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)10.4.0.0/21

network10.4.0.0/21

broadcast10.4.7.255

first host10.4.0.1

last host10.4.7.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.0.0/21

address00001010.00000100.00000000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.00000000.00000000

broadcast00001010.00000100.00000111.11111111

green = network part, grey = host part

hex0x0a040000

decimal168034304

reverse dns0.0.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:0

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.4.0.0/31	10.4.0.0 – 10.4.0.1	10.4.0.1
2	10.4.0.2/31	10.4.0.2 – 10.4.0.3	10.4.0.3
3	10.4.0.4/31	10.4.0.4 – 10.4.0.5	10.4.0.5
4	10.4.0.6/31	10.4.0.6 – 10.4.0.7	10.4.0.7
5	10.4.0.8/31	10.4.0.8 – 10.4.0.9	10.4.0.9
6	10.4.0.10/31	10.4.0.10 – 10.4.0.11	10.4.0.11
7	10.4.0.12/31	10.4.0.12 – 10.4.0.13	10.4.0.13
8	10.4.0.14/31	10.4.0.14 – 10.4.0.15	10.4.0.15
9	10.4.0.16/31	10.4.0.16 – 10.4.0.17	10.4.0.17
10	10.4.0.18/31	10.4.0.18 – 10.4.0.19	10.4.0.19
11	10.4.0.20/31	10.4.0.20 – 10.4.0.21	10.4.0.21
12	10.4.0.22/31	10.4.0.22 – 10.4.0.23	10.4.0.23
13	10.4.0.24/31	10.4.0.24 – 10.4.0.25	10.4.0.25
14	10.4.0.26/31	10.4.0.26 – 10.4.0.27	10.4.0.27
15	10.4.0.28/31	10.4.0.28 – 10.4.0.29	10.4.0.29
16	10.4.0.30/31	10.4.0.30 – 10.4.0.31	10.4.0.31
17	10.4.0.32/31	10.4.0.32 – 10.4.0.33	10.4.0.33
18	10.4.0.34/31	10.4.0.34 – 10.4.0.35	10.4.0.35
19	10.4.0.36/31	10.4.0.36 – 10.4.0.37	10.4.0.37
20	10.4.0.38/31	10.4.0.38 – 10.4.0.39	10.4.0.39
21	10.4.0.40/31	10.4.0.40 – 10.4.0.41	10.4.0.41
22	10.4.0.42/31	10.4.0.42 – 10.4.0.43	10.4.0.43
23	10.4.0.44/31	10.4.0.44 – 10.4.0.45	10.4.0.45
24	10.4.0.46/31	10.4.0.46 – 10.4.0.47	10.4.0.47
25	10.4.0.48/31	10.4.0.48 – 10.4.0.49	10.4.0.49
26	10.4.0.50/31	10.4.0.50 – 10.4.0.51	10.4.0.51
27	10.4.0.52/31	10.4.0.52 – 10.4.0.53	10.4.0.53
28	10.4.0.54/31	10.4.0.54 – 10.4.0.55	10.4.0.55
29	10.4.0.56/31	10.4.0.56 – 10.4.0.57	10.4.0.57
30	10.4.0.58/31	10.4.0.58 – 10.4.0.59	10.4.0.59
31	10.4.0.60/31	10.4.0.60 – 10.4.0.61	10.4.0.61
32	10.4.0.62/31	10.4.0.62 – 10.4.0.63	10.4.0.63
33	10.4.0.64/31	10.4.0.64 – 10.4.0.65	10.4.0.65
34	10.4.0.66/31	10.4.0.66 – 10.4.0.67	10.4.0.67
35	10.4.0.68/31	10.4.0.68 – 10.4.0.69	10.4.0.69
36	10.4.0.70/31	10.4.0.70 – 10.4.0.71	10.4.0.71
