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)10.7.128.0/21

network10.7.128.0/21

broadcast10.7.135.255

first host10.7.128.1

last host10.7.135.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.7.128.0/21

address00001010.00000111.10000000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000111.10000000.00000000

broadcast00001010.00000111.10000111.11111111

green = network part, grey = host part

hex0x0a078000

decimal168263680

reverse dns0.128.7.10.in-addr.arpa

ipv4-mapped::ffff:a07:8000

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.7.128.0/32	10.7.128.0 – 10.7.128.0	10.7.128.0
2	10.7.128.1/32	10.7.128.1 – 10.7.128.1	10.7.128.1
3	10.7.128.2/32	10.7.128.2 – 10.7.128.2	10.7.128.2
4	10.7.128.3/32	10.7.128.3 – 10.7.128.3	10.7.128.3
5	10.7.128.4/32	10.7.128.4 – 10.7.128.4	10.7.128.4
6	10.7.128.5/32	10.7.128.5 – 10.7.128.5	10.7.128.5
7	10.7.128.6/32	10.7.128.6 – 10.7.128.6	10.7.128.6
8	10.7.128.7/32	10.7.128.7 – 10.7.128.7	10.7.128.7
9	10.7.128.8/32	10.7.128.8 – 10.7.128.8	10.7.128.8
10	10.7.128.9/32	10.7.128.9 – 10.7.128.9	10.7.128.9
11	10.7.128.10/32	10.7.128.10 – 10.7.128.10	10.7.128.10
12	10.7.128.11/32	10.7.128.11 – 10.7.128.11	10.7.128.11
13	10.7.128.12/32	10.7.128.12 – 10.7.128.12	10.7.128.12
14	10.7.128.13/32	10.7.128.13 – 10.7.128.13	10.7.128.13
15	10.7.128.14/32	10.7.128.14 – 10.7.128.14	10.7.128.14
16	10.7.128.15/32	10.7.128.15 – 10.7.128.15	10.7.128.15
17	10.7.128.16/32	10.7.128.16 – 10.7.128.16	10.7.128.16
18	10.7.128.17/32	10.7.128.17 – 10.7.128.17	10.7.128.17
19	10.7.128.18/32	10.7.128.18 – 10.7.128.18	10.7.128.18
20	10.7.128.19/32	10.7.128.19 – 10.7.128.19	10.7.128.19
21	10.7.128.20/32	10.7.128.20 – 10.7.128.20	10.7.128.20
22	10.7.128.21/32	10.7.128.21 – 10.7.128.21	10.7.128.21
23	10.7.128.22/32	10.7.128.22 – 10.7.128.22	10.7.128.22
24	10.7.128.23/32	10.7.128.23 – 10.7.128.23	10.7.128.23
25	10.7.128.24/32	10.7.128.24 – 10.7.128.24	10.7.128.24
26	10.7.128.25/32	10.7.128.25 – 10.7.128.25	10.7.128.25
27	10.7.128.26/32	10.7.128.26 – 10.7.128.26	10.7.128.26
28	10.7.128.27/32	10.7.128.27 – 10.7.128.27	10.7.128.27
29	10.7.128.28/32	10.7.128.28 – 10.7.128.28	10.7.128.28
30	10.7.128.29/32	10.7.128.29 – 10.7.128.29	10.7.128.29
31	10.7.128.30/32	10.7.128.30 – 10.7.128.30	10.7.128.30
32	10.7.128.31/32	10.7.128.31 – 10.7.128.31	10.7.128.31
33	10.7.128.32/32	10.7.128.32 – 10.7.128.32	10.7.128.32
34	10.7.128.33/32	10.7.128.33 – 10.7.128.33	10.7.128.33
35	10.7.128.34/32	10.7.128.34 – 10.7.128.34	10.7.128.34
36	10.7.128.35/32	10.7.128.35 – 10.7.128.35	10.7.128.35
37	10.7.128.36/32	10.7.128.36 – 10.7.128.36	10.7.128.36
