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)10.4.56.0/21

network10.4.56.0/21

broadcast10.4.63.255

first host10.4.56.1

last host10.4.63.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.56.0/21

address00001010.00000100.00111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.00111000.00000000

broadcast00001010.00000100.00111111.11111111

green = network part, grey = host part

hex0x0a043800

decimal168048640

reverse dns0.56.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:3800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.4.56.0/31	10.4.56.0 – 10.4.56.1	10.4.56.1
2	10.4.56.2/31	10.4.56.2 – 10.4.56.3	10.4.56.3
3	10.4.56.4/31	10.4.56.4 – 10.4.56.5	10.4.56.5
4	10.4.56.6/31	10.4.56.6 – 10.4.56.7	10.4.56.7
5	10.4.56.8/31	10.4.56.8 – 10.4.56.9	10.4.56.9
6	10.4.56.10/31	10.4.56.10 – 10.4.56.11	10.4.56.11
7	10.4.56.12/31	10.4.56.12 – 10.4.56.13	10.4.56.13
8	10.4.56.14/31	10.4.56.14 – 10.4.56.15	10.4.56.15
9	10.4.56.16/31	10.4.56.16 – 10.4.56.17	10.4.56.17
10	10.4.56.18/31	10.4.56.18 – 10.4.56.19	10.4.56.19
11	10.4.56.20/31	10.4.56.20 – 10.4.56.21	10.4.56.21
12	10.4.56.22/31	10.4.56.22 – 10.4.56.23	10.4.56.23
13	10.4.56.24/31	10.4.56.24 – 10.4.56.25	10.4.56.25
14	10.4.56.26/31	10.4.56.26 – 10.4.56.27	10.4.56.27
15	10.4.56.28/31	10.4.56.28 – 10.4.56.29	10.4.56.29
16	10.4.56.30/31	10.4.56.30 – 10.4.56.31	10.4.56.31
17	10.4.56.32/31	10.4.56.32 – 10.4.56.33	10.4.56.33
18	10.4.56.34/31	10.4.56.34 – 10.4.56.35	10.4.56.35
19	10.4.56.36/31	10.4.56.36 – 10.4.56.37	10.4.56.37
20	10.4.56.38/31	10.4.56.38 – 10.4.56.39	10.4.56.39
21	10.4.56.40/31	10.4.56.40 – 10.4.56.41	10.4.56.41
22	10.4.56.42/31	10.4.56.42 – 10.4.56.43	10.4.56.43
23	10.4.56.44/31	10.4.56.44 – 10.4.56.45	10.4.56.45
24	10.4.56.46/31	10.4.56.46 – 10.4.56.47	10.4.56.47
25	10.4.56.48/31	10.4.56.48 – 10.4.56.49	10.4.56.49
26	10.4.56.50/31	10.4.56.50 – 10.4.56.51	10.4.56.51
27	10.4.56.52/31	10.4.56.52 – 10.4.56.53	10.4.56.53
28	10.4.56.54/31	10.4.56.54 – 10.4.56.55	10.4.56.55
29	10.4.56.56/31	10.4.56.56 – 10.4.56.57	10.4.56.57
30	10.4.56.58/31	10.4.56.58 – 10.4.56.59	10.4.56.59
31	10.4.56.60/31	10.4.56.60 – 10.4.56.61	10.4.56.61
32	10.4.56.62/31	10.4.56.62 – 10.4.56.63	10.4.56.63
33	10.4.56.64/31	10.4.56.64 – 10.4.56.65	10.4.56.65
34	10.4.56.66/31	10.4.56.66 – 10.4.56.67	10.4.56.67
35	10.4.56.68/31	10.4.56.68 – 10.4.56.69	10.4.56.69
36	10.4.56.70/31	10.4.56.70 – 10.4.56.71	10.4.56.71
37	10.4.56.72/31	10.4.56.72 – 10.4.56.73	10.4.56.73
