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)10.3.80.0/20

network10.3.80.0/20

broadcast10.3.95.255

first host10.3.80.1

last host10.3.95.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.3.80.0/20

address00001010.00000011.01010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000011.01010000.00000000

broadcast00001010.00000011.01011111.11111111

green = network part, grey = host part

hex0x0a035000

decimal167989248

reverse dns0.80.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:5000

/20 split into /32 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.3.80.0/32	10.3.80.0 – 10.3.80.0	10.3.80.0
2	10.3.80.1/32	10.3.80.1 – 10.3.80.1	10.3.80.1
3	10.3.80.2/32	10.3.80.2 – 10.3.80.2	10.3.80.2
4	10.3.80.3/32	10.3.80.3 – 10.3.80.3	10.3.80.3
5	10.3.80.4/32	10.3.80.4 – 10.3.80.4	10.3.80.4
6	10.3.80.5/32	10.3.80.5 – 10.3.80.5	10.3.80.5
7	10.3.80.6/32	10.3.80.6 – 10.3.80.6	10.3.80.6
8	10.3.80.7/32	10.3.80.7 – 10.3.80.7	10.3.80.7
9	10.3.80.8/32	10.3.80.8 – 10.3.80.8	10.3.80.8
10	10.3.80.9/32	10.3.80.9 – 10.3.80.9	10.3.80.9
11	10.3.80.10/32	10.3.80.10 – 10.3.80.10	10.3.80.10
12	10.3.80.11/32	10.3.80.11 – 10.3.80.11	10.3.80.11
13	10.3.80.12/32	10.3.80.12 – 10.3.80.12	10.3.80.12
14	10.3.80.13/32	10.3.80.13 – 10.3.80.13	10.3.80.13
15	10.3.80.14/32	10.3.80.14 – 10.3.80.14	10.3.80.14
16	10.3.80.15/32	10.3.80.15 – 10.3.80.15	10.3.80.15
17	10.3.80.16/32	10.3.80.16 – 10.3.80.16	10.3.80.16
18	10.3.80.17/32	10.3.80.17 – 10.3.80.17	10.3.80.17
19	10.3.80.18/32	10.3.80.18 – 10.3.80.18	10.3.80.18
20	10.3.80.19/32	10.3.80.19 – 10.3.80.19	10.3.80.19
21	10.3.80.20/32	10.3.80.20 – 10.3.80.20	10.3.80.20
22	10.3.80.21/32	10.3.80.21 – 10.3.80.21	10.3.80.21
23	10.3.80.22/32	10.3.80.22 – 10.3.80.22	10.3.80.22
24	10.3.80.23/32	10.3.80.23 – 10.3.80.23	10.3.80.23
25	10.3.80.24/32	10.3.80.24 – 10.3.80.24	10.3.80.24
26	10.3.80.25/32	10.3.80.25 – 10.3.80.25	10.3.80.25
27	10.3.80.26/32	10.3.80.26 – 10.3.80.26	10.3.80.26
28	10.3.80.27/32	10.3.80.27 – 10.3.80.27	10.3.80.27
29	10.3.80.28/32	10.3.80.28 – 10.3.80.28	10.3.80.28
30	10.3.80.29/32	10.3.80.29 – 10.3.80.29	10.3.80.29
31	10.3.80.30/32	10.3.80.30 – 10.3.80.30	10.3.80.30
32	10.3.80.31/32	10.3.80.31 – 10.3.80.31	10.3.80.31
33	10.3.80.32/32	10.3.80.32 – 10.3.80.32	10.3.80.32
34	10.3.80.33/32	10.3.80.33 – 10.3.80.33	10.3.80.33
35	10.3.80.34/32	10.3.80.34 – 10.3.80.34	10.3.80.34
36	10.3.80.35/32	10.3.80.35 – 10.3.80.35	10.3.80.35
37	10.3.80.36/32	10.3.80.36 – 10.3.80.36	10.3.80.36
38	10.3.80.37/32	10.3.80.37 – 10.3.80.37	10.3.80.37
39	10.3.80.38/32	10.3.80.38 – 10.3.80.38	10.3.80.38
