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)10.3.32.0/20

network10.3.32.0/20

broadcast10.3.47.255

first host10.3.32.1

last host10.3.47.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.3.32.0/20

address00001010.00000011.00100000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000011.00100000.00000000

broadcast00001010.00000011.00101111.11111111

green = network part, grey = host part

hex0x0a032000

decimal167976960

reverse dns0.32.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2000

/20 split into /30 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.3.32.0/30	10.3.32.1 – 10.3.32.2	10.3.32.3
2	10.3.32.4/30	10.3.32.5 – 10.3.32.6	10.3.32.7
3	10.3.32.8/30	10.3.32.9 – 10.3.32.10	10.3.32.11
4	10.3.32.12/30	10.3.32.13 – 10.3.32.14	10.3.32.15
5	10.3.32.16/30	10.3.32.17 – 10.3.32.18	10.3.32.19
6	10.3.32.20/30	10.3.32.21 – 10.3.32.22	10.3.32.23
7	10.3.32.24/30	10.3.32.25 – 10.3.32.26	10.3.32.27
8	10.3.32.28/30	10.3.32.29 – 10.3.32.30	10.3.32.31
9	10.3.32.32/30	10.3.32.33 – 10.3.32.34	10.3.32.35
10	10.3.32.36/30	10.3.32.37 – 10.3.32.38	10.3.32.39
11	10.3.32.40/30	10.3.32.41 – 10.3.32.42	10.3.32.43
12	10.3.32.44/30	10.3.32.45 – 10.3.32.46	10.3.32.47
13	10.3.32.48/30	10.3.32.49 – 10.3.32.50	10.3.32.51
14	10.3.32.52/30	10.3.32.53 – 10.3.32.54	10.3.32.55
15	10.3.32.56/30	10.3.32.57 – 10.3.32.58	10.3.32.59
16	10.3.32.60/30	10.3.32.61 – 10.3.32.62	10.3.32.63
17	10.3.32.64/30	10.3.32.65 – 10.3.32.66	10.3.32.67
18	10.3.32.68/30	10.3.32.69 – 10.3.32.70	10.3.32.71
19	10.3.32.72/30	10.3.32.73 – 10.3.32.74	10.3.32.75
20	10.3.32.76/30	10.3.32.77 – 10.3.32.78	10.3.32.79
21	10.3.32.80/30	10.3.32.81 – 10.3.32.82	10.3.32.83
22	10.3.32.84/30	10.3.32.85 – 10.3.32.86	10.3.32.87
23	10.3.32.88/30	10.3.32.89 – 10.3.32.90	10.3.32.91
24	10.3.32.92/30	10.3.32.93 – 10.3.32.94	10.3.32.95
25	10.3.32.96/30	10.3.32.97 – 10.3.32.98	10.3.32.99
26	10.3.32.100/30	10.3.32.101 – 10.3.32.102	10.3.32.103
27	10.3.32.104/30	10.3.32.105 – 10.3.32.106	10.3.32.107
28	10.3.32.108/30	10.3.32.109 – 10.3.32.110	10.3.32.111
29	10.3.32.112/30	10.3.32.113 – 10.3.32.114	10.3.32.115
30	10.3.32.116/30	10.3.32.117 – 10.3.32.118	10.3.32.119
31	10.3.32.120/30	10.3.32.121 – 10.3.32.122	10.3.32.123
32	10.3.32.124/30	10.3.32.125 – 10.3.32.126	10.3.32.127
33	10.3.32.128/30	10.3.32.129 – 10.3.32.130	10.3.32.131
34	10.3.32.132/30	10.3.32.133 – 10.3.32.134	10.3.32.135
35	10.3.32.136/30	10.3.32.137 – 10.3.32.138	10.3.32.139
36	10.3.32.140/30	10.3.32.141 – 10.3.32.142	10.3.32.143
