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)10.4.168.0/21

network10.4.168.0/21

broadcast10.4.175.255

first host10.4.168.1

last host10.4.175.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.168.0/21

address00001010.00000100.10101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.10101000.00000000

broadcast00001010.00000100.10101111.11111111

green = network part, grey = host part

hex0x0a04a800

decimal168077312

reverse dns0.168.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:a800

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.4.168.0/32	10.4.168.0 – 10.4.168.0	10.4.168.0
2	10.4.168.1/32	10.4.168.1 – 10.4.168.1	10.4.168.1
3	10.4.168.2/32	10.4.168.2 – 10.4.168.2	10.4.168.2
4	10.4.168.3/32	10.4.168.3 – 10.4.168.3	10.4.168.3
5	10.4.168.4/32	10.4.168.4 – 10.4.168.4	10.4.168.4
6	10.4.168.5/32	10.4.168.5 – 10.4.168.5	10.4.168.5
7	10.4.168.6/32	10.4.168.6 – 10.4.168.6	10.4.168.6
8	10.4.168.7/32	10.4.168.7 – 10.4.168.7	10.4.168.7
9	10.4.168.8/32	10.4.168.8 – 10.4.168.8	10.4.168.8
10	10.4.168.9/32	10.4.168.9 – 10.4.168.9	10.4.168.9
11	10.4.168.10/32	10.4.168.10 – 10.4.168.10	10.4.168.10
12	10.4.168.11/32	10.4.168.11 – 10.4.168.11	10.4.168.11
13	10.4.168.12/32	10.4.168.12 – 10.4.168.12	10.4.168.12
14	10.4.168.13/32	10.4.168.13 – 10.4.168.13	10.4.168.13
15	10.4.168.14/32	10.4.168.14 – 10.4.168.14	10.4.168.14
16	10.4.168.15/32	10.4.168.15 – 10.4.168.15	10.4.168.15
17	10.4.168.16/32	10.4.168.16 – 10.4.168.16	10.4.168.16
18	10.4.168.17/32	10.4.168.17 – 10.4.168.17	10.4.168.17
19	10.4.168.18/32	10.4.168.18 – 10.4.168.18	10.4.168.18
20	10.4.168.19/32	10.4.168.19 – 10.4.168.19	10.4.168.19
21	10.4.168.20/32	10.4.168.20 – 10.4.168.20	10.4.168.20
22	10.4.168.21/32	10.4.168.21 – 10.4.168.21	10.4.168.21
23	10.4.168.22/32	10.4.168.22 – 10.4.168.22	10.4.168.22
24	10.4.168.23/32	10.4.168.23 – 10.4.168.23	10.4.168.23
25	10.4.168.24/32	10.4.168.24 – 10.4.168.24	10.4.168.24
26	10.4.168.25/32	10.4.168.25 – 10.4.168.25	10.4.168.25
27	10.4.168.26/32	10.4.168.26 – 10.4.168.26	10.4.168.26
28	10.4.168.27/32	10.4.168.27 – 10.4.168.27	10.4.168.27
29	10.4.168.28/32	10.4.168.28 – 10.4.168.28	10.4.168.28
30	10.4.168.29/32	10.4.168.29 – 10.4.168.29	10.4.168.29
31	10.4.168.30/32	10.4.168.30 – 10.4.168.30	10.4.168.30
32	10.4.168.31/32	10.4.168.31 – 10.4.168.31	10.4.168.31
33	10.4.168.32/32	10.4.168.32 – 10.4.168.32	10.4.168.32
34	10.4.168.33/32	10.4.168.33 – 10.4.168.33	10.4.168.33
35	10.4.168.34/32	10.4.168.34 – 10.4.168.34	10.4.168.34
36	10.4.168.35/32	10.4.168.35 – 10.4.168.35	10.4.168.35
37	10.4.168.36/32	10.4.168.36 – 10.4.168.36	10.4.168.36
38	10.4.168.37/32	10.4.168.37 – 10.4.168.37	10.4.168.37
