.78.220.223	10.78.220.223
113	10.78.220.224/31	10.78.220.224 – 10.78.220.225	10.78.220.225
114	10.78.220.226/31	10.78.220.226 – 10.78.220.227	10.78.220.227
115	10.78.220.228/31	10.78.220.228 – 10.78.220.229	10.78.220.229
116	10.78.220.230/31	10.78.220.230 – 10.78.220.231	10.78.220.231
117	10.78.220.232/31	10.78.220.232 – 10.78.220.233	10.78.220.233
118	10.78.220.234/31	10.78.220.234 – 10.78.220.235	10.78.220.235
119	10.78.220.236/31	10.78.220.236 – 10.78.220.237	10.78.220.237
120	10.78.220.238/31	10.78.220.238 – 10.78.220.239	10.78.220.239
121	10.78.220.240/31	10.78.220.240 – 10.78.220.241	10.78.220.241
122	10.78.220.242/31	10.78.220.242 – 10.78.220.243	10.78.220.243
123	10.78.220.244/31	10.78.220.244 – 10.78.220.245	10.78.220.245
124	10.78.220.246/31	10.78.220.246 – 10.78.220.247	10.78.220.247
125	10.78.220.248/31	10.78.220.248 – 10.78.220.249	10.78.220.249
126	10.78.220.250/31	10.78.220.250 – 10.78.220.251	10.78.220.251
127	10.78.220.252/31	10.78.220.252 – 10.78.220.253	10.78.220.253
128	10.78.220.254/31	10.78.220.254 – 10.78.220.255	10.78.220.255
129	10.78.221.0/31	10.78.221.0 – 10.78.221.1	10.78.221.1
130	10.78.221.2/31	10.78.221.2 – 10.78.221.3	10.78.221.3
131	10.78.221.4/31	10.78.221.4 – 10.78.221.5	10.78.221.5
132	10.78.221.6/31	10.78.221.6 – 10.78.221.7	10.78.221.7
133	10.78.221.8/31	10.78.221.8 – 10.78.221.9	10.78.221.9
134	10.78.221.10/31	10.78.221.10 – 10.78.221.11	10.78.221.11
135	10.78.221.12/31	10.78.221.12 – 10.78.221.13	10.78.221.13
136	10.78.221.14/31	10.78.221.14 – 10.78.221.15	10.78.221.15
137	10.78.221.16/31	10.78.221.16 – 10.78.221.17	10.78.221.17
138	10.78.221.18/31	10.78.221.18 – 10.78.221.19	10.78.221.19
139	10.78.221.20/31	10.78.221.20 – 10.78.221.21	10.78.221.21
140	10.78.221.22/31	10.78.221.22 – 10.78.221.23	10.78.221.23
141	10.78.221.24/31	10.78.221.24 – 10.78.221.25	10.78.221.25
142	10.78.221.26/31	10.78.221.26 – 10.78.221.27	10.78.221.27
143	10.78.221.28/31	10.78.221.28 – 10.78.221.29	10.78.221.29
144	10.78.221.30/31	10.78.221.30 – 10.78.221.31	10.78.221.31
145	10.78.221.32/31	10.78.221.32 – 10.78.221.33	10.78.221.33
146	10.78.221.34/31	10.78.221.34 – 10.78.221.35	10.78.221.35
147	10.78.221.36/31	10.78.221.36 – 10.78.221.37	10.78.221.37
148	10.78.221.38/31	10.78.221.38 – 10.78.221.39	10.78.221.39
149	10.78.221.40/31	10.78.221.40 – 10.78.221.41	10.78.221.41
150	10.78.221.42/31	10.78.221.42 – 10.78.221.43	10.78.221.43
151	10.78.221.44/31	10.78.221.44 – 10.78.221.45	10.78.221.45
152	10.78.221.46/31	10.78.221.46 – 10.78.221.47	10.78.221.47
153	10.78.221.48/31	10.78.221.48 – 10.78.221.49	10.78.221.49
154	10.78.221.50/31	10.78.221.50 – 10.78.221.51	10.78.221.51
155	10.78.221.52/31	10.78.221.52 – 10.78.221.53	10.78.221.53
156	10.78.221.54/31	10.78.221.54 – 10.78.221.55	10.78.221.55
157	10.78.221.56/31	10.78.221.56 – 10.78.221.57	10.78.221.57
158	10.78.221.58/31	10.78.221.58 – 10.78.221.59	10.78.221.59
159	10.78.221.60/31	10.78.221.60 – 10.78.221.61	10.78.221.61
160	10.78.221.62/31	10.78.221.62 – 10.78.221.63	10.78.221.63
161	10.78.221.64/31	10.78.221.64 – 10.78.221.65	10.78.221.65
162	10.78.221.66/31	10.78.221.66 – 10.78.221.67	10.78.221.67