40	10.3.80.39/32	10.3.80.39 – 10.3.80.39	10.3.80.39
41	10.3.80.40/32	10.3.80.40 – 10.3.80.40	10.3.80.40
42	10.3.80.41/32	10.3.80.41 – 10.3.80.41	10.3.80.41
43	10.3.80.42/32	10.3.80.42 – 10.3.80.42	10.3.80.42
44	10.3.80.43/32	10.3.80.43 – 10.3.80.43	10.3.80.43
45	10.3.80.44/32	10.3.80.44 – 10.3.80.44	10.3.80.44
46	10.3.80.45/32	10.3.80.45 – 10.3.80.45	10.3.80.45
47	10.3.80.46/32	10.3.80.46 – 10.3.80.46	10.3.80.46
48	10.3.80.47/32	10.3.80.47 – 10.3.80.47	10.3.80.47
49	10.3.80.48/32	10.3.80.48 – 10.3.80.48	10.3.80.48
50	10.3.80.49/32	10.3.80.49 – 10.3.80.49	10.3.80.49
51	10.3.80.50/32	10.3.80.50 – 10.3.80.50	10.3.80.50
52	10.3.80.51/32	10.3.80.51 – 10.3.80.51	10.3.80.51
53	10.3.80.52/32	10.3.80.52 – 10.3.80.52	10.3.80.52
54	10.3.80.53/32	10.3.80.53 – 10.3.80.53	10.3.80.53
55	10.3.80.54/32	10.3.80.54 – 10.3.80.54	10.3.80.54
56	10.3.80.55/32	10.3.80.55 – 10.3.80.55	10.3.80.55
57	10.3.80.56/32	10.3.80.56 – 10.3.80.56	10.3.80.56
58	10.3.80.57/32	10.3.80.57 – 10.3.80.57	10.3.80.57
59	10.3.80.58/32	10.3.80.58 – 10.3.80.58	10.3.80.58
60	10.3.80.59/32	10.3.80.59 – 10.3.80.59	10.3.80.59
61	10.3.80.60/32	10.3.80.60 – 10.3.80.60	10.3.80.60
62	10.3.80.61/32	10.3.80.61 – 10.3.80.61	10.3.80.61
63	10.3.80.62/32	10.3.80.62 – 10.3.80.62	10.3.80.62
64	10.3.80.63/32	10.3.80.63 – 10.3.80.63	10.3.80.63
65	10.3.80.64/32	10.3.80.64 – 10.3.80.64	10.3.80.64
66	10.3.80.65/32	10.3.80.65 – 10.3.80.65	10.3.80.65
67	10.3.80.66/32	10.3.80.66 – 10.3.80.66	10.3.80.66
68	10.3.80.67/32	10.3.80.67 – 10.3.80.67	10.3.80.67
69	10.3.80.68/32	10.3.80.68 – 10.3.80.68	10.3.80.68
70	10.3.80.69/32	10.3.80.69 – 10.3.80.69	10.3.80.69
71	10.3.80.70/32	10.3.80.70 – 10.3.80.70	10.3.80.70
72	10.3.80.71/32	10.3.80.71 – 10.3.80.71	10.3.80.71
73	10.3.80.72/32	10.3.80.72 – 10.3.80.72	10.3.80.72
74	10.3.80.73/32	10.3.80.73 – 10.3.80.73	10.3.80.73
75	10.3.80.74/32	10.3.80.74 – 10.3.80.74	10.3.80.74
76	10.3.80.75/32	10.3.80.75 – 10.3.80.75	10.3.80.75
77	10.3.80.76/32	10.3.80.76 – 10.3.80.76	10.3.80.76
78	10.3.80.77/32	10.3.80.77 – 10.3.80.77	10.3.80.77
79	10.3.80.78/32	10.3.80.78 – 10.3.80.78	10.3.80.78
80	10.3.80.79/32	10.3.80.79 – 10.3.80.79	10.3.80.79
81	10.3.80.80/32	10.3.80.80 – 10.3.80.80	10.3.80.80
82	10.3.80.81/32	10.3.80.81 – 10.3.80.81	10.3.80.81
83	10.3.80.82/32	10.3.80.82 – 10.3.80.82	10.3.80.82
84	10.3.80.83/32	10.3.80.83 – 10.3.80.83	10.3.80.83
85	10.3.80.84/32	10.3.80.84 – 10.3.80.84	10.3.80.84
86	10.3.80.85/32	10.3.80.85 – 10.3.80.85	10.3.80.85
87	10.3.80.86/32	10.3.80.86 – 10.3.80.86	10.3.80.86
88	10.3.80.87/32	10.3.80.87 – 10.3.80.87	10.3.80.87