38	10.7.128.37/32	10.7.128.37 – 10.7.128.37	10.7.128.37
39	10.7.128.38/32	10.7.128.38 – 10.7.128.38	10.7.128.38
40	10.7.128.39/32	10.7.128.39 – 10.7.128.39	10.7.128.39
41	10.7.128.40/32	10.7.128.40 – 10.7.128.40	10.7.128.40
42	10.7.128.41/32	10.7.128.41 – 10.7.128.41	10.7.128.41
43	10.7.128.42/32	10.7.128.42 – 10.7.128.42	10.7.128.42
44	10.7.128.43/32	10.7.128.43 – 10.7.128.43	10.7.128.43
45	10.7.128.44/32	10.7.128.44 – 10.7.128.44	10.7.128.44
46	10.7.128.45/32	10.7.128.45 – 10.7.128.45	10.7.128.45
47	10.7.128.46/32	10.7.128.46 – 10.7.128.46	10.7.128.46
48	10.7.128.47/32	10.7.128.47 – 10.7.128.47	10.7.128.47
49	10.7.128.48/32	10.7.128.48 – 10.7.128.48	10.7.128.48
50	10.7.128.49/32	10.7.128.49 – 10.7.128.49	10.7.128.49
51	10.7.128.50/32	10.7.128.50 – 10.7.128.50	10.7.128.50
52	10.7.128.51/32	10.7.128.51 – 10.7.128.51	10.7.128.51
53	10.7.128.52/32	10.7.128.52 – 10.7.128.52	10.7.128.52
54	10.7.128.53/32	10.7.128.53 – 10.7.128.53	10.7.128.53
55	10.7.128.54/32	10.7.128.54 – 10.7.128.54	10.7.128.54
56	10.7.128.55/32	10.7.128.55 – 10.7.128.55	10.7.128.55
57	10.7.128.56/32	10.7.128.56 – 10.7.128.56	10.7.128.56
58	10.7.128.57/32	10.7.128.57 – 10.7.128.57	10.7.128.57
59	10.7.128.58/32	10.7.128.58 – 10.7.128.58	10.7.128.58
60	10.7.128.59/32	10.7.128.59 – 10.7.128.59	10.7.128.59
61	10.7.128.60/32	10.7.128.60 – 10.7.128.60	10.7.128.60
62	10.7.128.61/32	10.7.128.61 – 10.7.128.61	10.7.128.61
63	10.7.128.62/32	10.7.128.62 – 10.7.128.62	10.7.128.62
64	10.7.128.63/32	10.7.128.63 – 10.7.128.63	10.7.128.63
65	10.7.128.64/32	10.7.128.64 – 10.7.128.64	10.7.128.64
66	10.7.128.65/32	10.7.128.65 – 10.7.128.65	10.7.128.65
67	10.7.128.66/32	10.7.128.66 – 10.7.128.66	10.7.128.66
68	10.7.128.67/32	10.7.128.67 – 10.7.128.67	10.7.128.67
69	10.7.128.68/32	10.7.128.68 – 10.7.128.68	10.7.128.68
70	10.7.128.69/32	10.7.128.69 – 10.7.128.69	10.7.128.69
71	10.7.128.70/32	10.7.128.70 – 10.7.128.70	10.7.128.70
72	10.7.128.71/32	10.7.128.71 – 10.7.128.71	10.7.128.71
73	10.7.128.72/32	10.7.128.72 – 10.7.128.72	10.7.128.72
74	10.7.128.73/32	10.7.128.73 – 10.7.128.73	10.7.128.73
75	10.7.128.74/32	10.7.128.74 – 10.7.128.74	10.7.128.74
76	10.7.128.75/32	10.7.128.75 – 10.7.128.75	10.7.128.75
77	10.7.128.76/32	10.7.128.76 – 10.7.128.76	10.7.128.76
78	10.7.128.77/32	10.7.128.77 – 10.7.128.77	10.7.128.77
79	10.7.128.78/32	10.7.128.78 – 10.7.128.78	10.7.128.78
80	10.7.128.79/32	10.7.128.79 – 10.7.128.79	10.7.128.79
81	10.7.128.80/32	10.7.128.80 – 10.7.128.80	10.7.128.80
82	10.7.128.81/32	10.7.128.81 – 10.7.128.81	10.7.128.81
83	10.7.128.82/32	10.7.128.82 – 10.7.128.82	10.7.128.82
84	10.7.128.83/32	10.7.128.83 – 10.7.128.83	10.7.128.83