38	10.4.56.74/31	10.4.56.74 – 10.4.56.75	10.4.56.75
39	10.4.56.76/31	10.4.56.76 – 10.4.56.77	10.4.56.77
40	10.4.56.78/31	10.4.56.78 – 10.4.56.79	10.4.56.79
41	10.4.56.80/31	10.4.56.80 – 10.4.56.81	10.4.56.81
42	10.4.56.82/31	10.4.56.82 – 10.4.56.83	10.4.56.83
43	10.4.56.84/31	10.4.56.84 – 10.4.56.85	10.4.56.85
44	10.4.56.86/31	10.4.56.86 – 10.4.56.87	10.4.56.87
45	10.4.56.88/31	10.4.56.88 – 10.4.56.89	10.4.56.89
46	10.4.56.90/31	10.4.56.90 – 10.4.56.91	10.4.56.91
47	10.4.56.92/31	10.4.56.92 – 10.4.56.93	10.4.56.93
48	10.4.56.94/31	10.4.56.94 – 10.4.56.95	10.4.56.95
49	10.4.56.96/31	10.4.56.96 – 10.4.56.97	10.4.56.97
50	10.4.56.98/31	10.4.56.98 – 10.4.56.99	10.4.56.99
51	10.4.56.100/31	10.4.56.100 – 10.4.56.101	10.4.56.101
52	10.4.56.102/31	10.4.56.102 – 10.4.56.103	10.4.56.103
53	10.4.56.104/31	10.4.56.104 – 10.4.56.105	10.4.56.105
54	10.4.56.106/31	10.4.56.106 – 10.4.56.107	10.4.56.107
55	10.4.56.108/31	10.4.56.108 – 10.4.56.109	10.4.56.109
56	10.4.56.110/31	10.4.56.110 – 10.4.56.111	10.4.56.111
57	10.4.56.112/31	10.4.56.112 – 10.4.56.113	10.4.56.113
58	10.4.56.114/31	10.4.56.114 – 10.4.56.115	10.4.56.115
59	10.4.56.116/31	10.4.56.116 – 10.4.56.117	10.4.56.117
60	10.4.56.118/31	10.4.56.118 – 10.4.56.119	10.4.56.119
61	10.4.56.120/31	10.4.56.120 – 10.4.56.121	10.4.56.121
62	10.4.56.122/31	10.4.56.122 – 10.4.56.123	10.4.56.123
63	10.4.56.124/31	10.4.56.124 – 10.4.56.125	10.4.56.125
64	10.4.56.126/31	10.4.56.126 – 10.4.56.127	10.4.56.127
65	10.4.56.128/31	10.4.56.128 – 10.4.56.129	10.4.56.129
66	10.4.56.130/31	10.4.56.130 – 10.4.56.131	10.4.56.131
67	10.4.56.132/31	10.4.56.132 – 10.4.56.133	10.4.56.133
68	10.4.56.134/31	10.4.56.134 – 10.4.56.135	10.4.56.135
69	10.4.56.136/31	10.4.56.136 – 10.4.56.137	10.4.56.137
70	10.4.56.138/31	10.4.56.138 – 10.4.56.139	10.4.56.139
71	10.4.56.140/31	10.4.56.140 – 10.4.56.141	10.4.56.141
72	10.4.56.142/31	10.4.56.142 – 10.4.56.143	10.4.56.143
73	10.4.56.144/31	10.4.56.144 – 10.4.56.145	10.4.56.145
74	10.4.56.146/31	10.4.56.146 – 10.4.56.147	10.4.56.147
75	10.4.56.148/31	10.4.56.148 – 10.4.56.149	10.4.56.149
76	10.4.56.150/31	10.4.56.150 – 10.4.56.151	10.4.56.151
77	10.4.56.152/31	10.4.56.152 – 10.4.56.153	10.4.56.153
78	10.4.56.154/31	10.4.56.154 – 10.4.56.155	10.4.56.155
79	10.4.56.156/31	10.4.56.156 – 10.4.56.157	10.4.56.157
80	10.4.56.158/31	10.4.56.158 – 10.4.56.159	10.4.56.159
81	10.4.56.160/31	10.4.56.160 – 10.4.56.161	10.4.56.161
82	10.4.56.162/31	10.4.56.162 – 10.4.56.163	10.4.56.163