89	10.3.80.88/32	10.3.80.88 – 10.3.80.88	10.3.80.88
90	10.3.80.89/32	10.3.80.89 – 10.3.80.89	10.3.80.89
91	10.3.80.90/32	10.3.80.90 – 10.3.80.90	10.3.80.90
92	10.3.80.91/32	10.3.80.91 – 10.3.80.91	10.3.80.91
93	10.3.80.92/32	10.3.80.92 – 10.3.80.92	10.3.80.92
94	10.3.80.93/32	10.3.80.93 – 10.3.80.93	10.3.80.93
95	10.3.80.94/32	10.3.80.94 – 10.3.80.94	10.3.80.94
96	10.3.80.95/32	10.3.80.95 – 10.3.80.95	10.3.80.95
97	10.3.80.96/32	10.3.80.96 – 10.3.80.96	10.3.80.96
98	10.3.80.97/32	10.3.80.97 – 10.3.80.97	10.3.80.97
99	10.3.80.98/32	10.3.80.98 – 10.3.80.98	10.3.80.98
100	10.3.80.99/32	10.3.80.99 – 10.3.80.99	10.3.80.99
101	10.3.80.100/32	10.3.80.100 – 10.3.80.100	10.3.80.100
102	10.3.80.101/32	10.3.80.101 – 10.3.80.101	10.3.80.101
103	10.3.80.102/32	10.3.80.102 – 10.3.80.102	10.3.80.102
104	10.3.80.103/32	10.3.80.103 – 10.3.80.103	10.3.80.103
105	10.3.80.104/32	10.3.80.104 – 10.3.80.104	10.3.80.104
106	10.3.80.105/32	10.3.80.105 – 10.3.80.105	10.3.80.105
107	10.3.80.106/32	10.3.80.106 – 10.3.80.106	10.3.80.106
108	10.3.80.107/32	10.3.80.107 – 10.3.80.107	10.3.80.107
109	10.3.80.108/32	10.3.80.108 – 10.3.80.108	10.3.80.108
110	10.3.80.109/32	10.3.80.109 – 10.3.80.109	10.3.80.109
111	10.3.80.110/32	10.3.80.110 – 10.3.80.110	10.3.80.110
112	10.3.80.111/32	10.3.80.111 – 10.3.80.111	10.3.80.111
113	10.3.80.112/32	10.3.80.112 – 10.3.80.112	10.3.80.112
114	10.3.80.113/32	10.3.80.113 – 10.3.80.113	10.3.80.113
115	10.3.80.114/32	10.3.80.114 – 10.3.80.114	10.3.80.114
116	10.3.80.115/32	10.3.80.115 – 10.3.80.115	10.3.80.115
117	10.3.80.116/32	10.3.80.116 – 10.3.80.116	10.3.80.116
118	10.3.80.117/32	10.3.80.117 – 10.3.80.117	10.3.80.117
119	10.3.80.118/32	10.3.80.118 – 10.3.80.118	10.3.80.118
120	10.3.80.119/32	10.3.80.119 – 10.3.80.119	10.3.80.119
121	10.3.80.120/32	10.3.80.120 – 10.3.80.120	10.3.80.120
122	10.3.80.121/32	10.3.80.121 – 10.3.80.121	10.3.80.121
123	10.3.80.122/32	10.3.80.122 – 10.3.80.122	10.3.80.122
124	10.3.80.123/32	10.3.80.123 – 10.3.80.123	10.3.80.123
125	10.3.80.124/32	10.3.80.124 – 10.3.80.124	10.3.80.124
126	10.3.80.125/32	10.3.80.125 – 10.3.80.125	10.3.80.125
127	10.3.80.126/32	10.3.80.126 – 10.3.80.126	10.3.80.126
128	10.3.80.127/32	10.3.80.127 – 10.3.80.127	10.3.80.127
129	10.3.80.128/32	10.3.80.128 – 10.3.80.128	10.3.80.128
130	10.3.80.129/32	10.3.80.129 – 10.3.80.129	10.3.80.129
131	10.3.80.130/32	10.3.80.130 – 10.3.80.130	10.3.80.130
132	10.3.80.131/32	10.3.80.131 – 10.3.80.131	10.3.80.131
133	10.3.80.132/32	10.3.80.132 – 10.3.80.132	10.3.80.132