163	10.78.221.68/31	10.78.221.68 – 10.78.221.69	10.78.221.69
164	10.78.221.70/31	10.78.221.70 – 10.78.221.71	10.78.221.71
165	10.78.221.72/31	10.78.221.72 – 10.78.221.73	10.78.221.73
166	10.78.221.74/31	10.78.221.74 – 10.78.221.75	10.78.221.75
167	10.78.221.76/31	10.78.221.76 – 10.78.221.77	10.78.221.77
168	10.78.221.78/31	10.78.221.78 – 10.78.221.79	10.78.221.79
169	10.78.221.80/31	10.78.221.80 – 10.78.221.81	10.78.221.81
170	10.78.221.82/31	10.78.221.82 – 10.78.221.83	10.78.221.83
171	10.78.221.84/31	10.78.221.84 – 10.78.221.85	10.78.221.85
172	10.78.221.86/31	10.78.221.86 – 10.78.221.87	10.78.221.87
173	10.78.221.88/31	10.78.221.88 – 10.78.221.89	10.78.221.89
174	10.78.221.90/31	10.78.221.90 – 10.78.221.91	10.78.221.91
175	10.78.221.92/31	10.78.221.92 – 10.78.221.93	10.78.221.93
176	10.78.221.94/31	10.78.221.94 – 10.78.221.95	10.78.221.95
177	10.78.221.96/31	10.78.221.96 – 10.78.221.97	10.78.221.97
178	10.78.221.98/31	10.78.221.98 – 10.78.221.99	10.78.221.99
179	10.78.221.100/31	10.78.221.100 – 10.78.221.101	10.78.221.101
180	10.78.221.102/31	10.78.221.102 – 10.78.221.103	10.78.221.103
181	10.78.221.104/31	10.78.221.104 – 10.78.221.105	10.78.221.105
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187	10.78.221.116/31	10.78.221.116 – 10.78.221.117	10.78.221.117
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190	10.78.221.122/31	10.78.221.122 – 10.78.221.123	10.78.221.123
191	10.78.221.124/31	10.78.221.124 – 10.78.221.125	10.78.221.125
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193	10.78.221.128/31	10.78.221.128 – 10.78.221.129	10.78.221.129
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196	10.78.221.134/31	10.78.221.134 – 10.78.221.135	10.78.221.135
197	10.78.221.136/31	10.78.221.136 – 10.78.221.137	10.78.221.137
198	10.78.221.138/31	10.78.221.138 – 10.78.221.139	10.78.221.139
199	10.78.221.140/31	10.78.221.140 – 10.78.221.141	10.78.221.141
200	10.78.221.142/31	10.78.221.142 – 10.78.221.143	10.78.221.143
201	10.78.221.144/31	10.78.221.144 – 10.78.221.145	10.78.221.145
202	10.78.221.146/31	10.78.221.146 – 10.78.221.147	10.78.221.147
203	10.78.221.148/31	10.78.221.148 – 10.78.221.149	10.78.221.149
204	10.78.221.150/31	10.78.221.150 – 10.78.221.151	10.78.221.151
205	10.78.221.152/31	10.78.221.152 – 10.78.221.153	10.78.221.153
206	10.78.221.154/31	10.78.221.154 – 10.78.221.155	10.78.221.155
207	10.78.221.156/31	10.78.221.156 – 10.78.221.157	10.78.221.157
208	10.78.221.158/31	10.78.221.158 – 10.78.221.159	10.78.221.159
209	10.78.221.160/31	10.78.221.160 – 10.78.221.161	10.78.221.161
210	10.78.221.162/31	10.78.221.162 – 10.78.221.163	10.78.221.163
211	10.78.221.164/31	10.78.221.164 – 10.78.221.165	10.78.221.165
212	10.78.221.166/31	10.78.221.166 – 10.78.221.167	10.78.221.167
213	10.78.221.168/31	10.78.221.168 – 10.78.221.169	10.78.221.169
214	10.78.221.170/31	10.78.221.170 – 10.78.221.171	10.78.221.171
215	10.78.221.172/31	10.78.221.172 – 10.78.221.173	10.78.221.173
216	10.78.221.174/31	10.78.221.174 – 10.78.221.175	10.78.221.175
217	10.78.221.176/31	10.78.221.176 – 10.78.221.177	10.78.221.177
218	10.78.221.178/31	10.78.221.178 – 10.78.221.179	10.78.221.179
219	10.78.221.180/31	10.78.221.180 – 10.78.221.181	10.78.221.181
220	10.78.221.182/31	10.78.221.182 – 10.78.221.183	10.78.221.183
221	10.78.221.184/31	10.78.221.184 – 10.78.221.185	10.78.221.185
222	10.78.221.186/31	10.78.221.186 – 10.78.221.187	10.78.221.187
223	10.78.221.188/31	10.78.221.188 – 10.78.221.189	10.78.221.189
224	10.78.221.190/31	10.78.221.190 – 10.78.221.191	10.78.221.191
225	10.78.221.192/31	10.78.221.192 – 10.78.221.193	10.78.221.193
226	10.78.221.194/31	10.78.221.194 – 10.78.221.195	10.78.221.195
227	10.78.221.196/31	10.78.221.196 – 10.78.221.197	10.78.221.197
228	10.78.221.198/31	10.78.221.198 – 10.78.221.199	10.78.221.199
229	10.78.221.200/31	10.78.221.200 – 10.78.221.201	10.78.221.201
230	10.78.221.202/31	10.78.221.202 – 10.78.221.203	10.78.221.203
231	10.78.221.204/31	10.78.221.204 – 10.78.221.205	10.78.221.205
232	10.78.221.206/31	10.78.221.206 – 10.78.221.207	10.78.221.207
233	10.78.221.208/31	10.78.221.208 – 10.78.221.209	10.78.221.209
234	10.78.221.210/31	10.78.221.210 – 10.78.221.211	10.78.221.211
235	10.78.221.212/31	10.78.221.212 – 10.78.221.213	10.78.221.213
236	10.78.221.214/31	10.78.221.214 – 10.78.221.215	10.78.221.215
237	10.78.221.216/31	10.78.221.216 – 10.78.221.217	10.78.221.217
238	10.78.221.218/31	10.78.221.218 – 10.78.221.219	10.78.221.219
239	10.78.221.220/31	10.78.221.220 – 10.78.221.221	10.78.221.221
240	10.78.221.222/31	10.78.221.222 – 10.78.221.223	10.78.221.223
241	10.78.221.224/31	10.78.221.224 – 10.78.221.225	10.78.221.225
242	10.78.221.226/31	10.78.221.226 – 10.78.221.227	10.78.221.227
243	10.78.221.228/31	10.78.221.228 – 10.78.221.229	10.78.221.229
244	10.78.221.230/31	10.78.221.230 – 10.78.221.231	10.78.221.231
245	10.78.221.232/31	10.78.221.232 – 10.78.221.233	10.78.221.233
246	10.78.221.234/31	10.78.221.234 – 10.78.221.235	10.78.221.235
247	10.78.221.236/31	10.78.221.236 – 10.78.221.237	10.78.221.237
248	10.78.221.238/31	10.78.221.238 – 10.78.221.239	10.78.221.239
249	10.78.221.240/31	10.78.221.240 – 10.78.221.241	10.78.221.241
250	10.78.221.242/31	10.78.221.242 – 10.78.221.243	10.78.221.243
251	10.78.221.244/31	10.78.221.244 – 10.78.221.245	10.78.221.245
252	10.78.221.246/31	10.78.221.246 – 10.78.221.247	10.78.221.247
253	10.78.221.248/31	10.78.221.248 – 10.78.221.249	10.78.221.249
254	10.78.221.250/31	10.78.221.250 – 10.78.221.251	10.78.221.251
255	10.78.221.252/31	10.78.221.252 – 10.78.221.253	10.78.221.253
256	10.78.221.254/31	10.78.221.254 – 10.78.221.255	10.78.221.255

showing 256 of 512

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 /22
/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	1
/23	255.255.254.0	512	510	2 split →
/24	255.255.255.0	256	254	4 split →
/25	255.255.255.128	128	126	8 split →
/26	255.255.255.192	64	62	16 split →
/27	255.255.255.224	32	30	32 split →
/28	255.255.255.240	16	14	64 split →
/29	255.255.255.248	8	6	128 split →
/30	255.255.255.252	4	2	256 split →
/31	255.255.255.254	2	2	512 split →
/32	255.255.255.255	1	1	1,024 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 →