83	10.4.56.164/31	10.4.56.164 – 10.4.56.165	10.4.56.165
84	10.4.56.166/31	10.4.56.166 – 10.4.56.167	10.4.56.167
85	10.4.56.168/31	10.4.56.168 – 10.4.56.169	10.4.56.169
86	10.4.56.170/31	10.4.56.170 – 10.4.56.171	10.4.56.171
87	10.4.56.172/31	10.4.56.172 – 10.4.56.173	10.4.56.173
88	10.4.56.174/31	10.4.56.174 – 10.4.56.175	10.4.56.175
89	10.4.56.176/31	10.4.56.176 – 10.4.56.177	10.4.56.177
90	10.4.56.178/31	10.4.56.178 – 10.4.56.179	10.4.56.179
91	10.4.56.180/31	10.4.56.180 – 10.4.56.181	10.4.56.181
92	10.4.56.182/31	10.4.56.182 – 10.4.56.183	10.4.56.183
93	10.4.56.184/31	10.4.56.184 – 10.4.56.185	10.4.56.185
94	10.4.56.186/31	10.4.56.186 – 10.4.56.187	10.4.56.187
95	10.4.56.188/31	10.4.56.188 – 10.4.56.189	10.4.56.189
96	10.4.56.190/31	10.4.56.190 – 10.4.56.191	10.4.56.191
97	10.4.56.192/31	10.4.56.192 – 10.4.56.193	10.4.56.193
98	10.4.56.194/31	10.4.56.194 – 10.4.56.195	10.4.56.195
99	10.4.56.196/31	10.4.56.196 – 10.4.56.197	10.4.56.197
100	10.4.56.198/31	10.4.56.198 – 10.4.56.199	10.4.56.199
101	10.4.56.200/31	10.4.56.200 – 10.4.56.201	10.4.56.201
102	10.4.56.202/31	10.4.56.202 – 10.4.56.203	10.4.56.203
103	10.4.56.204/31	10.4.56.204 – 10.4.56.205	10.4.56.205
104	10.4.56.206/31	10.4.56.206 – 10.4.56.207	10.4.56.207
105	10.4.56.208/31	10.4.56.208 – 10.4.56.209	10.4.56.209
106	10.4.56.210/31	10.4.56.210 – 10.4.56.211	10.4.56.211
107	10.4.56.212/31	10.4.56.212 – 10.4.56.213	10.4.56.213
108	10.4.56.214/31	10.4.56.214 – 10.4.56.215	10.4.56.215
109	10.4.56.216/31	10.4.56.216 – 10.4.56.217	10.4.56.217
110	10.4.56.218/31	10.4.56.218 – 10.4.56.219	10.4.56.219
111	10.4.56.220/31	10.4.56.220 – 10.4.56.221	10.4.56.221
112	10.4.56.222/31	10.4.56.222 – 10.4.56.223	10.4.56.223
113	10.4.56.224/31	10.4.56.224 – 10.4.56.225	10.4.56.225
114	10.4.56.226/31	10.4.56.226 – 10.4.56.227	10.4.56.227
115	10.4.56.228/31	10.4.56.228 – 10.4.56.229	10.4.56.229
116	10.4.56.230/31	10.4.56.230 – 10.4.56.231	10.4.56.231
117	10.4.56.232/31	10.4.56.232 – 10.4.56.233	10.4.56.233
118	10.4.56.234/31	10.4.56.234 – 10.4.56.235	10.4.56.235
119	10.4.56.236/31	10.4.56.236 – 10.4.56.237	10.4.56.237
120	10.4.56.238/31	10.4.56.238 – 10.4.56.239	10.4.56.239
121	10.4.56.240/31	10.4.56.240 – 10.4.56.241	10.4.56.241
122	10.4.56.242/31	10.4.56.242 – 10.4.56.243	10.4.56.243
123	10.4.56.244/31	10.4.56.244 – 10.4.56.245	10.4.56.245
124	10.4.56.246/31	10.4.56.246 – 10.4.56.247	10.4.56.247
125	10.4.56.248/31	10.4.56.248 – 10.4.56.249	10.4.56.249
126	10.4.56.250/31	10.4.56.250 – 10.4.56.251	10.4.56.251