134	10.3.80.133/32	10.3.80.133 – 10.3.80.133	10.3.80.133
135	10.3.80.134/32	10.3.80.134 – 10.3.80.134	10.3.80.134
136	10.3.80.135/32	10.3.80.135 – 10.3.80.135	10.3.80.135
137	10.3.80.136/32	10.3.80.136 – 10.3.80.136	10.3.80.136
138	10.3.80.137/32	10.3.80.137 – 10.3.80.137	10.3.80.137
139	10.3.80.138/32	10.3.80.138 – 10.3.80.138	10.3.80.138
140	10.3.80.139/32	10.3.80.139 – 10.3.80.139	10.3.80.139
141	10.3.80.140/32	10.3.80.140 – 10.3.80.140	10.3.80.140
142	10.3.80.141/32	10.3.80.141 – 10.3.80.141	10.3.80.141
143	10.3.80.142/32	10.3.80.142 – 10.3.80.142	10.3.80.142
144	10.3.80.143/32	10.3.80.143 – 10.3.80.143	10.3.80.143
145	10.3.80.144/32	10.3.80.144 – 10.3.80.144	10.3.80.144
146	10.3.80.145/32	10.3.80.145 – 10.3.80.145	10.3.80.145
147	10.3.80.146/32	10.3.80.146 – 10.3.80.146	10.3.80.146
148	10.3.80.147/32	10.3.80.147 – 10.3.80.147	10.3.80.147
149	10.3.80.148/32	10.3.80.148 – 10.3.80.148	10.3.80.148
150	10.3.80.149/32	10.3.80.149 – 10.3.80.149	10.3.80.149
151	10.3.80.150/32	10.3.80.150 – 10.3.80.150	10.3.80.150
152	10.3.80.151/32	10.3.80.151 – 10.3.80.151	10.3.80.151
153	10.3.80.152/32	10.3.80.152 – 10.3.80.152	10.3.80.152
154	10.3.80.153/32	10.3.80.153 – 10.3.80.153	10.3.80.153
155	10.3.80.154/32	10.3.80.154 – 10.3.80.154	10.3.80.154
156	10.3.80.155/32	10.3.80.155 – 10.3.80.155	10.3.80.155
157	10.3.80.156/32	10.3.80.156 – 10.3.80.156	10.3.80.156
158	10.3.80.157/32	10.3.80.157 – 10.3.80.157	10.3.80.157
159	10.3.80.158/32	10.3.80.158 – 10.3.80.158	10.3.80.158
160	10.3.80.159/32	10.3.80.159 – 10.3.80.159	10.3.80.159
161	10.3.80.160/32	10.3.80.160 – 10.3.80.160	10.3.80.160
162	10.3.80.161/32	10.3.80.161 – 10.3.80.161	10.3.80.161
163	10.3.80.162/32	10.3.80.162 – 10.3.80.162	10.3.80.162
164	10.3.80.163/32	10.3.80.163 – 10.3.80.163	10.3.80.163
165	10.3.80.164/32	10.3.80.164 – 10.3.80.164	10.3.80.164
166	10.3.80.165/32	10.3.80.165 – 10.3.80.165	10.3.80.165
167	10.3.80.166/32	10.3.80.166 – 10.3.80.166	10.3.80.166
168	10.3.80.167/32	10.3.80.167 – 10.3.80.167	10.3.80.167
169	10.3.80.168/32	10.3.80.168 – 10.3.80.168	10.3.80.168
170	10.3.80.169/32	10.3.80.169 – 10.3.80.169	10.3.80.169
171	10.3.80.170/32	10.3.80.170 – 10.3.80.170	10.3.80.170
172	10.3.80.171/32	10.3.80.171 – 10.3.80.171	10.3.80.171
173	10.3.80.172/32	10.3.80.172 – 10.3.80.172	10.3.80.172
174	10.3.80.173/32	10.3.80.173 – 10.3.80.173	10.3.80.173
175	10.3.80.174/32	10.3.80.174 – 10.3.80.174	10.3.80.174
176	10.3.80.175/32	10.3.80.175 – 10.3.80.175	10.3.80.175
177	10.3.80.176/32	10.3.80.176 – 10.3.80.176	10.3.80.176
178	10.3.80.177/32	10.3.80.177 – 10.3.80.177	10.3.80.177
179	10.3.80.178/32	10.3.80.178 – 10.3.80.178	10.3.80.178
180	10.3.80.179/32	10.3.80.179 – 10.3.80.179	10.3.80.179
181	10.3.80.180/32	10.3.80.180 – 10.3.80.180	10.3.80.180
182	10.3.80.181/32	10.3.80.181 – 10.3.80.181	10.3.80.181
183	10.3.80.182/32	10.3.80.182 – 10.3.80.182	10.3.80.182
184	10.3.80.183/32	10.3.80.183 – 10.3.80.183	10.3.80.183
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186	10.3.80.185/32	10.3.80.185 – 10.3.80.185	10.3.80.185
187	10.3.80.186/32	10.3.80.186 – 10.3.80.186	10.3.80.186
188	10.3.80.187/32	10.3.80.187 – 10.3.80.187	10.3.80.187
189	10.3.80.188/32	10.3.80.188 – 10.3.80.188	10.3.80.188
190	10.3.80.189/32	10.3.80.189 – 10.3.80.189	10.3.80.189
191	10.3.80.190/32	10.3.80.190 – 10.3.80.190	10.3.80.190
192	10.3.80.191/32	10.3.80.191 – 10.3.80.191	10.3.80.191
193	10.3.80.192/32	10.3.80.192 – 10.3.80.192	10.3.80.192
194	10.3.80.193/32	10.3.80.193 – 10.3.80.193	10.3.80.193
195	10.3.80.194/32	10.3.80.194 – 10.3.80.194	10.3.80.194
196	10.3.80.195/32	10.3.80.195 – 10.3.80.195	10.3.80.195
197	10.3.80.196/32	10.3.80.196 – 10.3.80.196	10.3.80.196
198	10.3.80.197/32	10.3.80.197 – 10.3.80.197	10.3.80.197
199	10.3.80.198/32	10.3.80.198 – 10.3.80.198	10.3.80.198
200	10.3.80.199/32	10.3.80.199 – 10.3.80.199	10.3.80.199
201	10.3.80.200/32	10.3.80.200 – 10.3.80.200	10.3.80.200
202	10.3.80.201/32	10.3.80.201 – 10.3.80.201	10.3.80.201
203	10.3.80.202/32	10.3.80.202 – 10.3.80.202	10.3.80.202
204	10.3.80.203/32	10.3.80.203 – 10.3.80.203	10.3.80.203
205	10.3.80.204/32	10.3.80.204 – 10.3.80.204	10.3.80.204
206	10.3.80.205/32	10.3.80.205 – 10.3.80.205	10.3.80.205
207	10.3.80.206/32	10.3.80.206 – 10.3.80.206	10.3.80.206
208	10.3.80.207/32	10.3.80.207 – 10.3.80.207	10.3.80.207
209	10.3.80.208/32	10.3.80.208 – 10.3.80.208	10.3.80.208
210	10.3.80.209/32	10.3.80.209 – 10.3.80.209	10.3.80.209
211	10.3.80.210/32	10.3.80.210 – 10.3.80.210	10.3.80.210
212	10.3.80.211/32	10.3.80.211 – 10.3.80.211	10.3.80.211
213	10.3.80.212/32	10.3.80.212 – 10.3.80.212	10.3.80.212
214	10.3.80.213/32	10.3.80.213 – 10.3.80.213	10.3.80.213
215	10.3.80.214/32	10.3.80.214 – 10.3.80.214	10.3.80.214
216	10.3.80.215/32	10.3.80.215 – 10.3.80.215	10.3.80.215
217	10.3.80.216/32	10.3.80.216 – 10.3.80.216	10.3.80.216
218	10.3.80.217/32	10.3.80.217 – 10.3.80.217	10.3.80.217
219	10.3.80.218/32	10.3.80.218 – 10.3.80.218	10.3.80.218
220	10.3.80.219/32	10.3.80.219 – 10.3.80.219	10.3.80.219
221	10.3.80.220/32	10.3.80.220 – 10.3.80.220	10.3.80.220
222	10.3.80.221/32	10.3.80.221 – 10.3.80.221	10.3.80.221
223	10.3.80.222/32	10.3.80.222 – 10.3.80.222	10.3.80.222