37	10.3.32.144/30	10.3.32.145 – 10.3.32.146	10.3.32.147
38	10.3.32.148/30	10.3.32.149 – 10.3.32.150	10.3.32.151
39	10.3.32.152/30	10.3.32.153 – 10.3.32.154	10.3.32.155
40	10.3.32.156/30	10.3.32.157 – 10.3.32.158	10.3.32.159
41	10.3.32.160/30	10.3.32.161 – 10.3.32.162	10.3.32.163
42	10.3.32.164/30	10.3.32.165 – 10.3.32.166	10.3.32.167
43	10.3.32.168/30	10.3.32.169 – 10.3.32.170	10.3.32.171
44	10.3.32.172/30	10.3.32.173 – 10.3.32.174	10.3.32.175
45	10.3.32.176/30	10.3.32.177 – 10.3.32.178	10.3.32.179
46	10.3.32.180/30	10.3.32.181 – 10.3.32.182	10.3.32.183
47	10.3.32.184/30	10.3.32.185 – 10.3.32.186	10.3.32.187
48	10.3.32.188/30	10.3.32.189 – 10.3.32.190	10.3.32.191
49	10.3.32.192/30	10.3.32.193 – 10.3.32.194	10.3.32.195
50	10.3.32.196/30	10.3.32.197 – 10.3.32.198	10.3.32.199
51	10.3.32.200/30	10.3.32.201 – 10.3.32.202	10.3.32.203
52	10.3.32.204/30	10.3.32.205 – 10.3.32.206	10.3.32.207
53	10.3.32.208/30	10.3.32.209 – 10.3.32.210	10.3.32.211
54	10.3.32.212/30	10.3.32.213 – 10.3.32.214	10.3.32.215
55	10.3.32.216/30	10.3.32.217 – 10.3.32.218	10.3.32.219
56	10.3.32.220/30	10.3.32.221 – 10.3.32.222	10.3.32.223
57	10.3.32.224/30	10.3.32.225 – 10.3.32.226	10.3.32.227
58	10.3.32.228/30	10.3.32.229 – 10.3.32.230	10.3.32.231
59	10.3.32.232/30	10.3.32.233 – 10.3.32.234	10.3.32.235
60	10.3.32.236/30	10.3.32.237 – 10.3.32.238	10.3.32.239
61	10.3.32.240/30	10.3.32.241 – 10.3.32.242	10.3.32.243
62	10.3.32.244/30	10.3.32.245 – 10.3.32.246	10.3.32.247
63	10.3.32.248/30	10.3.32.249 – 10.3.32.250	10.3.32.251
64	10.3.32.252/30	10.3.32.253 – 10.3.32.254	10.3.32.255
65	10.3.33.0/30	10.3.33.1 – 10.3.33.2	10.3.33.3
66	10.3.33.4/30	10.3.33.5 – 10.3.33.6	10.3.33.7
67	10.3.33.8/30	10.3.33.9 – 10.3.33.10	10.3.33.11
68	10.3.33.12/30	10.3.33.13 – 10.3.33.14	10.3.33.15
69	10.3.33.16/30	10.3.33.17 – 10.3.33.18	10.3.33.19
70	10.3.33.20/30	10.3.33.21 – 10.3.33.22	10.3.33.23
71	10.3.33.24/30	10.3.33.25 – 10.3.33.26	10.3.33.27
72	10.3.33.28/30	10.3.33.29 – 10.3.33.30	10.3.33.31
73	10.3.33.32/30	10.3.33.33 – 10.3.33.34	10.3.33.35
74	10.3.33.36/30	10.3.33.37 – 10.3.33.38	10.3.33.39
75	10.3.33.40/30	10.3.33.41 – 10.3.33.42	10.3.33.43
76	10.3.33.44/30	10.3.33.45 – 10.3.33.46	10.3.33.47
77	10.3.33.48/30	10.3.33.49 – 10.3.33.50	10.3.33.51
78	10.3.33.52/30	10.3.33.53 – 10.3.33.54	10.3.33.55
79	10.3.33.56/30	10.3.33.57 – 10.3.33.58	10.3.33.59
80	10.3.33.60/30	10.3.33.61 – 10.3.33.62	10.3.33.63
81	10.3.33.64/30	10.3.33.65 – 10.3.33.66	10.3.33.67
82	10.3.33.68/30	10.3.33.69 – 10.3.33.70	10.3.33.71
83	10.3.33.72/30	10.3.33.73 – 10.3.33.74	10.3.33.75
84	10.3.33.76/30	10.3.33.77 – 10.3.33.78	10.3.33.79
85	10.3.33.80/30	10.3.33.81 – 10.3.33.82	10.3.33.83
86	10.3.33.84/30	10.3.33.85 – 10.3.33.86	10.3.33.87
87	10.3.33.88/30	10.3.33.89 – 10.3.33.90	10.3.33.91
88	10.3.33.92/30	10.3.33.93 – 10.3.33.94	10.3.33.95
89	10.3.33.96/30	10.3.33.97 – 10.3.33.98	10.3.33.99
90	10.3.33.100/30	10.3.33.101 – 10.3.33.102	10.3.33.103
91	10.3.33.104/30	10.3.33.105 – 10.3.33.106	10.3.33.107
92	10.3.33.108/30	10.3.33.109 – 10.3.33.110	10.3.33.111
93	10.3.33.112/30	10.3.33.113 – 10.3.33.114	10.3.33.115
94	10.3.33.116/30	10.3.33.117 – 10.3.33.118	10.3.33.119
95	10.3.33.120/30	10.3.33.121 – 10.3.33.122	10.3.33.123
96	10.3.33.124/30	10.3.33.125 – 10.3.33.126	10.3.33.127
97	10.3.33.128/30	10.3.33.129 – 10.3.33.130	10.3.33.131
98	10.3.33.132/30	10.3.33.133 – 10.3.33.134	10.3.33.135
99	10.3.33.136/30	10.3.33.137 – 10.3.33.138	10.3.33.139
100	10.3.33.140/30	10.3.33.141 – 10.3.33.142	10.3.33.143
101	10.3.33.144/30	10.3.33.145 – 10.3.33.146	10.3.33.147
102	10.3.33.148/30	10.3.33.149 – 10.3.33.150	10.3.33.151
103	10.3.33.152/30	10.3.33.153 – 10.3.33.154	10.3.33.155
104	10.3.33.156/30	10.3.33.157 – 10.3.33.158	10.3.33.159
105	10.3.33.160/30	10.3.33.161 – 10.3.33.162	10.3.33.163
106	10.3.33.164/30	10.3.33.165 – 10.3.33.166	10.3.33.167
107	10.3.33.168/30	10.3.33.169 – 10.3.33.170	10.3.33.171
108	10.3.33.172/30	10.3.33.173 – 10.3.33.174	10.3.33.175
109	10.3.33.176/30	10.3.33.177 – 10.3.33.178	10.3.33.179
110	10.3.33.180/30	10.3.33.181 – 10.3.33.182	10.3.33.183
111	10.3.33.184/30	10.3.33.185 – 10.3.33.186	10.3.33.187
112	10.3.33.188/30	10.3.33.189 – 10.3.33.190	10.3.33.191
113	10.3.33.192/30	10.3.33.193 – 10.3.33.194	10.3.33.195
114	10.3.33.196/30	10.3.33.197 – 10.3.33.198	10.3.33.199
115	10.3.33.200/30	10.3.33.201 – 10.3.33.202	10.3.33.203
116	10.3.33.204/30	10.3.33.205 – 10.3.33.206	10.3.33.207
117	10.3.33.208/30	10.3.33.209 – 10.3.33.210	10.3.33.211
118	10.3.33.212/30	10.3.33.213 – 10.3.33.214	10.3.33.215
119	10.3.33.216/30	10.3.33.217 – 10.3.33.218	10.3.33.219
120	10.3.33.220/30	10.3.33.221 – 10.3.33.222	10.3.33.223
121	10.3.33.224/30	10.3.33.225 – 10.3.33.226	10.3.33.227
122	10.3.33.228/30	10.3.33.229 – 10.3.33.230	10.3.33.231
123	10.3.33.232/30	10.3.33.233 – 10.3.33.234	10.3.33.235
124	10.3.33.236/30	10.3.33.237 – 10.3.33.238	10.3.33.239
125	10.3.33.240/30	10.3.33.241 – 10.3.33.242	10.3.33.243