39	10.4.168.38/32	10.4.168.38 – 10.4.168.38	10.4.168.38
40	10.4.168.39/32	10.4.168.39 – 10.4.168.39	10.4.168.39
41	10.4.168.40/32	10.4.168.40 – 10.4.168.40	10.4.168.40
42	10.4.168.41/32	10.4.168.41 – 10.4.168.41	10.4.168.41
43	10.4.168.42/32	10.4.168.42 – 10.4.168.42	10.4.168.42
44	10.4.168.43/32	10.4.168.43 – 10.4.168.43	10.4.168.43
45	10.4.168.44/32	10.4.168.44 – 10.4.168.44	10.4.168.44
46	10.4.168.45/32	10.4.168.45 – 10.4.168.45	10.4.168.45
47	10.4.168.46/32	10.4.168.46 – 10.4.168.46	10.4.168.46
48	10.4.168.47/32	10.4.168.47 – 10.4.168.47	10.4.168.47
49	10.4.168.48/32	10.4.168.48 – 10.4.168.48	10.4.168.48
50	10.4.168.49/32	10.4.168.49 – 10.4.168.49	10.4.168.49
51	10.4.168.50/32	10.4.168.50 – 10.4.168.50	10.4.168.50
52	10.4.168.51/32	10.4.168.51 – 10.4.168.51	10.4.168.51
53	10.4.168.52/32	10.4.168.52 – 10.4.168.52	10.4.168.52
54	10.4.168.53/32	10.4.168.53 – 10.4.168.53	10.4.168.53
55	10.4.168.54/32	10.4.168.54 – 10.4.168.54	10.4.168.54
56	10.4.168.55/32	10.4.168.55 – 10.4.168.55	10.4.168.55
57	10.4.168.56/32	10.4.168.56 – 10.4.168.56	10.4.168.56
58	10.4.168.57/32	10.4.168.57 – 10.4.168.57	10.4.168.57
59	10.4.168.58/32	10.4.168.58 – 10.4.168.58	10.4.168.58
60	10.4.168.59/32	10.4.168.59 – 10.4.168.59	10.4.168.59
61	10.4.168.60/32	10.4.168.60 – 10.4.168.60	10.4.168.60
62	10.4.168.61/32	10.4.168.61 – 10.4.168.61	10.4.168.61
63	10.4.168.62/32	10.4.168.62 – 10.4.168.62	10.4.168.62
64	10.4.168.63/32	10.4.168.63 – 10.4.168.63	10.4.168.63
65	10.4.168.64/32	10.4.168.64 – 10.4.168.64	10.4.168.64
66	10.4.168.65/32	10.4.168.65 – 10.4.168.65	10.4.168.65
67	10.4.168.66/32	10.4.168.66 – 10.4.168.66	10.4.168.66
68	10.4.168.67/32	10.4.168.67 – 10.4.168.67	10.4.168.67
69	10.4.168.68/32	10.4.168.68 – 10.4.168.68	10.4.168.68
70	10.4.168.69/32	10.4.168.69 – 10.4.168.69	10.4.168.69
71	10.4.168.70/32	10.4.168.70 – 10.4.168.70	10.4.168.70
72	10.4.168.71/32	10.4.168.71 – 10.4.168.71	10.4.168.71
73	10.4.168.72/32	10.4.168.72 – 10.4.168.72	10.4.168.72
74	10.4.168.73/32	10.4.168.73 – 10.4.168.73	10.4.168.73
75	10.4.168.74/32	10.4.168.74 – 10.4.168.74	10.4.168.74
76	10.4.168.75/32	10.4.168.75 – 10.4.168.75	10.4.168.75
77	10.4.168.76/32	10.4.168.76 – 10.4.168.76	10.4.168.76
78	10.4.168.77/32	10.4.168.77 – 10.4.168.77	10.4.168.77
79	10.4.168.78/32	10.4.168.78 – 10.4.168.78	10.4.168.78
80	10.4.168.79/32	10.4.168.79 – 10.4.168.79	10.4.168.79
81	10.4.168.80/32	10.4.168.80 – 10.4.168.80	10.4.168.80
82	10.4.168.81/32	10.4.168.81 – 10.4.168.81	10.4.168.81
83	10.4.168.82/32	10.4.168.82 – 10.4.168.82	10.4.168.82
84	10.4.168.83/32	10.4.168.83 – 10.4.168.83	10.4.168.83
85	10.4.168.84/32	10.4.168.84 – 10.4.168.84	10.4.168.84
86	10.4.168.85/32	10.4.168.85 – 10.4.168.85	10.4.168.85
87	10.4.168.86/32	10.4.168.86 – 10.4.168.86	10.4.168.86
88	10.4.168.87/32	10.4.168.87 – 10.4.168.87	10.4.168.87
89	10.4.168.88/32	10.4.168.88 – 10.4.168.88	10.4.168.88
90	10.4.168.89/32	10.4.168.89 – 10.4.168.89	10.4.168.89
91	10.4.168.90/32	10.4.168.90 – 10.4.168.90	10.4.168.90
92	10.4.168.91/32	10.4.168.91 – 10.4.168.91	10.4.168.91
93	10.4.168.92/32	10.4.168.92 – 10.4.168.92	10.4.168.92
94	10.4.168.93/32	10.4.168.93 – 10.4.168.93	10.4.168.93
95	10.4.168.94/32	10.4.168.94 – 10.4.168.94	10.4.168.94
96	10.4.168.95/32	10.4.168.95 – 10.4.168.95	10.4.168.95
97	10.4.168.96/32	10.4.168.96 – 10.4.168.96	10.4.168.96
98	10.4.168.97/32	10.4.168.97 – 10.4.168.97	10.4.168.97
99	10.4.168.98/32	10.4.168.98 – 10.4.168.98	10.4.168.98
100	10.4.168.99/32	10.4.168.99 – 10.4.168.99	10.4.168.99
101	10.4.168.100/32	10.4.168.100 – 10.4.168.100	10.4.168.100
102	10.4.168.101/32	10.4.168.101 – 10.4.168.101	10.4.168.101
103	10.4.168.102/32	10.4.168.102 – 10.4.168.102	10.4.168.102
104	10.4.168.103/32	10.4.168.103 – 10.4.168.103	10.4.168.103
105	10.4.168.104/32	10.4.168.104 – 10.4.168.104	10.4.168.104
106	10.4.168.105/32	10.4.168.105 – 10.4.168.105	10.4.168.105
107	10.4.168.106/32	10.4.168.106 – 10.4.168.106	10.4.168.106
108	10.4.168.107/32	10.4.168.107 – 10.4.168.107	10.4.168.107
109	10.4.168.108/32	10.4.168.108 – 10.4.168.108	10.4.168.108
110	10.4.168.109/32	10.4.168.109 – 10.4.168.109	10.4.168.109
111	10.4.168.110/32	10.4.168.110 – 10.4.168.110	10.4.168.110
112	10.4.168.111/32	10.4.168.111 – 10.4.168.111	10.4.168.111
113	10.4.168.112/32	10.4.168.112 – 10.4.168.112	10.4.168.112
114	10.4.168.113/32	10.4.168.113 – 10.4.168.113	10.4.168.113
115	10.4.168.114/32	10.4.168.114 – 10.4.168.114	10.4.168.114
116	10.4.168.115/32	10.4.168.115 – 10.4.168.115	10.4.168.115
117	10.4.168.116/32	10.4.168.116 – 10.4.168.116	10.4.168.116
118	10.4.168.117/32	10.4.168.117 – 10.4.168.117	10.4.168.117
119	10.4.168.118/32	10.4.168.118 – 10.4.168.118	10.4.168.118
120	10.4.168.119/32	10.4.168.119 – 10.4.168.119	10.4.168.119
121	10.4.168.120/32	10.4.168.120 – 10.4.168.120	10.4.168.120
122	10.4.168.121/32	10.4.168.121 – 10.4.168.121	10.4.168.121
123	10.4.168.122/32	10.4.168.122 – 10.4.168.122	10.4.168.122
124	10.4.168.123/32	10.4.168.123 – 10.4.168.123	10.4.168.123
125	10.4.168.124/32	10.4.168.124 – 10.4.168.124	10.4.168.124
126	10.4.168.125/32	10.4.168.125 – 10.4.168.125	10.4.168.125
127	10.4.168.126/32	10.4.168.126 – 10.4.168.126	10.4.168.126
128	10.4.168.127/32	10.4.168.127 – 10.4.168.127	10.4.168.127
129	10.4.168.128/32	10.4.168.128 – 10.4.168.128	10.4.168.128
130	10.4.168.129/32	10.4.168.129 – 10.4.168.129	10.4.168.129
131	10.4.168.130/32	10.4.168.130 – 10.4.168.130	10.4.168.130
132	10.4.168.131/32	10.4.168.131 – 10.4.168.131	10.4.168.131
133	10.4.168.132/32	10.4.168.132 – 10.4.168.132	10.4.168.132
134	10.4.168.133/32	10.4.168.133 – 10.4.168.133	10.4.168.133
135	10.4.168.134/32	10.4.168.134 – 10.4.168.134	10.4.168.134
136	10.4.168.135/32	10.4.168.135 – 10.4.168.135	10.4.168.135
137	10.4.168.136/32	10.4.168.136 – 10.4.168.136	10.4.168.136
138	10.4.168.137/32	10.4.168.137 – 10.4.168.137	10.4.168.137
139	10.4.168.138/32	10.4.168.138 – 10.4.168.138	10.4.168.138
140	10.4.168.139/32	10.4.168.139 – 10.4.168.139	10.4.168.139
141	10.4.168.140/32	10.4.168.140 – 10.4.168.140	10.4.168.140
142	10.4.168.141/32	10.4.168.141 – 10.4.168.141	10.4.168.141
143	10.4.168.142/32	10.4.168.142 – 10.4.168.142	10.4.168.142
144	10.4.168.143/32	10.4.168.143 – 10.4.168.143	10.4.168.143
145	10.4.168.144/32	10.4.168.144 – 10.4.168.144	10.4.168.144
146	10.4.168.145/32	10.4.168.145 – 10.4.168.145	10.4.168.145
147	10.4.168.146/32	10.4.168.146 – 10.4.168.146	10.4.168.146
148	10.4.168.147/32	10.4.168.147 – 10.4.168.147	10.4.168.147
149	10.4.168.148/32	10.4.168.148 – 10.4.168.148	10.4.168.148
150	10.4.168.149/32	10.4.168.149 – 10.4.168.149	10.4.168.149
151	10.4.168.150/32	10.4.168.150 – 10.4.168.150	10.4.168.150
152	10.4.168.151/32	10.4.168.151 – 10.4.168.151	10.4.168.151
153	10.4.168.152/32	10.4.168.152 – 10.4.168.152	10.4.168.152
154	10.4.168.153/32	10.4.168.153 – 10.4.168.153	10.4.168.153
155	10.4.168.154/32	10.4.168.154 – 10.4.168.154	10.4.168.154
156	10.4.168.155/32	10.4.168.155 – 10.4.168.155	10.4.168.155
157	10.4.168.156/32	10.4.168.156 – 10.4.168.156	10.4.168.156
158	10.4.168.157/32	10.4.168.157 – 10.4.168.157	10.4.168.157
159	10.4.168.158/32	10.4.168.158 – 10.4.168.158	10.4.168.158
160	10.4.168.159/32	10.4.168.159 – 10.4.168.159	10.4.168.159
161	10.4.168.160/32	10.4.168.160 – 10.4.168.160	10.4.168.160
162	10.4.168.161/32	10.4.168.161 – 10.4.168.161	10.4.168.161
163	10.4.168.162/32	10.4.168.162 – 10.4.168.162	10.4.168.162
164	10.4.168.163/32	10.4.168.163 – 10.4.168.163	10.4.168.163
165	10.4.168.164/32	10.4.168.164 – 10.4.168.164	10.4.168.164
166	10.4.168.165/32	10.4.168.165 – 10.4.168.165	10.4.168.165
167	10.4.168.166/32	10.4.168.166 – 10.4.168.166	10.4.168.166
168	10.4.168.167/32	10.4.168.167 – 10.4.168.167	10.4.168.167
169	10.4.168.168/32	10.4.168.168 – 10.4.168.168	10.4.168.168
170	10.4.168.169/32	10.4.168.169 – 10.4.168.169	10.4.168.169
171	10.4.168.170/32	10.4.168.170 – 10.4.168.170	10.4.168.170
172	10.4.168.171/32	10.4.168.171 – 10.4.168.171	10.4.168.171
173	10.4.168.172/32	10.4.168.172 – 10.4.168.172	10.4.168.172
174	10.4.168.173/32	10.4.168.173 – 10.4.168.173	10.4.168.173
175	10.4.168.174/32	10.4.168.174 – 10.4.168.174	10.4.168.174
176	10.4.168.175/32	10.4.168.175 – 10.4.168.175	10.4.168.175
177	10.4.168.176/32	10.4.168.176 – 10.4.168.176	10.4.168.176
178	10.4.168.177/32	10.4.168.177 – 10.4.168.177	10.4.168.177
179	10.4.168.178/32	10.4.168.178 – 10.4.168.178	10.4.168.178
180	10.4.168.179/32	10.4.168.179 – 10.4.168.179	10.4.168.179
181	10.4.168.180/32	10.4.168.180 – 10.4.168.180	10.4.168.180
182	10.4.168.181/32	10.4.168.181 – 10.4.168.181	10.4.168.181
183	10.4.168.182/32	10.4.168.182 – 10.4.168.182	10.4.168.182
184	10.4.168.183/32	10.4.168.183 – 10.4.168.183	10.4.168.183
185	10.4.168.184/32	10.4.168.184 – 10.4.168.184	10.4.168.184
186	10.4.168.185/32	10.4.168.185 – 10.4.168.185	10.4.168.185
187	10.4.168.186/32	10.4.168.186 – 10.4.168.186	10.4.168.186
188	10.4.168.187/32	10.4.168.187 – 10.4.168.187	10.4.168.187
189	10.4.168.188/32	10.4.168.188 – 10.4.168.188	10.4.168.188
190	10.4.168.189/32	10.4.168.189 – 10.4.168.189	10.4.168.189
191	10.4.168.190/32	10.4.168.190 – 10.4.168.190	10.4.168.190
192	10.4.168.191/32	10.4.168.191 – 10.4.168.191	10.4.168.191
193	10.4.168.192/32	10.4.168.192 – 10.4.168.192	10.4.168.192
194	10.4.168.193/32	10.4.168.193 – 10.4.168.193	10.4.168.193
195	10.4.168.194/32	10.4.168.194 – 10.4.168.194	10.4.168.194
196	10.4.168.195/32	10.4.168.195 – 10.4.168.195	10.4.168.195
197	10.4.168.196/32	10.4.168.196 – 10.4.168.196	10.4.168.196
198	10.4.168.197/32	10.4.168.197 – 10.4.168.197	10.4.168.197
199	10.4.168.198/32	10.4.168.198 – 10.4.168.198	10.4.168.198
200	10.4.168.199/32	10.4.168.199 – 10.4.168.199	10.4.168.199
201	10.4.168.200/32	10.4.168.200 – 10.4.168.200	10.4.168.200
202	10.4.168.201/32	10.4.168.201 – 10.4.168.201	10.4.168.201
203	10.4.168.202/32	10.4.168.202 – 10.4.168.202	10.4.168.202
204	10.4.168.203/32	10.4.168.203 – 10.4.168.203	10.4.168.203
205	10.4.168.204/32	10.4.168.204 – 10.4.168.204	10.4.168.204
206	10.4.168.205/32	10.4.168.205 – 10.4.168.205	10.4.168.205
207	10.4.168.206/32	10.4.168.206 – 10.4.168.206	10.4.168.206
208	10.4.168.207/32	10.4.168.207 – 10.4.168.207	10.4.168.207
209	10.4.168.208/32	10.4.168.208 – 10.4.168.208	10.4.168.208
210	10.4.168.209/32	10.4.168.209 – 10.4.168.209	10.4.168.209
211	10.4.168.210/32	10.4.168.210 – 10.4.168.210	10.4.168.210
212	10.4.168.211/32	10.4.168.211 – 10.4.168.211	10.4.168.211
213	10.4.168.212/32	10.4.168.212 – 10.4.168.212	10.4.168.212
214	10.4.168.213/32	10.4.168.213 – 10.4.168.213	10.4.168.213
215	10.4.168.214/32	10.4.168.214 – 10.4.168.214	10.4.168.214
216	10.4.168.215/32	10.4.168.215 – 10.4.168.215	10.4.168.215
217	10.4.168.216/32	10.4.168.216 – 10.4.168.216	10.4.168.216
218	10.4.168.217/32	10.4.168.217 – 10.4.168.217	10.4.168.217
219	10.4.168.218/32	10.4.168.218 – 10.4.168.218	10.4.168.218
220	10.4.168.219/32	10.4.168.219 – 10.4.168.219	10.4.168.219
221	10.4.168.220/32	10.4.168.220 – 10.4.168.220	10.4.168.220
222	10.4.168.221/32	10.4.168.221 – 10.4.168.221	10.4.168.221
223	10.4.168.222/32	10.4.168.222 – 10.4.168.222	10.4.168.222
224	10.4.168.223/32	10.4.168.223 – 10.4.168.223	10.4.168.223
225	10.4.168.224/32	10.4.168.224 – 10.4.168.224	10.4.168.224
226	10.4.168.225/32	10.4.168.225 – 10.4.168.225	10.4.168.225
227	10.4.168.226/32	10.4.168.226 – 10.4.168.226	10.4.168.226
228	10.4.168.227/32	10.4.168.227 – 10.4.168.227	10.4.168.227
229	10.4.168.228/32	10.4.168.228 – 10.4.168.228	10.4.168.228
230	10.4.168.229/32	10.4.168.229 – 10.4.168.229	10.4.168.229
231	10.4.168.230/32	10.4.168.230 – 10.4.168.230	10.4.168.230
232	10.4.168.231/32	10.4.168.231 – 10.4.168.231	10.4.168.231
233	10.4.168.232/32	10.4.168.232 – 10.4.168.232	10.4.168.232
234	10.4.168.233/32	10.4.168.233 – 10.4.168.233	10.4.168.233
235	10.4.168.234/32	10.4.168.234 – 10.4.168.234	10.4.168.234
236	10.4.168.235/32	10.4.168.235 – 10.4.168.235	10.4.168.235
237	10.4.168.236/32	10.4.168.236 – 10.4.168.236	10.4.168.236
238	10.4.168.237/32	10.4.168.237 – 10.4.168.237	10.4.168.237
239	10.4.168.238/32	10.4.168.238 – 10.4.168.238	10.4.168.238
240	10.4.168.239/32	10.4.168.239 – 10.4.168.239	10.4.168.239
241	10.4.168.240/32	10.4.168.240 – 10.4.168.240	10.4.168.240
242	10.4.168.241/32	10.4.168.241 – 10.4.168.241	10.4.168.241
243	10.4.168.242/32	10.4.168.242 – 10.4.168.242	10.4.168.242
244	10.4.168.243/32	10.4.168.243 – 10.4.168.243	10.4.168.243
245	10.4.168.244/32	10.4.168.244 – 10.4.168.244	10.4.168.244
246	10.4.168.245/32	10.4.168.245 – 10.4.168.245	10.4.168.245
247	10.4.168.246/32	10.4.168.246 – 10.4.168.246	10.4.168.246
248	10.4.168.247/32	10.4.168.247 – 10.4.168.247	10.4.168.247
249	10.4.168.248/32	10.4.168.248 – 10.4.168.248	10.4.168.248
250	10.4.168.249/32	10.4.168.249 – 10.4.168.249	10.4.168.249
251	10.4.168.250/32	10.4.168.250 – 10.4.168.250	10.4.168.250
252	10.4.168.251/32	10.4.168.251 – 10.4.168.251	10.4.168.251
253	10.4.168.252/32	10.4.168.252 – 10.4.168.252	10.4.168.252
254	10.4.168.253/32	10.4.168.253 – 10.4.168.253	10.4.168.253
255	10.4.168.254/32	10.4.168.254 – 10.4.168.254	10.4.168.254
256	10.4.168.255/32	10.4.168.255 – 10.4.168.255	10.4.168.255

showing 256 of 2,048

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 →