127	10.4.56.252/31	10.4.56.252 – 10.4.56.253	10.4.56.253
128	10.4.56.254/31	10.4.56.254 – 10.4.56.255	10.4.56.255
129	10.4.57.0/31	10.4.57.0 – 10.4.57.1	10.4.57.1
130	10.4.57.2/31	10.4.57.2 – 10.4.57.3	10.4.57.3
131	10.4.57.4/31	10.4.57.4 – 10.4.57.5	10.4.57.5
132	10.4.57.6/31	10.4.57.6 – 10.4.57.7	10.4.57.7
133	10.4.57.8/31	10.4.57.8 – 10.4.57.9	10.4.57.9
134	10.4.57.10/31	10.4.57.10 – 10.4.57.11	10.4.57.11
135	10.4.57.12/31	10.4.57.12 – 10.4.57.13	10.4.57.13
136	10.4.57.14/31	10.4.57.14 – 10.4.57.15	10.4.57.15
137	10.4.57.16/31	10.4.57.16 – 10.4.57.17	10.4.57.17
138	10.4.57.18/31	10.4.57.18 – 10.4.57.19	10.4.57.19
139	10.4.57.20/31	10.4.57.20 – 10.4.57.21	10.4.57.21
140	10.4.57.22/31	10.4.57.22 – 10.4.57.23	10.4.57.23
141	10.4.57.24/31	10.4.57.24 – 10.4.57.25	10.4.57.25
142	10.4.57.26/31	10.4.57.26 – 10.4.57.27	10.4.57.27
143	10.4.57.28/31	10.4.57.28 – 10.4.57.29	10.4.57.29
144	10.4.57.30/31	10.4.57.30 – 10.4.57.31	10.4.57.31
145	10.4.57.32/31	10.4.57.32 – 10.4.57.33	10.4.57.33
146	10.4.57.34/31	10.4.57.34 – 10.4.57.35	10.4.57.35
147	10.4.57.36/31	10.4.57.36 – 10.4.57.37	10.4.57.37
148	10.4.57.38/31	10.4.57.38 – 10.4.57.39	10.4.57.39
149	10.4.57.40/31	10.4.57.40 – 10.4.57.41	10.4.57.41
150	10.4.57.42/31	10.4.57.42 – 10.4.57.43	10.4.57.43
151	10.4.57.44/31	10.4.57.44 – 10.4.57.45	10.4.57.45
152	10.4.57.46/31	10.4.57.46 – 10.4.57.47	10.4.57.47
153	10.4.57.48/31	10.4.57.48 – 10.4.57.49	10.4.57.49
154	10.4.57.50/31	10.4.57.50 – 10.4.57.51	10.4.57.51
155	10.4.57.52/31	10.4.57.52 – 10.4.57.53	10.4.57.53
156	10.4.57.54/31	10.4.57.54 – 10.4.57.55	10.4.57.55
157	10.4.57.56/31	10.4.57.56 – 10.4.57.57	10.4.57.57
158	10.4.57.58/31	10.4.57.58 – 10.4.57.59	10.4.57.59
159	10.4.57.60/31	10.4.57.60 – 10.4.57.61	10.4.57.61
160	10.4.57.62/31	10.4.57.62 – 10.4.57.63	10.4.57.63
161	10.4.57.64/31	10.4.57.64 – 10.4.57.65	10.4.57.65
162	10.4.57.66/31	10.4.57.66 – 10.4.57.67	10.4.57.67
163	10.4.57.68/31	10.4.57.68 – 10.4.57.69	10.4.57.69
164	10.4.57.70/31	10.4.57.70 – 10.4.57.71	10.4.57.71
165	10.4.57.72/31	10.4.57.72 – 10.4.57.73	10.4.57.73
166	10.4.57.74/31	10.4.57.74 – 10.4.57.75	10.4.57.75
167	10.4.57.76/31	10.4.57.76 – 10.4.57.77	10.4.57.77
168	10.4.57.78/31	10.4.57.78 – 10.4.57.79	10.4.57.79
169	10.4.57.80/31	10.4.57.80 – 10.4.57.81	10.4.57.81
170	10.4.57.82/31	10.4.57.82 – 10.4.57.83	10.4.57.83
171	10.4.57.84/31	10.4.57.84 – 10.4.57.85	10.4.57.85
172	10.4.57.86/31	10.4.57.86 – 10.4.57.87	10.4.57.87