85	10.7.128.84/32	10.7.128.84 – 10.7.128.84	10.7.128.84
86	10.7.128.85/32	10.7.128.85 – 10.7.128.85	10.7.128.85
87	10.7.128.86/32	10.7.128.86 – 10.7.128.86	10.7.128.86
88	10.7.128.87/32	10.7.128.87 – 10.7.128.87	10.7.128.87
89	10.7.128.88/32	10.7.128.88 – 10.7.128.88	10.7.128.88
90	10.7.128.89/32	10.7.128.89 – 10.7.128.89	10.7.128.89
91	10.7.128.90/32	10.7.128.90 – 10.7.128.90	10.7.128.90
92	10.7.128.91/32	10.7.128.91 – 10.7.128.91	10.7.128.91
93	10.7.128.92/32	10.7.128.92 – 10.7.128.92	10.7.128.92
94	10.7.128.93/32	10.7.128.93 – 10.7.128.93	10.7.128.93
95	10.7.128.94/32	10.7.128.94 – 10.7.128.94	10.7.128.94
96	10.7.128.95/32	10.7.128.95 – 10.7.128.95	10.7.128.95
97	10.7.128.96/32	10.7.128.96 – 10.7.128.96	10.7.128.96
98	10.7.128.97/32	10.7.128.97 – 10.7.128.97	10.7.128.97
99	10.7.128.98/32	10.7.128.98 – 10.7.128.98	10.7.128.98
100	10.7.128.99/32	10.7.128.99 – 10.7.128.99	10.7.128.99
101	10.7.128.100/32	10.7.128.100 – 10.7.128.100	10.7.128.100
102	10.7.128.101/32	10.7.128.101 – 10.7.128.101	10.7.128.101
103	10.7.128.102/32	10.7.128.102 – 10.7.128.102	10.7.128.102
104	10.7.128.103/32	10.7.128.103 – 10.7.128.103	10.7.128.103
105	10.7.128.104/32	10.7.128.104 – 10.7.128.104	10.7.128.104
106	10.7.128.105/32	10.7.128.105 – 10.7.128.105	10.7.128.105
107	10.7.128.106/32	10.7.128.106 – 10.7.128.106	10.7.128.106
108	10.7.128.107/32	10.7.128.107 – 10.7.128.107	10.7.128.107
109	10.7.128.108/32	10.7.128.108 – 10.7.128.108	10.7.128.108
110	10.7.128.109/32	10.7.128.109 – 10.7.128.109	10.7.128.109
111	10.7.128.110/32	10.7.128.110 – 10.7.128.110	10.7.128.110
112	10.7.128.111/32	10.7.128.111 – 10.7.128.111	10.7.128.111
113	10.7.128.112/32	10.7.128.112 – 10.7.128.112	10.7.128.112
114	10.7.128.113/32	10.7.128.113 – 10.7.128.113	10.7.128.113
115	10.7.128.114/32	10.7.128.114 – 10.7.128.114	10.7.128.114
116	10.7.128.115/32	10.7.128.115 – 10.7.128.115	10.7.128.115
117	10.7.128.116/32	10.7.128.116 – 10.7.128.116	10.7.128.116
118	10.7.128.117/32	10.7.128.117 – 10.7.128.117	10.7.128.117
119	10.7.128.118/32	10.7.128.118 – 10.7.128.118	10.7.128.118
120	10.7.128.119/32	10.7.128.119 – 10.7.128.119	10.7.128.119
121	10.7.128.120/32	10.7.128.120 – 10.7.128.120	10.7.128.120
122	10.7.128.121/32	10.7.128.121 – 10.7.128.121	10.7.128.121
123	10.7.128.122/32	10.7.128.122 – 10.7.128.122	10.7.128.122
124	10.7.128.123/32	10.7.128.123 – 10.7.128.123	10.7.128.123
125	10.7.128.124/32	10.7.128.124 – 10.7.128.124	10.7.128.124
126	10.7.128.125/32	10.7.128.125 – 10.7.128.125	10.7.128.125
127	10.7.128.126/32	10.7.128.126 – 10.7.128.126	10.7.128.126
128	10.7.128.127/32	10.7.128.127 – 10.7.128.127	10.7.128.127
129	10.7.128.128/32	10.7.128.128 – 10.7.128.128	10.7.128.128
130	10.7.128.129/32	10.7.128.129 – 10.7.128.129	10.7.128.129
131	10.7.128.130/32	10.7.128.130 – 10.7.128.130	10.7.128.130
132	10.7.128.131/32	10.7.128.131 – 10.7.128.131	10.7.128.131
133	10.7.128.132/32	10.7.128.132 – 10.7.128.132	10.7.128.132
134	10.7.128.133/32	10.7.128.133 – 10.7.128.133	10.7.128.133
135	10.7.128.134/32	10.7.128.134 – 10.7.128.134	10.7.128.134
136	10.7.128.135/32	10.7.128.135 – 10.7.128.135	10.7.128.135
137	10.7.128.136/32	10.7.128.136 – 10.7.128.136	10.7.128.136
138	10.7.128.137/32	10.7.128.137 – 10.7.128.137	10.7.128.137
139	10.7.128.138/32	10.7.128.138 – 10.7.128.138	10.7.128.138
140	10.7.128.139/32	10.7.128.139 – 10.7.128.139	10.7.128.139
141	10.7.128.140/32	10.7.128.140 – 10.7.128.140	10.7.128.140
142	10.7.128.141/32	10.7.128.141 – 10.7.128.141	10.7.128.141
143	10.7.128.142/32	10.7.128.142 – 10.7.128.142	10.7.128.142
144	10.7.128.143/32	10.7.128.143 – 10.7.128.143	10.7.128.143
145	10.7.128.144/32	10.7.128.144 – 10.7.128.144	10.7.128.144
146	10.7.128.145/32	10.7.128.145 – 10.7.128.145	10.7.128.145
147	10.7.128.146/32	10.7.128.146 – 10.7.128.146	10.7.128.146
148	10.7.128.147/32	10.7.128.147 – 10.7.128.147	10.7.128.147
149	10.7.128.148/32	10.7.128.148 – 10.7.128.148	10.7.128.148
150	10.7.128.149/32	10.7.128.149 – 10.7.128.149	10.7.128.149
151	10.7.128.150/32	10.7.128.150 – 10.7.128.150	10.7.128.150
152	10.7.128.151/32	10.7.128.151 – 10.7.128.151	10.7.128.151
153	10.7.128.152/32	10.7.128.152 – 10.7.128.152	10.7.128.152
154	10.7.128.153/32	10.7.128.153 – 10.7.128.153	10.7.128.153
155	10.7.128.154/32	10.7.128.154 – 10.7.128.154	10.7.128.154
156	10.7.128.155/32	10.7.128.155 – 10.7.128.155	10.7.128.155
157	10.7.128.156/32	10.7.128.156 – 10.7.128.156	10.7.128.156
158	10.7.128.157/32	10.7.128.157 – 10.7.128.157	10.7.128.157
159	10.7.128.158/32	10.7.128.158 – 10.7.128.158	10.7.128.158
160	10.7.128.159/32	10.7.128.159 – 10.7.128.159	10.7.128.159
161	10.7.128.160/32	10.7.128.160 – 10.7.128.160	10.7.128.160
162	10.7.128.161/32	10.7.128.161 – 10.7.128.161	10.7.128.161
163	10.7.128.162/32	10.7.128.162 – 10.7.128.162	10.7.128.162
164	10.7.128.163/32	10.7.128.163 – 10.7.128.163	10.7.128.163
165	10.7.128.164/32	10.7.128.164 – 10.7.128.164	10.7.128.164
166	10.7.128.165/32	10.7.128.165 – 10.7.128.165	10.7.128.165
167	10.7.128.166/32	10.7.128.166 – 10.7.128.166	10.7.128.166
168	10.7.128.167/32	10.7.128.167 – 10.7.128.167	10.7.128.167
169	10.7.128.168/32	10.7.128.168 – 10.7.128.168	10.7.128.168
170	10.7.128.169/32	10.7.128.169 – 10.7.128.169	10.7.128.169
171	10.7.128.170/32	10.7.128.170 – 10.7.128.170	10.7.128.170
172	10.7.128.171/32	10.7.128.171 – 10.7.128.171	10.7.128.171
173	10.7.128.172/32	10.7.128.172 – 10.7.128.172	10.7.128.172
174	10.7.128.173/32	10.7.128.173 – 10.7.128.173	10.7.128.173
175	10.7.128.174/32	10.7.128.174 – 10.7.128.174	10.7.128.174
176	10.7.128.175/32	10.7.128.175 – 10.7.128.175	10.7.128.175
177	10.7.128.176/32	10.7.128.176 – 10.7.128.176	10.7.128.176
178	10.7.128.177/32	10.7.128.177 – 10.7.128.177	10.7.128.177
179	10.7.128.178/32	10.7.128.178 – 10.7.128.178	10.7.128.178
180	10.7.128.179/32	10.7.128.179 – 10.7.128.179	10.7.128.179
181	10.7.128.180/32	10.7.128.180 – 10.7.128.180	10.7.128.180
182	10.7.128.181/32	10.7.128.181 – 10.7.128.181	10.7.128.181
183	10.7.128.182/32	10.7.128.182 – 10.7.128.182	10.7.128.182
184	10.7.128.183/32	10.7.128.183 – 10.7.128.183	10.7.128.183
185	10.7.128.184/32	10.7.128.184 – 10.7.128.184	10.7.128.184
186	10.7.128.185/32	10.7.128.185 – 10.7.128.185	10.7.128.185
187	10.7.128.186/32	10.7.128.186 – 10.7.128.186	10.7.128.186
188	10.7.128.187/32	10.7.128.187 – 10.7.128.187	10.7.128.187
189	10.7.128.188/32	10.7.128.188 – 10.7.128.188	10.7.128.188
190	10.7.128.189/32	10.7.128.189 – 10.7.128.189	10.7.128.189
191	10.7.128.190/32	10.7.128.190 – 10.7.128.190	10.7.128.190
192	10.7.128.191/32	10.7.128.191 – 10.7.128.191	10.7.128.191
193	10.7.128.192/32	10.7.128.192 – 10.7.128.192	10.7.128.192
194	10.7.128.193/32	10.7.128.193 – 10.7.128.193	10.7.128.193
195	10.7.128.194/32	10.7.128.194 – 10.7.128.194	10.7.128.194
196	10.7.128.195/32	10.7.128.195 – 10.7.128.195	10.7.128.195
197	10.7.128.196/32	10.7.128.196 – 10.7.128.196	10.7.128.196
198	10.7.128.197/32	10.7.128.197 – 10.7.128.197	10.7.128.197
199	10.7.128.198/32	10.7.128.198 – 10.7.128.198	10.7.128.198
200	10.7.128.199/32	10.7.128.199 – 10.7.128.199	10.7.128.199
201	10.7.128.200/32	10.7.128.200 – 10.7.128.200	10.7.128.200
202	10.7.128.201/32	10.7.128.201 – 10.7.128.201	10.7.128.201
203	10.7.128.202/32	10.7.128.202 – 10.7.128.202	10.7.128.202
204	10.7.128.203/32	10.7.128.203 – 10.7.128.203	10.7.128.203
205	10.7.128.204/32	10.7.128.204 – 10.7.128.204	10.7.128.204
206	10.7.128.205/32	10.7.128.205 – 10.7.128.205	10.7.128.205
207	10.7.128.206/32	10.7.128.206 – 10.7.128.206	10.7.128.206
208	10.7.128.207/32	10.7.128.207 – 10.7.128.207	10.7.128.207
209	10.7.128.208/32	10.7.128.208 – 10.7.128.208	10.7.128.208
210	10.7.128.209/32	10.7.128.209 – 10.7.128.209	10.7.128.209
211	10.7.128.210/32	10.7.128.210 – 10.7.128.210	10.7.128.210
212	10.7.128.211/32	10.7.128.211 – 10.7.128.211	10.7.128.211
213	10.7.128.212/32	10.7.128.212 – 10.7.128.212	10.7.128.212
214	10.7.128.213/32	10.7.128.213 – 10.7.128.213	10.7.128.213