126	10.3.33.244/30	10.3.33.245 – 10.3.33.246	10.3.33.247
127	10.3.33.248/30	10.3.33.249 – 10.3.33.250	10.3.33.251
128	10.3.33.252/30	10.3.33.253 – 10.3.33.254	10.3.33.255
129	10.3.34.0/30	10.3.34.1 – 10.3.34.2	10.3.34.3
130	10.3.34.4/30	10.3.34.5 – 10.3.34.6	10.3.34.7
131	10.3.34.8/30	10.3.34.9 – 10.3.34.10	10.3.34.11
132	10.3.34.12/30	10.3.34.13 – 10.3.34.14	10.3.34.15
133	10.3.34.16/30	10.3.34.17 – 10.3.34.18	10.3.34.19
134	10.3.34.20/30	10.3.34.21 – 10.3.34.22	10.3.34.23
135	10.3.34.24/30	10.3.34.25 – 10.3.34.26	10.3.34.27
136	10.3.34.28/30	10.3.34.29 – 10.3.34.30	10.3.34.31
137	10.3.34.32/30	10.3.34.33 – 10.3.34.34	10.3.34.35
138	10.3.34.36/30	10.3.34.37 – 10.3.34.38	10.3.34.39
139	10.3.34.40/30	10.3.34.41 – 10.3.34.42	10.3.34.43
140	10.3.34.44/30	10.3.34.45 – 10.3.34.46	10.3.34.47
141	10.3.34.48/30	10.3.34.49 – 10.3.34.50	10.3.34.51
142	10.3.34.52/30	10.3.34.53 – 10.3.34.54	10.3.34.55
143	10.3.34.56/30	10.3.34.57 – 10.3.34.58	10.3.34.59
144	10.3.34.60/30	10.3.34.61 – 10.3.34.62	10.3.34.63
145	10.3.34.64/30	10.3.34.65 – 10.3.34.66	10.3.34.67
146	10.3.34.68/30	10.3.34.69 – 10.3.34.70	10.3.34.71
147	10.3.34.72/30	10.3.34.73 – 10.3.34.74	10.3.34.75
148	10.3.34.76/30	10.3.34.77 – 10.3.34.78	10.3.34.79
149	10.3.34.80/30	10.3.34.81 – 10.3.34.82	10.3.34.83
150	10.3.34.84/30	10.3.34.85 – 10.3.34.86	10.3.34.87
151	10.3.34.88/30	10.3.34.89 – 10.3.34.90	10.3.34.91
152	10.3.34.92/30	10.3.34.93 – 10.3.34.94	10.3.34.95
153	10.3.34.96/30	10.3.34.97 – 10.3.34.98	10.3.34.99
154	10.3.34.100/30	10.3.34.101 – 10.3.34.102	10.3.34.103
155	10.3.34.104/30	10.3.34.105 – 10.3.34.106	10.3.34.107
156	10.3.34.108/30	10.3.34.109 – 10.3.34.110	10.3.34.111
157	10.3.34.112/30	10.3.34.113 – 10.3.34.114	10.3.34.115
158	10.3.34.116/30	10.3.34.117 – 10.3.34.118	10.3.34.119
159	10.3.34.120/30	10.3.34.121 – 10.3.34.122	10.3.34.123
160	10.3.34.124/30	10.3.34.125 – 10.3.34.126	10.3.34.127
161	10.3.34.128/30	10.3.34.129 – 10.3.34.130	10.3.34.131
162	10.3.34.132/30	10.3.34.133 – 10.3.34.134	10.3.34.135
163	10.3.34.136/30	10.3.34.137 – 10.3.34.138	10.3.34.139
164	10.3.34.140/30	10.3.34.141 – 10.3.34.142	10.3.34.143
165	10.3.34.144/30	10.3.34.145 – 10.3.34.146	10.3.34.147
166	10.3.34.148/30	10.3.34.149 – 10.3.34.150	10.3.34.151
167	10.3.34.152/30	10.3.34.153 – 10.3.34.154	10.3.34.155
168	10.3.34.156/30	10.3.34.157 – 10.3.34.158	10.3.34.159
169	10.3.34.160/30	10.3.34.161 – 10.3.34.162	10.3.34.163
170	10.3.34.164/30	10.3.34.165 – 10.3.34.166	10.3.34.167
171	10.3.34.168/30	10.3.34.169 – 10.3.34.170	10.3.34.171
172	10.3.34.172/30	10.3.34.173 – 10.3.34.174	10.3.34.175
173	10.3.34.176/30	10.3.34.177 – 10.3.34.178	10.3.34.179
174	10.3.34.180/30	10.3.34.181 – 10.3.34.182	10.3.34.183
175	10.3.34.184/30	10.3.34.185 – 10.3.34.186	10.3.34.187
176	10.3.34.188/30	10.3.34.189 – 10.3.34.190	10.3.34.191
177	10.3.34.192/30	10.3.34.193 – 10.3.34.194	10.3.34.195
178	10.3.34.196/30	10.3.34.197 – 10.3.34.198	10.3.34.199
179	10.3.34.200/30	10.3.34.201 – 10.3.34.202	10.3.34.203
180	10.3.34.204/30	10.3.34.205 – 10.3.34.206	10.3.34.207
181	10.3.34.208/30	10.3.34.209 – 10.3.34.210	10.3.34.211
182	10.3.34.212/30	10.3.34.213 – 10.3.34.214	10.3.34.215
183	10.3.34.216/30	10.3.34.217 – 10.3.34.218	10.3.34.219
184	10.3.34.220/30	10.3.34.221 – 10.3.34.222	10.3.34.223
185	10.3.34.224/30	10.3.34.225 – 10.3.34.226	10.3.34.227
186	10.3.34.228/30	10.3.34.229 – 10.3.34.230	10.3.34.231
187	10.3.34.232/30	10.3.34.233 – 10.3.34.234	10.3.34.235
188	10.3.34.236/30	10.3.34.237 – 10.3.34.238	10.3.34.239
189	10.3.34.240/30	10.3.34.241 – 10.3.34.242	10.3.34.243
190	10.3.34.244/30	10.3.34.245 – 10.3.34.246	10.3.34.247
191	10.3.34.248/30	10.3.34.249 – 10.3.34.250	10.3.34.251
192	10.3.34.252/30	10.3.34.253 – 10.3.34.254	10.3.34.255
193	10.3.35.0/30	10.3.35.1 – 10.3.35.2	10.3.35.3
194	10.3.35.4/30	10.3.35.5 – 10.3.35.6	10.3.35.7
195	10.3.35.8/30	10.3.35.9 – 10.3.35.10	10.3.35.11
196	10.3.35.12/30	10.3.35.13 – 10.3.35.14	10.3.35.15
197	10.3.35.16/30	10.3.35.17 – 10.3.35.18	10.3.35.19
198	10.3.35.20/30	10.3.35.21 – 10.3.35.22	10.3.35.23
199	10.3.35.24/30	10.3.35.25 – 10.3.35.26	10.3.35.27
200	10.3.35.28/30	10.3.35.29 – 10.3.35.30	10.3.35.31
201	10.3.35.32/30	10.3.35.33 – 10.3.35.34	10.3.35.35
202	10.3.35.36/30	10.3.35.37 – 10.3.35.38	10.3.35.39
203	10.3.35.40/30	10.3.35.41 – 10.3.35.42	10.3.35.43
204	10.3.35.44/30	10.3.35.45 – 10.3.35.46	10.3.35.47
205	10.3.35.48/30	10.3.35.49 – 10.3.35.50	10.3.35.51
206	10.3.35.52/30	10.3.35.53 – 10.3.35.54	10.3.35.55
207	10.3.35.56/30	10.3.35.57 – 10.3.35.58	10.3.35.59
208	10.3.35.60/30	10.3.35.61 – 10.3.35.62	10.3.35.63
209	10.3.35.64/30	10.3.35.65 – 10.3.35.66	10.3.35.67
210	10.3.35.68/30	10.3.35.69 – 10.3.35.70	10.3.35.71
211	10.3.35.72/30	10.3.35.73 – 10.3.35.74	10.3.35.75
212	10.3.35.76/30	10.3.35.77 – 10.3.35.78	10.3.35.79
213	10.3.35.80/30	10.3.35.81 – 10.3.35.82	10.3.35.83
214	10.3.35.84/30	10.3.35.85 – 10.3.35.86	10.3.35.87
215	10.3.35.88/30	10.3.35.89 – 10.3.35.90	10.3.35.91
216	10.3.35.92/30	10.3.35.93 – 10.3.35.94	10.3.35.95
217	10.3.35.96/30	10.3.35.97 – 10.3.35.98	10.3.35.99
218	10.3.35.100/30	10.3.35.101 – 10.3.35.102	10.3.35.103
219	10.3.35.104/30	10.3.35.105 – 10.3.35.106	10.3.35.107
220	10.3.35.108/30	10.3.35.109 – 10.3.35.110	10.3.35.111
221	10.3.35.112/30	10.3.35.113 – 10.3.35.114	10.3.35.115
222	10.3.35.116/30	10.3.35.117 – 10.3.35.118	10.3.35.119
223	10.3.35.120/30	10.3.35.121 – 10.3.35.122	10.3.35.123
224	10.3.35.124/30	10.3.35.125 – 10.3.35.126	10.3.35.127
225	10.3.35.128/30	10.3.35.129 – 10.3.35.130	10.3.35.131
226	10.3.35.132/30	10.3.35.133 – 10.3.35.134	10.3.35.135
227	10.3.35.136/30	10.3.35.137 – 10.3.35.138	10.3.35.139
228	10.3.35.140/30	10.3.35.141 – 10.3.35.142	10.3.35.143
229	10.3.35.144/30	10.3.35.145 – 10.3.35.146	10.3.35.147
230	10.3.35.148/30	10.3.35.149 – 10.3.35.150	10.3.35.151
231	10.3.35.152/30	10.3.35.153 – 10.3.35.154	10.3.35.155
232	10.3.35.156/30	10.3.35.157 – 10.3.35.158	10.3.35.159
233	10.3.35.160/30	10.3.35.161 – 10.3.35.162	10.3.35.163
234	10.3.35.164/30	10.3.35.165 – 10.3.35.166	10.3.35.167
235	10.3.35.168/30	10.3.35.169 – 10.3.35.170	10.3.35.171
236	10.3.35.172/30	10.3.35.173 – 10.3.35.174	10.3.35.175
237	10.3.35.176/30	10.3.35.177 – 10.3.35.178	10.3.35.179
238	10.3.35.180/30	10.3.35.181 – 10.3.35.182	10.3.35.183
239	10.3.35.184/30	10.3.35.185 – 10.3.35.186	10.3.35.187
240	10.3.35.188/30	10.3.35.189 – 10.3.35.190	10.3.35.191
241	10.3.35.192/30	10.3.35.193 – 10.3.35.194	10.3.35.195
242	10.3.35.196/30	10.3.35.197 – 10.3.35.198	10.3.35.199
243	10.3.35.200/30	10.3.35.201 – 10.3.35.202	10.3.35.203
244	10.3.35.204/30	10.3.35.205 – 10.3.35.206	10.3.35.207
245	10.3.35.208/30	10.3.35.209 – 10.3.35.210	10.3.35.211
246	10.3.35.212/30	10.3.35.213 – 10.3.35.214	10.3.35.215
247	10.3.35.216/30	10.3.35.217 – 10.3.35.218	10.3.35.219
248	10.3.35.220/30	10.3.35.221 – 10.3.35.222	10.3.35.223
249	10.3.35.224/30	10.3.35.225 – 10.3.35.226	10.3.35.227
250	10.3.35.228/30	10.3.35.229 – 10.3.35.230	10.3.35.231
251	10.3.35.232/30	10.3.35.233 – 10.3.35.234	10.3.35.235
252	10.3.35.236/30	10.3.35.237 – 10.3.35.238	10.3.35.239
253	10.3.35.240/30	10.3.35.241 – 10.3.35.242	10.3.35.243
254	10.3.35.244/30	10.3.35.245 – 10.3.35.246	10.3.35.247
255	10.3.35.248/30	10.3.35.249 – 10.3.35.250	10.3.35.251
256	10.3.35.252/30	10.3.35.253 – 10.3.35.254	10.3.35.255

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 /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 →