224	10.3.80.223/32	10.3.80.223 – 10.3.80.223	10.3.80.223
225	10.3.80.224/32	10.3.80.224 – 10.3.80.224	10.3.80.224
226	10.3.80.225/32	10.3.80.225 – 10.3.80.225	10.3.80.225
227	10.3.80.226/32	10.3.80.226 – 10.3.80.226	10.3.80.226
228	10.3.80.227/32	10.3.80.227 – 10.3.80.227	10.3.80.227
229	10.3.80.228/32	10.3.80.228 – 10.3.80.228	10.3.80.228
230	10.3.80.229/32	10.3.80.229 – 10.3.80.229	10.3.80.229
231	10.3.80.230/32	10.3.80.230 – 10.3.80.230	10.3.80.230
232	10.3.80.231/32	10.3.80.231 – 10.3.80.231	10.3.80.231
233	10.3.80.232/32	10.3.80.232 – 10.3.80.232	10.3.80.232
234	10.3.80.233/32	10.3.80.233 – 10.3.80.233	10.3.80.233
235	10.3.80.234/32	10.3.80.234 – 10.3.80.234	10.3.80.234
236	10.3.80.235/32	10.3.80.235 – 10.3.80.235	10.3.80.235
237	10.3.80.236/32	10.3.80.236 – 10.3.80.236	10.3.80.236
238	10.3.80.237/32	10.3.80.237 – 10.3.80.237	10.3.80.237
239	10.3.80.238/32	10.3.80.238 – 10.3.80.238	10.3.80.238
240	10.3.80.239/32	10.3.80.239 – 10.3.80.239	10.3.80.239
241	10.3.80.240/32	10.3.80.240 – 10.3.80.240	10.3.80.240
242	10.3.80.241/32	10.3.80.241 – 10.3.80.241	10.3.80.241
243	10.3.80.242/32	10.3.80.242 – 10.3.80.242	10.3.80.242
244	10.3.80.243/32	10.3.80.243 – 10.3.80.243	10.3.80.243
245	10.3.80.244/32	10.3.80.244 – 10.3.80.244	10.3.80.244
246	10.3.80.245/32	10.3.80.245 – 10.3.80.245	10.3.80.245
247	10.3.80.246/32	10.3.80.246 – 10.3.80.246	10.3.80.246
248	10.3.80.247/32	10.3.80.247 – 10.3.80.247	10.3.80.247
249	10.3.80.248/32	10.3.80.248 – 10.3.80.248	10.3.80.248
250	10.3.80.249/32	10.3.80.249 – 10.3.80.249	10.3.80.249
251	10.3.80.250/32	10.3.80.250 – 10.3.80.250	10.3.80.250
252	10.3.80.251/32	10.3.80.251 – 10.3.80.251	10.3.80.251
253	10.3.80.252/32	10.3.80.252 – 10.3.80.252	10.3.80.252
254	10.3.80.253/32	10.3.80.253 – 10.3.80.253	10.3.80.253
255	10.3.80.254/32	10.3.80.254 – 10.3.80.254	10.3.80.254
256	10.3.80.255/32	10.3.80.255 – 10.3.80.255	10.3.80.255

showing 256 of 4,096

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 /20
/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	1
/21	255.255.248.0	2,048	2,046	2 split →
/22	255.255.252.0	1,024	1,022	4 split →
/23	255.255.254.0	512	510	8 split →
/24	255.255.255.0	256	254	16 split →
/25	255.255.255.128	128	126	32 split →
/26	255.255.255.192	64	62	64 split →
/27	255.255.255.224	32	30	128 split →
/28	255.255.255.240	16	14	256 split →
/29	255.255.255.248	8	6	512 split →
/30	255.255.255.252	4	2	1,024 split →
/31	255.255.255.254	2	2	2,048 split →
/32	255.255.255.255	1	1	4,096 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 →