37	10.4.0.72/31	10.4.0.72 – 10.4.0.73	10.4.0.73
38	10.4.0.74/31	10.4.0.74 – 10.4.0.75	10.4.0.75
39	10.4.0.76/31	10.4.0.76 – 10.4.0.77	10.4.0.77
40	10.4.0.78/31	10.4.0.78 – 10.4.0.79	10.4.0.79
41	10.4.0.80/31	10.4.0.80 – 10.4.0.81	10.4.0.81
42	10.4.0.82/31	10.4.0.82 – 10.4.0.83	10.4.0.83
43	10.4.0.84/31	10.4.0.84 – 10.4.0.85	10.4.0.85
44	10.4.0.86/31	10.4.0.86 – 10.4.0.87	10.4.0.87
45	10.4.0.88/31	10.4.0.88 – 10.4.0.89	10.4.0.89
46	10.4.0.90/31	10.4.0.90 – 10.4.0.91	10.4.0.91
47	10.4.0.92/31	10.4.0.92 – 10.4.0.93	10.4.0.93
48	10.4.0.94/31	10.4.0.94 – 10.4.0.95	10.4.0.95
49	10.4.0.96/31	10.4.0.96 – 10.4.0.97	10.4.0.97
50	10.4.0.98/31	10.4.0.98 – 10.4.0.99	10.4.0.99
51	10.4.0.100/31	10.4.0.100 – 10.4.0.101	10.4.0.101
52	10.4.0.102/31	10.4.0.102 – 10.4.0.103	10.4.0.103
53	10.4.0.104/31	10.4.0.104 – 10.4.0.105	10.4.0.105
54	10.4.0.106/31	10.4.0.106 – 10.4.0.107	10.4.0.107
55	10.4.0.108/31	10.4.0.108 – 10.4.0.109	10.4.0.109
56	10.4.0.110/31	10.4.0.110 – 10.4.0.111	10.4.0.111
57	10.4.0.112/31	10.4.0.112 – 10.4.0.113	10.4.0.113
58	10.4.0.114/31	10.4.0.114 – 10.4.0.115	10.4.0.115
59	10.4.0.116/31	10.4.0.116 – 10.4.0.117	10.4.0.117
60	10.4.0.118/31	10.4.0.118 – 10.4.0.119	10.4.0.119
61	10.4.0.120/31	10.4.0.120 – 10.4.0.121	10.4.0.121
62	10.4.0.122/31	10.4.0.122 – 10.4.0.123	10.4.0.123
63	10.4.0.124/31	10.4.0.124 – 10.4.0.125	10.4.0.125
64	10.4.0.126/31	10.4.0.126 – 10.4.0.127	10.4.0.127
65	10.4.0.128/31	10.4.0.128 – 10.4.0.129	10.4.0.129
66	10.4.0.130/31	10.4.0.130 – 10.4.0.131	10.4.0.131
67	10.4.0.132/31	10.4.0.132 – 10.4.0.133	10.4.0.133
68	10.4.0.134/31	10.4.0.134 – 10.4.0.135	10.4.0.135
69	10.4.0.136/31	10.4.0.136 – 10.4.0.137	10.4.0.137
70	10.4.0.138/31	10.4.0.138 – 10.4.0.139	10.4.0.139
71	10.4.0.140/31	10.4.0.140 – 10.4.0.141	10.4.0.141
72	10.4.0.142/31	10.4.0.142 – 10.4.0.143	10.4.0.143
73	10.4.0.144/31	10.4.0.144 – 10.4.0.145	10.4.0.145
74	10.4.0.146/31	10.4.0.146 – 10.4.0.147	10.4.0.147
75	10.4.0.148/31	10.4.0.148 – 10.4.0.149	10.4.0.149
76	10.4.0.150/31	10.4.0.150 – 10.4.0.151	10.4.0.151
77	10.4.0.152/31	10.4.0.152 – 10.4.0.153	10.4.0.153
78	10.4.0.154/31	10.4.0.154 – 10.4.0.155	10.4.0.155
79	10.4.0.156/31	10.4.0.156 – 10.4.0.157	10.4.0.157
80	10.4.0.158/31	10.4.0.158 – 10.4.0.159	10.4.0.159
81	10.4.0.160/31	10.4.0.160 – 10.4.0.161	10.4.0.161