173	10.4.57.88/31	10.4.57.88 – 10.4.57.89	10.4.57.89
174	10.4.57.90/31	10.4.57.90 – 10.4.57.91	10.4.57.91
175	10.4.57.92/31	10.4.57.92 – 10.4.57.93	10.4.57.93
176	10.4.57.94/31	10.4.57.94 – 10.4.57.95	10.4.57.95
177	10.4.57.96/31	10.4.57.96 – 10.4.57.97	10.4.57.97
178	10.4.57.98/31	10.4.57.98 – 10.4.57.99	10.4.57.99
179	10.4.57.100/31	10.4.57.100 – 10.4.57.101	10.4.57.101
180	10.4.57.102/31	10.4.57.102 – 10.4.57.103	10.4.57.103
181	10.4.57.104/31	10.4.57.104 – 10.4.57.105	10.4.57.105
182	10.4.57.106/31	10.4.57.106 – 10.4.57.107	10.4.57.107
183	10.4.57.108/31	10.4.57.108 – 10.4.57.109	10.4.57.109
184	10.4.57.110/31	10.4.57.110 – 10.4.57.111	10.4.57.111
185	10.4.57.112/31	10.4.57.112 – 10.4.57.113	10.4.57.113
186	10.4.57.114/31	10.4.57.114 – 10.4.57.115	10.4.57.115
187	10.4.57.116/31	10.4.57.116 – 10.4.57.117	10.4.57.117
188	10.4.57.118/31	10.4.57.118 – 10.4.57.119	10.4.57.119
189	10.4.57.120/31	10.4.57.120 – 10.4.57.121	10.4.57.121
190	10.4.57.122/31	10.4.57.122 – 10.4.57.123	10.4.57.123
191	10.4.57.124/31	10.4.57.124 – 10.4.57.125	10.4.57.125
192	10.4.57.126/31	10.4.57.126 – 10.4.57.127	10.4.57.127
193	10.4.57.128/31	10.4.57.128 – 10.4.57.129	10.4.57.129
194	10.4.57.130/31	10.4.57.130 – 10.4.57.131	10.4.57.131
195	10.4.57.132/31	10.4.57.132 – 10.4.57.133	10.4.57.133
196	10.4.57.134/31	10.4.57.134 – 10.4.57.135	10.4.57.135
197	10.4.57.136/31	10.4.57.136 – 10.4.57.137	10.4.57.137
198	10.4.57.138/31	10.4.57.138 – 10.4.57.139	10.4.57.139
199	10.4.57.140/31	10.4.57.140 – 10.4.57.141	10.4.57.141
200	10.4.57.142/31	10.4.57.142 – 10.4.57.143	10.4.57.143
201	10.4.57.144/31	10.4.57.144 – 10.4.57.145	10.4.57.145
202	10.4.57.146/31	10.4.57.146 – 10.4.57.147	10.4.57.147
203	10.4.57.148/31	10.4.57.148 – 10.4.57.149	10.4.57.149
204	10.4.57.150/31	10.4.57.150 – 10.4.57.151	10.4.57.151
205	10.4.57.152/31	10.4.57.152 – 10.4.57.153	10.4.57.153
206	10.4.57.154/31	10.4.57.154 – 10.4.57.155	10.4.57.155
207	10.4.57.156/31	10.4.57.156 – 10.4.57.157	10.4.57.157
208	10.4.57.158/31	10.4.57.158 – 10.4.57.159	10.4.57.159
209	10.4.57.160/31	10.4.57.160 – 10.4.57.161	10.4.57.161
210	10.4.57.162/31	10.4.57.162 – 10.4.57.163	10.4.57.163
211	10.4.57.164/31	10.4.57.164 – 10.4.57.165	10.4.57.165
212	10.4.57.166/31	10.4.57.166 – 10.4.57.167	10.4.57.167
213	10.4.57.168/31	10.4.57.168 – 10.4.57.169	10.4.57.169
214	10.4.57.170/31	10.4.57.170 – 10.4.57.171	10.4.57.171
215	10.4.57.172/31	10.4.57.172 – 10.4.57.173	10.4.57.173
216	10.4.57.174/31	10.4.57.174 – 10.4.57.175	10.4.57.175