215	10.7.128.214/32	10.7.128.214 – 10.7.128.214	10.7.128.214
216	10.7.128.215/32	10.7.128.215 – 10.7.128.215	10.7.128.215
217	10.7.128.216/32	10.7.128.216 – 10.7.128.216	10.7.128.216
218	10.7.128.217/32	10.7.128.217 – 10.7.128.217	10.7.128.217
219	10.7.128.218/32	10.7.128.218 – 10.7.128.218	10.7.128.218
220	10.7.128.219/32	10.7.128.219 – 10.7.128.219	10.7.128.219
221	10.7.128.220/32	10.7.128.220 – 10.7.128.220	10.7.128.220
222	10.7.128.221/32	10.7.128.221 – 10.7.128.221	10.7.128.221
223	10.7.128.222/32	10.7.128.222 – 10.7.128.222	10.7.128.222
224	10.7.128.223/32	10.7.128.223 – 10.7.128.223	10.7.128.223
225	10.7.128.224/32	10.7.128.224 – 10.7.128.224	10.7.128.224
226	10.7.128.225/32	10.7.128.225 – 10.7.128.225	10.7.128.225
227	10.7.128.226/32	10.7.128.226 – 10.7.128.226	10.7.128.226
228	10.7.128.227/32	10.7.128.227 – 10.7.128.227	10.7.128.227
229	10.7.128.228/32	10.7.128.228 – 10.7.128.228	10.7.128.228
230	10.7.128.229/32	10.7.128.229 – 10.7.128.229	10.7.128.229
231	10.7.128.230/32	10.7.128.230 – 10.7.128.230	10.7.128.230
232	10.7.128.231/32	10.7.128.231 – 10.7.128.231	10.7.128.231
233	10.7.128.232/32	10.7.128.232 – 10.7.128.232	10.7.128.232
234	10.7.128.233/32	10.7.128.233 – 10.7.128.233	10.7.128.233
235	10.7.128.234/32	10.7.128.234 – 10.7.128.234	10.7.128.234
236	10.7.128.235/32	10.7.128.235 – 10.7.128.235	10.7.128.235
237	10.7.128.236/32	10.7.128.236 – 10.7.128.236	10.7.128.236
238	10.7.128.237/32	10.7.128.237 – 10.7.128.237	10.7.128.237
239	10.7.128.238/32	10.7.128.238 – 10.7.128.238	10.7.128.238
240	10.7.128.239/32	10.7.128.239 – 10.7.128.239	10.7.128.239
241	10.7.128.240/32	10.7.128.240 – 10.7.128.240	10.7.128.240
242	10.7.128.241/32	10.7.128.241 – 10.7.128.241	10.7.128.241
243	10.7.128.242/32	10.7.128.242 – 10.7.128.242	10.7.128.242
244	10.7.128.243/32	10.7.128.243 – 10.7.128.243	10.7.128.243
245	10.7.128.244/32	10.7.128.244 – 10.7.128.244	10.7.128.244
246	10.7.128.245/32	10.7.128.245 – 10.7.128.245	10.7.128.245
247	10.7.128.246/32	10.7.128.246 – 10.7.128.246	10.7.128.246
248	10.7.128.247/32	10.7.128.247 – 10.7.128.247	10.7.128.247
249	10.7.128.248/32	10.7.128.248 – 10.7.128.248	10.7.128.248
250	10.7.128.249/32	10.7.128.249 – 10.7.128.249	10.7.128.249
251	10.7.128.250/32	10.7.128.250 – 10.7.128.250	10.7.128.250
252	10.7.128.251/32	10.7.128.251 – 10.7.128.251	10.7.128.251
253	10.7.128.252/32	10.7.128.252 – 10.7.128.252	10.7.128.252
254	10.7.128.253/32	10.7.128.253 – 10.7.128.253	10.7.128.253
255	10.7.128.254/32	10.7.128.254 – 10.7.128.254	10.7.128.254
256	10.7.128.255/32	10.7.128.255 – 10.7.128.255	10.7.128.255

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 →