82	10.4.0.162/31	10.4.0.162 – 10.4.0.163	10.4.0.163
83	10.4.0.164/31	10.4.0.164 – 10.4.0.165	10.4.0.165
84	10.4.0.166/31	10.4.0.166 – 10.4.0.167	10.4.0.167
85	10.4.0.168/31	10.4.0.168 – 10.4.0.169	10.4.0.169
86	10.4.0.170/31	10.4.0.170 – 10.4.0.171	10.4.0.171
87	10.4.0.172/31	10.4.0.172 – 10.4.0.173	10.4.0.173
88	10.4.0.174/31	10.4.0.174 – 10.4.0.175	10.4.0.175
89	10.4.0.176/31	10.4.0.176 – 10.4.0.177	10.4.0.177
90	10.4.0.178/31	10.4.0.178 – 10.4.0.179	10.4.0.179
91	10.4.0.180/31	10.4.0.180 – 10.4.0.181	10.4.0.181
92	10.4.0.182/31	10.4.0.182 – 10.4.0.183	10.4.0.183
93	10.4.0.184/31	10.4.0.184 – 10.4.0.185	10.4.0.185
94	10.4.0.186/31	10.4.0.186 – 10.4.0.187	10.4.0.187
95	10.4.0.188/31	10.4.0.188 – 10.4.0.189	10.4.0.189
96	10.4.0.190/31	10.4.0.190 – 10.4.0.191	10.4.0.191
97	10.4.0.192/31	10.4.0.192 – 10.4.0.193	10.4.0.193
98	10.4.0.194/31	10.4.0.194 – 10.4.0.195	10.4.0.195
99	10.4.0.196/31	10.4.0.196 – 10.4.0.197	10.4.0.197
100	10.4.0.198/31	10.4.0.198 – 10.4.0.199	10.4.0.199
101	10.4.0.200/31	10.4.0.200 – 10.4.0.201	10.4.0.201
102	10.4.0.202/31	10.4.0.202 – 10.4.0.203	10.4.0.203
103	10.4.0.204/31	10.4.0.204 – 10.4.0.205	10.4.0.205
104	10.4.0.206/31	10.4.0.206 – 10.4.0.207	10.4.0.207
105	10.4.0.208/31	10.4.0.208 – 10.4.0.209	10.4.0.209
106	10.4.0.210/31	10.4.0.210 – 10.4.0.211	10.4.0.211
107	10.4.0.212/31	10.4.0.212 – 10.4.0.213	10.4.0.213
108	10.4.0.214/31	10.4.0.214 – 10.4.0.215	10.4.0.215
109	10.4.0.216/31	10.4.0.216 – 10.4.0.217	10.4.0.217
110	10.4.0.218/31	10.4.0.218 – 10.4.0.219	10.4.0.219
111	10.4.0.220/31	10.4.0.220 – 10.4.0.221	10.4.0.221
112	10.4.0.222/31	10.4.0.222 – 10.4.0.223	10.4.0.223
113	10.4.0.224/31	10.4.0.224 – 10.4.0.225	10.4.0.225
114	10.4.0.226/31	10.4.0.226 – 10.4.0.227	10.4.0.227
115	10.4.0.228/31	10.4.0.228 – 10.4.0.229	10.4.0.229
116	10.4.0.230/31	10.4.0.230 – 10.4.0.231	10.4.0.231
117	10.4.0.232/31	10.4.0.232 – 10.4.0.233	10.4.0.233
118	10.4.0.234/31	10.4.0.234 – 10.4.0.235	10.4.0.235
119	10.4.0.236/31	10.4.0.236 – 10.4.0.237	10.4.0.237
120	10.4.0.238/31	10.4.0.238 – 10.4.0.239	10.4.0.239
121	10.4.0.240/31	10.4.0.240 – 10.4.0.241	10.4.0.241
122	10.4.0.242/31	10.4.0.242 – 10.4.0.243	10.4.0.243
123	10.4.0.244/31	10.4.0.244 – 10.4.0.245	10.4.0.245
124	10.4.0.246/31	10.4.0.246 – 10.4.0.247	10.4.0.247
125	10.4.0.248/31	10.4.0.248 – 10.4.0.249	10.4.0.249
126	10.4.0.250/31	10.4.0.250 – 10.4.0.251	10.4.0.251
127	10.4.0.252/31	10.4.0.252 – 10.4.0.253	10.4.0.253
128	10.4.0.254/31	10.4.0.254 – 10.4.0.255	10.4.0.255
129	10.4.1.0/31	10.4.1.0 – 10.4.1.1	10.4.1.1
130	10.4.1.2/31	10.4.1.2 – 10.4.1.3	10.4.1.3
131	10.4.1.4/31	10.4.1.4 – 10.4.1.5	10.4.1.5
132	10.4.1.6/31	10.4.1.6 – 10.4.1.7	10.4.1.7
133	10.4.1.8/31	10.4.1.8 – 10.4.1.9	10.4.1.9
134	10.4.1.10/31	10.4.1.10 – 10.4.1.11	10.4.1.11
135	10.4.1.12/31	10.4.1.12 – 10.4.1.13	10.4.1.13
136	10.4.1.14/31	10.4.1.14 – 10.4.1.15	10.4.1.15
137	10.4.1.16/31	10.4.1.16 – 10.4.1.17	10.4.1.17
138	10.4.1.18/31	10.4.1.18 – 10.4.1.19	10.4.1.19
139	10.4.1.20/31	10.4.1.20 – 10.4.1.21	10.4.1.21
140	10.4.1.22/31	10.4.1.22 – 10.4.1.23	10.4.1.23
141	10.4.1.24/31	10.4.1.24 – 10.4.1.25	10.4.1.25
142	10.4.1.26/31	10.4.1.26 – 10.4.1.27	10.4.1.27
143	10.4.1.28/31	10.4.1.28 – 10.4.1.29	10.4.1.29
144	10.4.1.30/31	10.4.1.30 – 10.4.1.31	10.4.1.31
145	10.4.1.32/31	10.4.1.32 – 10.4.1.33	10.4.1.33
146	10.4.1.34/31	10.4.1.34 – 10.4.1.35	10.4.1.35
147	10.4.1.36/31	10.4.1.36 – 10.4.1.37	10.4.1.37
148	10.4.1.38/31	10.4.1.38 – 10.4.1.39	10.4.1.39
149	10.4.1.40/31	10.4.1.40 – 10.4.1.41	10.4.1.41
150	10.4.1.42/31	10.4.1.42 – 10.4.1.43	10.4.1.43
151	10.4.1.44/31	10.4.1.44 – 10.4.1.45	10.4.1.45
152	10.4.1.46/31	10.4.1.46 – 10.4.1.47	10.4.1.47
153	10.4.1.48/31	10.4.1.48 – 10.4.1.49	10.4.1.49
154	10.4.1.50/31	10.4.1.50 – 10.4.1.51	10.4.1.51
155	10.4.1.52/31	10.4.1.52 – 10.4.1.53	10.4.1.53
156	10.4.1.54/31	10.4.1.54 – 10.4.1.55	10.4.1.55
157	10.4.1.56/31	10.4.1.56 – 10.4.1.57	10.4.1.57
158	10.4.1.58/31	10.4.1.58 – 10.4.1.59	10.4.1.59
159	10.4.1.60/31	10.4.1.60 – 10.4.1.61	10.4.1.61
160	10.4.1.62/31	10.4.1.62 – 10.4.1.63	10.4.1.63
161	10.4.1.64/31	10.4.1.64 – 10.4.1.65	10.4.1.65
162	10.4.1.66/31	10.4.1.66 – 10.4.1.67	10.4.1.67
163	10.4.1.68/31	10.4.1.68 – 10.4.1.69	10.4.1.69
164	10.4.1.70/31	10.4.1.70 – 10.4.1.71	10.4.1.71
165	10.4.1.72/31	10.4.1.72 – 10.4.1.73	10.4.1.73
166	10.4.1.74/31	10.4.1.74 – 10.4.1.75	10.4.1.75
167	10.4.1.76/31	10.4.1.76 – 10.4.1.77	10.4.1.77
168	10.4.1.78/31	10.4.1.78 – 10.4.1.79	10.4.1.79
169	10.4.1.80/31	10.4.1.80 – 10.4.1.81	10.4.1.81
170	10.4.1.82/31	10.4.1.82 – 10.4.1.83	10.4.1.83
171	10.4.1.84/31	10.4.1.84 – 10.4.1.85	10.4.1.85
172	10.4.1.86/31	10.4.1.86 – 10.4.1.87	10.4.1.87
173	10.4.1.88/31	10.4.1.88 – 10.4.1.89	10.4.1.89
174	10.4.1.90/31	10.4.1.90 – 10.4.1.91	10.4.1.91
175	10.4.1.92/31	10.4.1.92 – 10.4.1.93	10.4.1.93
176	10.4.1.94/31	10.4.1.94 – 10.4.1.95	10.4.1.95
177	10.4.1.96/31	10.4.1.96 – 10.4.1.97	10.4.1.97
178	10.4.1.98/31	10.4.1.98 – 10.4.1.99	10.4.1.99
179	10.4.1.100/31	10.4.1.100 – 10.4.1.101	10.4.1.101
180	10.4.1.102/31	10.4.1.102 – 10.4.1.103	10.4.1.103
181	10.4.1.104/31	10.4.1.104 – 10.4.1.105	10.4.1.105
182	10.4.1.106/31	10.4.1.106 – 10.4.1.107	10.4.1.107
183	10.4.1.108/31	10.4.1.108 – 10.4.1.109	10.4.1.109
184	10.4.1.110/31	10.4.1.110 – 10.4.1.111	10.4.1.111
185	10.4.1.112/31	10.4.1.112 – 10.4.1.113	10.4.1.113
186	10.4.1.114/31	10.4.1.114 – 10.4.1.115	10.4.1.115
187	10.4.1.116/31	10.4.1.116 – 10.4.1.117	10.4.1.117
188	10.4.1.118/31	10.4.1.118 – 10.4.1.119	10.4.1.119
189	10.4.1.120/31	10.4.1.120 – 10.4.1.121	10.4.1.121
190	10.4.1.122/31	10.4.1.122 – 10.4.1.123	10.4.1.123
191	10.4.1.124/31	10.4.1.124 – 10.4.1.125	10.4.1.125
192	10.4.1.126/31	10.4.1.126 – 10.4.1.127	10.4.1.127
193	10.4.1.128/31	10.4.1.128 – 10.4.1.129	10.4.1.129
194	10.4.1.130/31	10.4.1.130 – 10.4.1.131	10.4.1.131
195	10.4.1.132/31	10.4.1.132 – 10.4.1.133	10.4.1.133
196	10.4.1.134/31	10.4.1.134 – 10.4.1.135	10.4.1.135
197	10.4.1.136/31	10.4.1.136 – 10.4.1.137	10.4.1.137
198	10.4.1.138/31	10.4.1.138 – 10.4.1.139	10.4.1.139
199	10.4.1.140/31	10.4.1.140 – 10.4.1.141	10.4.1.141
200	10.4.1.142/31	10.4.1.142 – 10.4.1.143	10.4.1.143
201	10.4.1.144/31	10.4.1.144 – 10.4.1.145	10.4.1.145
202	10.4.1.146/31	10.4.1.146 – 10.4.1.147	10.4.1.147
203	10.4.1.148/31	10.4.1.148 – 10.4.1.149	10.4.1.149
204	10.4.1.150/31	10.4.1.150 – 10.4.1.151	10.4.1.151
205	10.4.1.152/31	10.4.1.152 – 10.4.1.153	10.4.1.153
206	10.4.1.154/31	10.4.1.154 – 10.4.1.155	10.4.1.155
207	10.4.1.156/31	10.4.1.156 – 10.4.1.157	10.4.1.157
208	10.4.1.158/31	10.4.1.158 – 10.4.1.159	10.4.1.159
209	10.4.1.160/31	10.4.1.160 – 10.4.1.161	10.4.1.161
210	10.4.1.162/31	10.4.1.162 – 10.4.1.163	10.4.1.163
211	10.4.1.164/31	10.4.1.164 – 10.4.1.165	10.4.1.165
212	10.4.1.166/31	10.4.1.166 – 10.4.1.167	10.4.1.167
213	10.4.1.168/31	10.4.1.168 – 10.4.1.169	10.4.1.169
214	10.4.1.170/31	10.4.1.170 – 10.4.1.171	10.4.1.171
215	10.4.1.172/31	10.4.1.172 – 10.4.1.173	10.4.1.173
216	10.4.1.174/31	10.4.1.174 – 10.4.1.175	10.4.1.175
217	10.4.1.176/31	10.4.1.176 – 10.4.1.177	10.4.1.177
218	10.4.1.178/31	10.4.1.178 – 10.4.1.179	10.4.1.179
219	10.4.1.180/31	10.4.1.180 – 10.4.1.181	10.4.1.181
220	10.4.1.182/31	10.4.1.182 – 10.4.1.183	10.4.1.183
221	10.4.1.184/31	10.4.1.184 – 10.4.1.185	10.4.1.185
222	10.4.1.186/31	10.4.1.186 – 10.4.1.187	10.4.1.187
223	10.4.1.188/31	10.4.1.188 – 10.4.1.189	10.4.1.189
224	10.4.1.190/31	10.4.1.190 – 10.4.1.191	10.4.1.191
225	10.4.1.192/31	10.4.1.192 – 10.4.1.193	10.4.1.193
226	10.4.1.194/31	10.4.1.194 – 10.4.1.195	10.4.1.195
227	10.4.1.196/31	10.4.1.196 – 10.4.1.197	10.4.1.197
228	10.4.1.198/31	10.4.1.198 – 10.4.1.199	10.4.1.199
229	10.4.1.200/31	10.4.1.200 – 10.4.1.201	10.4.1.201
230	10.4.1.202/31	10.4.1.202 – 10.4.1.203	10.4.1.203
231	10.4.1.204/31	10.4.1.204 – 10.4.1.205	10.4.1.205
232	10.4.1.206/31	10.4.1.206 – 10.4.1.207	10.4.1.207
233	10.4.1.208/31	10.4.1.208 – 10.4.1.209	10.4.1.209
234	10.4.1.210/31	10.4.1.210 – 10.4.1.211	10.4.1.211
235	10.4.1.212/31	10.4.1.212 – 10.4.1.213	10.4.1.213
236	10.4.1.214/31	10.4.1.214 – 10.4.1.215	10.4.1.215
237	10.4.1.216/31	10.4.1.216 – 10.4.1.217	10.4.1.217
238	10.4.1.218/31	10.4.1.218 – 10.4.1.219	10.4.1.219
239	10.4.1.220/31	10.4.1.220 – 10.4.1.221	10.4.1.221
240	10.4.1.222/31	10.4.1.222 – 10.4.1.223	10.4.1.223
241	10.4.1.224/31	10.4.1.224 – 10.4.1.225	10.4.1.225
242	10.4.1.226/31	10.4.1.226 – 10.4.1.227	10.4.1.227
243	10.4.1.228/31	10.4.1.228 – 10.4.1.229	10.4.1.229
244	10.4.1.230/31	10.4.1.230 – 10.4.1.231	10.4.1.231
245	10.4.1.232/31	10.4.1.232 – 10.4.1.233	10.4.1.233
246	10.4.1.234/31	10.4.1.234 – 10.4.1.235	10.4.1.235
247	10.4.1.236/31	10.4.1.236 – 10.4.1.237	10.4.1.237
248	10.4.1.238/31	10.4.1.238 – 10.4.1.239	10.4.1.239
249	10.4.1.240/31	10.4.1.240 – 10.4.1.241	10.4.1.241
250	10.4.1.242/31	10.4.1.242 – 10.4.1.243	10.4.1.243
251	10.4.1.244/31	10.4.1.244 – 10.4.1.245	10.4.1.245
252	10.4.1.246/31	10.4.1.246 – 10.4.1.247	10.4.1.247
253	10.4.1.248/31	10.4.1.248 – 10.4.1.249	10.4.1.249
254	10.4.1.250/31	10.4.1.250 – 10.4.1.251	10.4.1.251
255	10.4.1.252/31	10.4.1.252 – 10.4.1.253	10.4.1.253
256	10.4.1.254/31	10.4.1.254 – 10.4.1.255	10.4.1.255

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 →