217	10.4.57.176/31	10.4.57.176 – 10.4.57.177	10.4.57.177
218	10.4.57.178/31	10.4.57.178 – 10.4.57.179	10.4.57.179
219	10.4.57.180/31	10.4.57.180 – 10.4.57.181	10.4.57.181
220	10.4.57.182/31	10.4.57.182 – 10.4.57.183	10.4.57.183
221	10.4.57.184/31	10.4.57.184 – 10.4.57.185	10.4.57.185
222	10.4.57.186/31	10.4.57.186 – 10.4.57.187	10.4.57.187
223	10.4.57.188/31	10.4.57.188 – 10.4.57.189	10.4.57.189
224	10.4.57.190/31	10.4.57.190 – 10.4.57.191	10.4.57.191
225	10.4.57.192/31	10.4.57.192 – 10.4.57.193	10.4.57.193
226	10.4.57.194/31	10.4.57.194 – 10.4.57.195	10.4.57.195
227	10.4.57.196/31	10.4.57.196 – 10.4.57.197	10.4.57.197
228	10.4.57.198/31	10.4.57.198 – 10.4.57.199	10.4.57.199
229	10.4.57.200/31	10.4.57.200 – 10.4.57.201	10.4.57.201
230	10.4.57.202/31	10.4.57.202 – 10.4.57.203	10.4.57.203
231	10.4.57.204/31	10.4.57.204 – 10.4.57.205	10.4.57.205
232	10.4.57.206/31	10.4.57.206 – 10.4.57.207	10.4.57.207
233	10.4.57.208/31	10.4.57.208 – 10.4.57.209	10.4.57.209
234	10.4.57.210/31	10.4.57.210 – 10.4.57.211	10.4.57.211
235	10.4.57.212/31	10.4.57.212 – 10.4.57.213	10.4.57.213
236	10.4.57.214/31	10.4.57.214 – 10.4.57.215	10.4.57.215
237	10.4.57.216/31	10.4.57.216 – 10.4.57.217	10.4.57.217
238	10.4.57.218/31	10.4.57.218 – 10.4.57.219	10.4.57.219
239	10.4.57.220/31	10.4.57.220 – 10.4.57.221	10.4.57.221
240	10.4.57.222/31	10.4.57.222 – 10.4.57.223	10.4.57.223
241	10.4.57.224/31	10.4.57.224 – 10.4.57.225	10.4.57.225
242	10.4.57.226/31	10.4.57.226 – 10.4.57.227	10.4.57.227
243	10.4.57.228/31	10.4.57.228 – 10.4.57.229	10.4.57.229
244	10.4.57.230/31	10.4.57.230 – 10.4.57.231	10.4.57.231
245	10.4.57.232/31	10.4.57.232 – 10.4.57.233	10.4.57.233
246	10.4.57.234/31	10.4.57.234 – 10.4.57.235	10.4.57.235
247	10.4.57.236/31	10.4.57.236 – 10.4.57.237	10.4.57.237
248	10.4.57.238/31	10.4.57.238 – 10.4.57.239	10.4.57.239
249	10.4.57.240/31	10.4.57.240 – 10.4.57.241	10.4.57.241
250	10.4.57.242/31	10.4.57.242 – 10.4.57.243	10.4.57.243
251	10.4.57.244/31	10.4.57.244 – 10.4.57.245	10.4.57.245
252	10.4.57.246/31	10.4.57.246 – 10.4.57.247	10.4.57.247
253	10.4.57.248/31	10.4.57.248 – 10.4.57.249	10.4.57.249
254	10.4.57.250/31	10.4.57.250 – 10.4.57.251	10.4.57.251
255	10.4.57.252/31	10.4.57.252 – 10.4.57.253	10.4.57.253
256	10.4.57.254/31	10.4.57.254 – 10.4.57.255	10.4.57.255

showing 256 of 1,024

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 /21
/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	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →