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)10.5.24.0/21

network10.5.24.0/21

broadcast10.5.31.255

first host10.5.24.1

last host10.5.31.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.24.0/21

address00001010.00000101.00011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.00011000.00000000

broadcast00001010.00000101.00011111.11111111

green = network part, grey = host part

hex0x0a051800

decimal168105984

reverse dns0.24.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:1800

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.5.24.0/32	10.5.24.0 – 10.5.24.0	10.5.24.0
2	10.5.24.1/32	10.5.24.1 – 10.5.24.1	10.5.24.1
3	10.5.24.2/32	10.5.24.2 – 10.5.24.2	10.5.24.2
4	10.5.24.3/32	10.5.24.3 – 10.5.24.3	10.5.24.3
5	10.5.24.4/32	10.5.24.4 – 10.5.24.4	10.5.24.4
6	10.5.24.5/32	10.5.24.5 – 10.5.24.5	10.5.24.5
7	10.5.24.6/32	10.5.24.6 – 10.5.24.6	10.5.24.6
8	10.5.24.7/32	10.5.24.7 – 10.5.24.7	10.5.24.7
9	10.5.24.8/32	10.5.24.8 – 10.5.24.8	10.5.24.8
10	10.5.24.9/32	10.5.24.9 – 10.5.24.9	10.5.24.9
11	10.5.24.10/32	10.5.24.10 – 10.5.24.10	10.5.24.10
12	10.5.24.11/32	10.5.24.11 – 10.5.24.11	10.5.24.11
13	10.5.24.12/32	10.5.24.12 – 10.5.24.12	10.5.24.12
14	10.5.24.13/32	10.5.24.13 – 10.5.24.13	10.5.24.13
15	10.5.24.14/32	10.5.24.14 – 10.5.24.14	10.5.24.14
16	10.5.24.15/32	10.5.24.15 – 10.5.24.15	10.5.24.15
17	10.5.24.16/32	10.5.24.16 – 10.5.24.16	10.5.24.16
18	10.5.24.17/32	10.5.24.17 – 10.5.24.17	10.5.24.17
19	10.5.24.18/32	10.5.24.18 – 10.5.24.18	10.5.24.18
20	10.5.24.19/32	10.5.24.19 – 10.5.24.19	10.5.24.19
21	10.5.24.20/32	10.5.24.20 – 10.5.24.20	10.5.24.20
22	10.5.24.21/32	10.5.24.21 – 10.5.24.21	10.5.24.21
23	10.5.24.22/32	10.5.24.22 – 10.5.24.22	10.5.24.22
24	10.5.24.23/32	10.5.24.23 – 10.5.24.23	10.5.24.23
25	10.5.24.24/32	10.5.24.24 – 10.5.24.24	10.5.24.24
26	10.5.24.25/32	10.5.24.25 – 10.5.24.25	10.5.24.25
27	10.5.24.26/32	10.5.24.26 – 10.5.24.26	10.5.24.26
28	10.5.24.27/32	10.5.24.27 – 10.5.24.27	10.5.24.27
29	10.5.24.28/32	10.5.24.28 – 10.5.24.28	10.5.24.28
30	10.5.24.29/32	10.5.24.29 – 10.5.24.29	10.5.24.29
31	10.5.24.30/32	10.5.24.30 – 10.5.24.30	10.5.24.30
32	10.5.24.31/32	10.5.24.31 – 10.5.24.31	10.5.24.31
33	10.5.24.32/32	10.5.24.32 – 10.5.24.32	10.5.24.32
34	10.5.24.33/32	10.5.24.33 – 10.5.24.33	10.5.24.33
35	10.5.24.34/32	10.5.24.34 – 10.5.24.34	10.5.24.34
36	10.5.24.35/32	10.5.24.35 – 10.5.24.35	10.5.24.35
37	10.5.24.36/32	10.5.24.36 – 10.5.24.36	10.5.24.36
38	10.5.24.37/32	10.5.24.37 – 10.5.24.37	10.5.24.37
39	10.5.24.38/32	10.5.24.38 – 10.5.24.38	10.5.24.38
40	10.5.24.39/32	10.5.24.39 – 10.5.24.39	10.5.24.39
41	10.5.24.40/32	10.5.24.40 – 10.5.24.40	10.5.24.40
42	10.5.24.41/32	10.5.24.41 – 10.5.24.41	10.5.24.41
43	10.5.24.42/32	10.5.24.42 – 10.5.24.42	10.5.24.42
44	10.5.24.43/32	10.5.24.43 – 10.5.24.43	10.5.24.43
45	10.5.24.44/32	10.5.24.44 – 10.5.24.44	10.5.24.44
46	10.5.24.45/32	10.5.24.45 – 10.5.24.45	10.5.24.45
47	10.5.24.46/32	10.5.24.46 – 10.5.24.46	10.5.24.46
48	10.5.24.47/32	10.5.24.47 – 10.5.24.47	10.5.24.47
49	10.5.24.48/32	10.5.24.48 – 10.5.24.48	10.5.24.48
50	10.5.24.49/32	10.5.24.49 – 10.5.24.49	10.5.24.49
51	10.5.24.50/32	10.5.24.50 – 10.5.24.50	10.5.24.50
52	10.5.24.51/32	10.5.24.51 – 10.5.24.51	10.5.24.51
53	10.5.24.52/32	10.5.24.52 – 10.5.24.52	10.5.24.52
54	10.5.24.53/32	10.5.24.53 – 10.5.24.53	10.5.24.53
55	10.5.24.54/32	10.5.24.54 – 10.5.24.54	10.5.24.54
56	10.5.24.55/32	10.5.24.55 – 10.5.24.55	10.5.24.55
57	10.5.24.56/32	10.5.24.56 – 10.5.24.56	10.5.24.56
58	10.5.24.57/32	10.5.24.57 – 10.5.24.57	10.5.24.57
59	10.5.24.58/32	10.5.24.58 – 10.5.24.58	10.5.24.58
60	10.5.24.59/32	10.5.24.59 – 10.5.24.59	10.5.24.59
61	10.5.24.60/32	10.5.24.60 – 10.5.24.60	10.5.24.60
62	10.5.24.61/32	10.5.24.61 – 10.5.24.61	10.5.24.61
63	10.5.24.62/32	10.5.24.62 – 10.5.24.62	10.5.24.62
64	10.5.24.63/32	10.5.24.63 – 10.5.24.63	10.5.24.63
65	10.5.24.64/32	10.5.24.64 – 10.5.24.64	10.5.24.64
66	10.5.24.65/32	10.5.24.65 – 10.5.24.65	10.5.24.65
67	10.5.24.66/32	10.5.24.66 – 10.5.24.66	10.5.24.66
68	10.5.24.67/32	10.5.24.67 – 10.5.24.67	10.5.24.67
69	10.5.24.68/32	10.5.24.68 – 10.5.24.68	10.5.24.68
70	10.5.24.69/32	10.5.24.69 – 10.5.24.69	10.5.24.69
71	10.5.24.70/32	10.5.24.70 – 10.5.24.70	10.5.24.70
72	10.5.24.71/32	10.5.24.71 – 10.5.24.71	10.5.24.71
73	10.5.24.72/32	10.5.24.72 – 10.5.24.72	10.5.24.72
74	10.5.24.73/32	10.5.24.73 – 10.5.24.73	10.5.24.73
75	10.5.24.74/32	10.5.24.74 – 10.5.24.74	10.5.24.74
76	10.5.24.75/32	10.5.24.75 – 10.5.24.75	10.5.24.75
77	10.5.24.76/32	10.5.24.76 – 10.5.24.76	10.5.24.76
78	10.5.24.77/32	10.5.24.77 – 10.5.24.77	10.5.24.77
79	10.5.24.78/32	10.5.24.78 – 10.5.24.78	10.5.24.78
80	10.5.24.79/32	10.5.24.79 – 10.5.24.79	10.5.24.79
81	10.5.24.80/32	10.5.24.80 – 10.5.24.80	10.5.24.80
82	10.5.24.81/32	10.5.24.81 – 10.5.24.81	10.5.24.81
83	10.5.24.82/32	10.5.24.82 – 10.5.24.82	10.5.24.82
84	10.5.24.83/32	10.5.24.83 – 10.5.24.83	10.5.24.83
85	10.5.24.84/32	10.5.24.84 – 10.5.24.84	10.5.24.84
86	10.5.24.85/32	10.5.24.85 – 10.5.24.85	10.5.24.85
87	10.5.24.86/32	10.5.24.86 – 10.5.24.86	10.5.24.86
88	10.5.24.87/32	10.5.24.87 – 10.5.24.87	10.5.24.87
89	10.5.24.88/32	10.5.24.88 – 10.5.24.88	10.5.24.88
90	10.5.24.89/32	10.5.24.89 – 10.5.24.89	10.5.24.89
91	10.5.24.90/32	10.5.24.90 – 10.5.24.90	10.5.24.90
92	10.5.24.91/32	10.5.24.91 – 10.5.24.91	10.5.24.91
93	10.5.24.92/32	10.5.24.92 – 10.5.24.92	10.5.24.92
94	10.5.24.93/32	10.5.24.93 – 10.5.24.93	10.5.24.93
95	10.5.24.94/32	10.5.24.94 – 10.5.24.94	10.5.24.94
96	10.5.24.95/32	10.5.24.95 – 10.5.24.95	10.5.24.95
97	10.5.24.96/32	10.5.24.96 – 10.5.24.96	10.5.24.96
98	10.5.24.97/32	10.5.24.97 – 10.5.24.97	10.5.24.97
99	10.5.24.98/32	10.5.24.98 – 10.5.24.98	10.5.24.98
100	10.5.24.99/32	10.5.24.99 – 10.5.24.99	10.5.24.99
101	10.5.24.100/32	10.5.24.100 – 10.5.24.100	10.5.24.100
102	10.5.24.101/32	10.5.24.101 – 10.5.24.101	10.5.24.101
103	10.5.24.102/32	10.5.24.102 – 10.5.24.102	10.5.24.102
104	10.5.24.103/32	10.5.24.103 – 10.5.24.103	10.5.24.103
105	10.5.24.104/32	10.5.24.104 – 10.5.24.104	10.5.24.104
106	10.5.24.105/32	10.5.24.105 – 10.5.24.105	10.5.24.105
107	10.5.24.106/32	10.5.24.106 – 10.5.24.106	10.5.24.106
108	10.5.24.107/32	10.5.24.107 – 10.5.24.107	10.5.24.107
109	10.5.24.108/32	10.5.24.108 – 10.5.24.108	10.5.24.108
110	10.5.24.109/32	10.5.24.109 – 10.5.24.109	10.5.24.109
111	10.5.24.110/32	10.5.24.110 – 10.5.24.110	10.5.24.110
112	10.5.24.111/32	10.5.24.111 – 10.5.24.111	10.5.24.111
113	10.5.24.112/32	10.5.24.112 – 10.5.24.112	10.5.24.112
114	10.5.24.113/32	10.5.24.113 – 10.5.24.113	10.5.24.113
115	10.5.24.114/32	10.5.24.114 – 10.5.24.114	10.5.24.114
116	10.5.24.115/32	10.5.24.115 – 10.5.24.115	10.5.24.115
117	10.5.24.116/32	10.5.24.116 – 10.5.24.116	10.5.24.116
118	10.5.24.117/32	10.5.24.117 – 10.5.24.117	10.5.24.117
119	10.5.24.118/32	10.5.24.118 – 10.5.24.118	10.5.24.118
120	10.5.24.119/32	10.5.24.119 – 10.5.24.119	10.5.24.119
121	10.5.24.120/32	10.5.24.120 – 10.5.24.120	10.5.24.120
122	10.5.24.121/32	10.5.24.121 – 10.5.24.121	10.5.24.121
123	10.5.24.122/32	10.5.24.122 – 10.5.24.122	10.5.24.122
124	10.5.24.123/32	10.5.24.123 – 10.5.24.123	10.5.24.123
125	10.5.24.124/32	10.5.24.124 – 10.5.24.124	10.5.24.124
126	10.5.24.125/32	10.5.24.125 – 10.5.24.125	10.5.24.125
127	10.5.24.126/32	10.5.24.126 – 10.5.24.126	10.5.24.126
128	10.5.24.127/32	10.5.24.127 – 10.5.24.127	10.5.24.127
129	10.5.24.128/32	10.5.24.128 – 10.5.24.128	10.5.24.128
130	10.5.24.129/32	10.5.24.129 – 10.5.24.129	10.5.24.129
131	10.5.24.130/32	10.5.24.130 – 10.5.24.130	10.5.24.130
132	10.5.24.131/32	10.5.24.131 – 10.5.24.131	10.5.24.131
133	10.5.24.132/32	10.5.24.132 – 10.5.24.132	10.5.24.132
134	10.5.24.133/32	10.5.24.133 – 10.5.24.133	10.5.24.133
135	10.5.24.134/32	10.5.24.134 – 10.5.24.134	10.5.24.134
136	10.5.24.135/32	10.5.24.135 – 10.5.24.135	10.5.24.135
137	10.5.24.136/32	10.5.24.136 – 10.5.24.136	10.5.24.136
138	10.5.24.137/32	10.5.24.137 – 10.5.24.137	10.5.24.137
139	10.5.24.138/32	10.5.24.138 – 10.5.24.138	10.5.24.138
140	10.5.24.139/32	10.5.24.139 – 10.5.24.139	10.5.24.139
141	10.5.24.140/32	10.5.24.140 – 10.5.24.140	10.5.24.140
142	10.5.24.141/32	10.5.24.141 – 10.5.24.141	10.5.24.141
143	10.5.24.142/32	10.5.24.142 – 10.5.24.142	10.5.24.142
144	10.5.24.143/32	10.5.24.143 – 10.5.24.143	10.5.24.143
145	10.5.24.144/32	10.5.24.144 – 10.5.24.144	10.5.24.144
146	10.5.24.145/32	10.5.24.145 – 10.5.24.145	10.5.24.145
147	10.5.24.146/32	10.5.24.146 – 10.5.24.146	10.5.24.146
148	10.5.24.147/32	10.5.24.147 – 10.5.24.147	10.5.24.147
149	10.5.24.148/32	10.5.24.148 – 10.5.24.148	10.5.24.148
150	10.5.24.149/32	10.5.24.149 – 10.5.24.149	10.5.24.149
151	10.5.24.150/32	10.5.24.150 – 10.5.24.150	10.5.24.150
152	10.5.24.151/32	10.5.24.151 – 10.5.24.151	10.5.24.151
153	10.5.24.152/32	10.5.24.152 – 10.5.24.152	10.5.24.152
154	10.5.24.153/32	10.5.24.153 – 10.5.24.153	10.5.24.153
155	10.5.24.154/32	10.5.24.154 – 10.5.24.154	10.5.24.154
156	10.5.24.155/32	10.5.24.155 – 10.5.24.155	10.5.24.155
157	10.5.24.156/32	10.5.24.156 – 10.5.24.156	10.5.24.156
158	10.5.24.157/32	10.5.24.157 – 10.5.24.157	10.5.24.157
159	10.5.24.158/32	10.5.24.158 – 10.5.24.158	10.5.24.158
160	10.5.24.159/32	10.5.24.159 – 10.5.24.159	10.5.24.159
161	10.5.24.160/32	10.5.24.160 – 10.5.24.160	10.5.24.160
162	10.5.24.161/32	10.5.24.161 – 10.5.24.161	10.5.24.161
163	10.5.24.162/32	10.5.24.162 – 10.5.24.162	10.5.24.162
164	10.5.24.163/32	10.5.24.163 – 10.5.24.163	10.5.24.163
165	10.5.24.164/32	10.5.24.164 – 10.5.24.164	10.5.24.164
166	10.5.24.165/32	10.5.24.165 – 10.5.24.165	10.5.24.165
167	10.5.24.166/32	10.5.24.166 – 10.5.24.166	10.5.24.166
168	10.5.24.167/32	10.5.24.167 – 10.5.24.167	10.5.24.167
169	10.5.24.168/32	10.5.24.168 – 10.5.24.168	10.5.24.168
170	10.5.24.169/32	10.5.24.169 – 10.5.24.169	10.5.24.169
171	10.5.24.170/32	10.5.24.170 – 10.5.24.170	10.5.24.170
172	10.5.24.171/32	10.5.24.171 – 10.5.24.171	10.5.24.171
173	10.5.24.172/32	10.5.24.172 – 10.5.24.172	10.5.24.172
174	10.5.24.173/32	10.5.24.173 – 10.5.24.173	10.5.24.173
175	10.5.24.174/32	10.5.24.174 – 10.5.24.174	10.5.24.174
176	10.5.24.175/32	10.5.24.175 – 10.5.24.175	10.5.24.175
177	10.5.24.176/32	10.5.24.176 – 10.5.24.176	10.5.24.176
178	10.5.24.177/32	10.5.24.177 – 10.5.24.177	10.5.24.177
179	10.5.24.178/32	10.5.24.178 – 10.5.24.178	10.5.24.178
180	10.5.24.179/32	10.5.24.179 – 10.5.24.179	10.5.24.179
181	10.5.24.180/32	10.5.24.180 – 10.5.24.180	10.5.24.180
182	10.5.24.181/32	10.5.24.181 – 10.5.24.181	10.5.24.181
183	10.5.24.182/32	10.5.24.182 – 10.5.24.182	10.5.24.182
184	10.5.24.183/32	10.5.24.183 – 10.5.24.183	10.5.24.183
185	10.5.24.184/32	10.5.24.184 – 10.5.24.184	10.5.24.184
186	10.5.24.185/32	10.5.24.185 – 10.5.24.185	10.5.24.185
187	10.5.24.186/32	10.5.24.186 – 10.5.24.186	10.5.24.186
188	10.5.24.187/32	10.5.24.187 – 10.5.24.187	10.5.24.187
189	10.5.24.188/32	10.5.24.188 – 10.5.24.188	10.5.24.188
190	10.5.24.189/32	10.5.24.189 – 10.5.24.189	10.5.24.189
191	10.5.24.190/32	10.5.24.190 – 10.5.24.190	10.5.24.190
192	10.5.24.191/32	10.5.24.191 – 10.5.24.191	10.5.24.191
193	10.5.24.192/32	10.5.24.192 – 10.5.24.192	10.5.24.192
194	10.5.24.193/32	10.5.24.193 – 10.5.24.193	10.5.24.193
195	10.5.24.194/32	10.5.24.194 – 10.5.24.194	10.5.24.194
196	10.5.24.195/32	10.5.24.195 – 10.5.24.195	10.5.24.195
197	10.5.24.196/32	10.5.24.196 – 10.5.24.196	10.5.24.196
198	10.5.24.197/32	10.5.24.197 – 10.5.24.197	10.5.24.197
199	10.5.24.198/32	10.5.24.198 – 10.5.24.198	10.5.24.198
200	10.5.24.199/32	10.5.24.199 – 10.5.24.199	10.5.24.199
201	10.5.24.200/32	10.5.24.200 – 10.5.24.200	10.5.24.200
202	10.5.24.201/32	10.5.24.201 – 10.5.24.201	10.5.24.201
203	10.5.24.202/32	10.5.24.202 – 10.5.24.202	10.5.24.202
204	10.5.24.203/32	10.5.24.203 – 10.5.24.203	10.5.24.203
205	10.5.24.204/32	10.5.24.204 – 10.5.24.204	10.5.24.204
206	10.5.24.205/32	10.5.24.205 – 10.5.24.205	10.5.24.205
207	10.5.24.206/32	10.5.24.206 – 10.5.24.206	10.5.24.206
208	10.5.24.207/32	10.5.24.207 – 10.5.24.207	10.5.24.207
209	10.5.24.208/32	10.5.24.208 – 10.5.24.208	10.5.24.208
210	10.5.24.209/32	10.5.24.209 – 10.5.24.209	10.5.24.209
211	10.5.24.210/32	10.5.24.210 – 10.5.24.210	10.5.24.210
212	10.5.24.211/32	10.5.24.211 – 10.5.24.211	10.5.24.211
213	10.5.24.212/32	10.5.24.212 – 10.5.24.212	10.5.24.212
214	10.5.24.213/32	10.5.24.213 – 10.5.24.213	10.5.24.213
215	10.5.24.214/32	10.5.24.214 – 10.5.24.214	10.5.24.214
216	10.5.24.215/32	10.5.24.215 – 10.5.24.215	10.5.24.215
217	10.5.24.216/32	10.5.24.216 – 10.5.24.216	10.5.24.216
218	10.5.24.217/32	10.5.24.217 – 10.5.24.217	10.5.24.217
219	10.5.24.218/32	10.5.24.218 – 10.5.24.218	10.5.24.218
220	10.5.24.219/32	10.5.24.219 – 10.5.24.219	10.5.24.219
221	10.5.24.220/32	10.5.24.220 – 10.5.24.220	10.5.24.220
222	10.5.24.221/32	10.5.24.221 – 10.5.24.221	10.5.24.221
223	10.5.24.222/32	10.5.24.222 – 10.5.24.222	10.5.24.222
224	10.5.24.223/32	10.5.24.223 – 10.5.24.223	10.5.24.223
225	10.5.24.224/32	10.5.24.224 – 10.5.24.224	10.5.24.224
226	10.5.24.225/32	10.5.24.225 – 10.5.24.225	10.5.24.225
227	10.5.24.226/32	10.5.24.226 – 10.5.24.226	10.5.24.226
228	10.5.24.227/32	10.5.24.227 – 10.5.24.227	10.5.24.227
229	10.5.24.228/32	10.5.24.228 – 10.5.24.228	10.5.24.228
230	10.5.24.229/32	10.5.24.229 – 10.5.24.229	10.5.24.229
231	10.5.24.230/32	10.5.24.230 – 10.5.24.230	10.5.24.230
232	10.5.24.231/32	10.5.24.231 – 10.5.24.231	10.5.24.231
233	10.5.24.232/32	10.5.24.232 – 10.5.24.232	10.5.24.232
234	10.5.24.233/32	10.5.24.233 – 10.5.24.233	10.5.24.233
235	10.5.24.234/32	10.5.24.234 – 10.5.24.234	10.5.24.234
236	10.5.24.235/32	10.5.24.235 – 10.5.24.235	10.5.24.235
237	10.5.24.236/32	10.5.24.236 – 10.5.24.236	10.5.24.236
238	10.5.24.237/32	10.5.24.237 – 10.5.24.237	10.5.24.237
239	10.5.24.238/32	10.5.24.238 – 10.5.24.238	10.5.24.238
240	10.5.24.239/32	10.5.24.239 – 10.5.24.239	10.5.24.239
241	10.5.24.240/32	10.5.24.240 – 10.5.24.240	10.5.24.240
242	10.5.24.241/32	10.5.24.241 – 10.5.24.241	10.5.24.241
243	10.5.24.242/32	10.5.24.242 – 10.5.24.242	10.5.24.242
244	10.5.24.243/32	10.5.24.243 – 10.5.24.243	10.5.24.243
245	10.5.24.244/32	10.5.24.244 – 10.5.24.244	10.5.24.244
246	10.5.24.245/32	10.5.24.245 – 10.5.24.245	10.5.24.245
247	10.5.24.246/32	10.5.24.246 – 10.5.24.246	10.5.24.246
248	10.5.24.247/32	10.5.24.247 – 10.5.24.247	10.5.24.247
249	10.5.24.248/32	10.5.24.248 – 10.5.24.248	10.5.24.248
250	10.5.24.249/32	10.5.24.249 – 10.5.24.249	10.5.24.249
251	10.5.24.250/32	10.5.24.250 – 10.5.24.250	10.5.24.250
252	10.5.24.251/32	10.5.24.251 – 10.5.24.251	10.5.24.251
253	10.5.24.252/32	10.5.24.252 – 10.5.24.252	10.5.24.252
254	10.5.24.253/32	10.5.24.253 – 10.5.24.253	10.5.24.253
255	10.5.24.254/32	10.5.24.254 – 10.5.24.254	10.5.24.254
256	10.5.24.255/32	10.5.24.255 – 10.5.24.255	10.5.24.255

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 →