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)10.3.112.0/21

network10.3.112.0/21

broadcast10.3.119.255

first host10.3.112.1

last host10.3.119.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.112.0/21

address00001010.00000011.01110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.01110000.00000000

broadcast00001010.00000011.01110111.11111111

green = network part, grey = host part

hex0x0a037000

decimal167997440

reverse dns0.112.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:7000

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.112.0/30	10.3.112.1 – 10.3.112.2	10.3.112.3
2	10.3.112.4/30	10.3.112.5 – 10.3.112.6	10.3.112.7
3	10.3.112.8/30	10.3.112.9 – 10.3.112.10	10.3.112.11
4	10.3.112.12/30	10.3.112.13 – 10.3.112.14	10.3.112.15
5	10.3.112.16/30	10.3.112.17 – 10.3.112.18	10.3.112.19
6	10.3.112.20/30	10.3.112.21 – 10.3.112.22	10.3.112.23
7	10.3.112.24/30	10.3.112.25 – 10.3.112.26	10.3.112.27
8	10.3.112.28/30	10.3.112.29 – 10.3.112.30	10.3.112.31
9	10.3.112.32/30	10.3.112.33 – 10.3.112.34	10.3.112.35
10	10.3.112.36/30	10.3.112.37 – 10.3.112.38	10.3.112.39
11	10.3.112.40/30	10.3.112.41 – 10.3.112.42	10.3.112.43
12	10.3.112.44/30	10.3.112.45 – 10.3.112.46	10.3.112.47
13	10.3.112.48/30	10.3.112.49 – 10.3.112.50	10.3.112.51
14	10.3.112.52/30	10.3.112.53 – 10.3.112.54	10.3.112.55
15	10.3.112.56/30	10.3.112.57 – 10.3.112.58	10.3.112.59
16	10.3.112.60/30	10.3.112.61 – 10.3.112.62	10.3.112.63
17	10.3.112.64/30	10.3.112.65 – 10.3.112.66	10.3.112.67
18	10.3.112.68/30	10.3.112.69 – 10.3.112.70	10.3.112.71
19	10.3.112.72/30	10.3.112.73 – 10.3.112.74	10.3.112.75
20	10.3.112.76/30	10.3.112.77 – 10.3.112.78	10.3.112.79
21	10.3.112.80/30	10.3.112.81 – 10.3.112.82	10.3.112.83
22	10.3.112.84/30	10.3.112.85 – 10.3.112.86	10.3.112.87
23	10.3.112.88/30	10.3.112.89 – 10.3.112.90	10.3.112.91
24	10.3.112.92/30	10.3.112.93 – 10.3.112.94	10.3.112.95
25	10.3.112.96/30	10.3.112.97 – 10.3.112.98	10.3.112.99
26	10.3.112.100/30	10.3.112.101 – 10.3.112.102	10.3.112.103
27	10.3.112.104/30	10.3.112.105 – 10.3.112.106	10.3.112.107
28	10.3.112.108/30	10.3.112.109 – 10.3.112.110	10.3.112.111
29	10.3.112.112/30	10.3.112.113 – 10.3.112.114	10.3.112.115
30	10.3.112.116/30	10.3.112.117 – 10.3.112.118	10.3.112.119
31	10.3.112.120/30	10.3.112.121 – 10.3.112.122	10.3.112.123
32	10.3.112.124/30	10.3.112.125 – 10.3.112.126	10.3.112.127
33	10.3.112.128/30	10.3.112.129 – 10.3.112.130	10.3.112.131
34	10.3.112.132/30	10.3.112.133 – 10.3.112.134	10.3.112.135
35	10.3.112.136/30	10.3.112.137 – 10.3.112.138	10.3.112.139
36	10.3.112.140/30	10.3.112.141 – 10.3.112.142	10.3.112.143
37	10.3.112.144/30	10.3.112.145 – 10.3.112.146	10.3.112.147
38	10.3.112.148/30	10.3.112.149 – 10.3.112.150	10.3.112.151
39	10.3.112.152/30	10.3.112.153 – 10.3.112.154	10.3.112.155
40	10.3.112.156/30	10.3.112.157 – 10.3.112.158	10.3.112.159
41	10.3.112.160/30	10.3.112.161 – 10.3.112.162	10.3.112.163
42	10.3.112.164/30	10.3.112.165 – 10.3.112.166	10.3.112.167
43	10.3.112.168/30	10.3.112.169 – 10.3.112.170	10.3.112.171
44	10.3.112.172/30	10.3.112.173 – 10.3.112.174	10.3.112.175
45	10.3.112.176/30	10.3.112.177 – 10.3.112.178	10.3.112.179
46	10.3.112.180/30	10.3.112.181 – 10.3.112.182	10.3.112.183
47	10.3.112.184/30	10.3.112.185 – 10.3.112.186	10.3.112.187
48	10.3.112.188/30	10.3.112.189 – 10.3.112.190	10.3.112.191
49	10.3.112.192/30	10.3.112.193 – 10.3.112.194	10.3.112.195
50	10.3.112.196/30	10.3.112.197 – 10.3.112.198	10.3.112.199
51	10.3.112.200/30	10.3.112.201 – 10.3.112.202	10.3.112.203
52	10.3.112.204/30	10.3.112.205 – 10.3.112.206	10.3.112.207
53	10.3.112.208/30	10.3.112.209 – 10.3.112.210	10.3.112.211
54	10.3.112.212/30	10.3.112.213 – 10.3.112.214	10.3.112.215
55	10.3.112.216/30	10.3.112.217 – 10.3.112.218	10.3.112.219
56	10.3.112.220/30	10.3.112.221 – 10.3.112.222	10.3.112.223
57	10.3.112.224/30	10.3.112.225 – 10.3.112.226	10.3.112.227
58	10.3.112.228/30	10.3.112.229 – 10.3.112.230	10.3.112.231
59	10.3.112.232/30	10.3.112.233 – 10.3.112.234	10.3.112.235
60	10.3.112.236/30	10.3.112.237 – 10.3.112.238	10.3.112.239
61	10.3.112.240/30	10.3.112.241 – 10.3.112.242	10.3.112.243
62	10.3.112.244/30	10.3.112.245 – 10.3.112.246	10.3.112.247
63	10.3.112.248/30	10.3.112.249 – 10.3.112.250	10.3.112.251
64	10.3.112.252/30	10.3.112.253 – 10.3.112.254	10.3.112.255
65	10.3.113.0/30	10.3.113.1 – 10.3.113.2	10.3.113.3
66	10.3.113.4/30	10.3.113.5 – 10.3.113.6	10.3.113.7
67	10.3.113.8/30	10.3.113.9 – 10.3.113.10	10.3.113.11
68	10.3.113.12/30	10.3.113.13 – 10.3.113.14	10.3.113.15
69	10.3.113.16/30	10.3.113.17 – 10.3.113.18	10.3.113.19
70	10.3.113.20/30	10.3.113.21 – 10.3.113.22	10.3.113.23
71	10.3.113.24/30	10.3.113.25 – 10.3.113.26	10.3.113.27
72	10.3.113.28/30	10.3.113.29 – 10.3.113.30	10.3.113.31
73	10.3.113.32/30	10.3.113.33 – 10.3.113.34	10.3.113.35
74	10.3.113.36/30	10.3.113.37 – 10.3.113.38	10.3.113.39
75	10.3.113.40/30	10.3.113.41 – 10.3.113.42	10.3.113.43
76	10.3.113.44/30	10.3.113.45 – 10.3.113.46	10.3.113.47
77	10.3.113.48/30	10.3.113.49 – 10.3.113.50	10.3.113.51
78	10.3.113.52/30	10.3.113.53 – 10.3.113.54	10.3.113.55
79	10.3.113.56/30	10.3.113.57 – 10.3.113.58	10.3.113.59
80	10.3.113.60/30	10.3.113.61 – 10.3.113.62	10.3.113.63
81	10.3.113.64/30	10.3.113.65 – 10.3.113.66	10.3.113.67
82	10.3.113.68/30	10.3.113.69 – 10.3.113.70	10.3.113.71
83	10.3.113.72/30	10.3.113.73 – 10.3.113.74	10.3.113.75
84	10.3.113.76/30	10.3.113.77 – 10.3.113.78	10.3.113.79
85	10.3.113.80/30	10.3.113.81 – 10.3.113.82	10.3.113.83
86	10.3.113.84/30	10.3.113.85 – 10.3.113.86	10.3.113.87
87	10.3.113.88/30	10.3.113.89 – 10.3.113.90	10.3.113.91
88	10.3.113.92/30	10.3.113.93 – 10.3.113.94	10.3.113.95
89	10.3.113.96/30	10.3.113.97 – 10.3.113.98	10.3.113.99
90	10.3.113.100/30	10.3.113.101 – 10.3.113.102	10.3.113.103
91	10.3.113.104/30	10.3.113.105 – 10.3.113.106	10.3.113.107
92	10.3.113.108/30	10.3.113.109 – 10.3.113.110	10.3.113.111
93	10.3.113.112/30	10.3.113.113 – 10.3.113.114	10.3.113.115
94	10.3.113.116/30	10.3.113.117 – 10.3.113.118	10.3.113.119
95	10.3.113.120/30	10.3.113.121 – 10.3.113.122	10.3.113.123
96	10.3.113.124/30	10.3.113.125 – 10.3.113.126	10.3.113.127
97	10.3.113.128/30	10.3.113.129 – 10.3.113.130	10.3.113.131
98	10.3.113.132/30	10.3.113.133 – 10.3.113.134	10.3.113.135
99	10.3.113.136/30	10.3.113.137 – 10.3.113.138	10.3.113.139
100	10.3.113.140/30	10.3.113.141 – 10.3.113.142	10.3.113.143
101	10.3.113.144/30	10.3.113.145 – 10.3.113.146	10.3.113.147
102	10.3.113.148/30	10.3.113.149 – 10.3.113.150	10.3.113.151
103	10.3.113.152/30	10.3.113.153 – 10.3.113.154	10.3.113.155
104	10.3.113.156/30	10.3.113.157 – 10.3.113.158	10.3.113.159
105	10.3.113.160/30	10.3.113.161 – 10.3.113.162	10.3.113.163
106	10.3.113.164/30	10.3.113.165 – 10.3.113.166	10.3.113.167
107	10.3.113.168/30	10.3.113.169 – 10.3.113.170	10.3.113.171
108	10.3.113.172/30	10.3.113.173 – 10.3.113.174	10.3.113.175
109	10.3.113.176/30	10.3.113.177 – 10.3.113.178	10.3.113.179
110	10.3.113.180/30	10.3.113.181 – 10.3.113.182	10.3.113.183
111	10.3.113.184/30	10.3.113.185 – 10.3.113.186	10.3.113.187
112	10.3.113.188/30	10.3.113.189 – 10.3.113.190	10.3.113.191
113	10.3.113.192/30	10.3.113.193 – 10.3.113.194	10.3.113.195
114	10.3.113.196/30	10.3.113.197 – 10.3.113.198	10.3.113.199
115	10.3.113.200/30	10.3.113.201 – 10.3.113.202	10.3.113.203
116	10.3.113.204/30	10.3.113.205 – 10.3.113.206	10.3.113.207
117	10.3.113.208/30	10.3.113.209 – 10.3.113.210	10.3.113.211
118	10.3.113.212/30	10.3.113.213 – 10.3.113.214	10.3.113.215
119	10.3.113.216/30	10.3.113.217 – 10.3.113.218	10.3.113.219
120	10.3.113.220/30	10.3.113.221 – 10.3.113.222	10.3.113.223
121	10.3.113.224/30	10.3.113.225 – 10.3.113.226	10.3.113.227
122	10.3.113.228/30	10.3.113.229 – 10.3.113.230	10.3.113.231
123	10.3.113.232/30	10.3.113.233 – 10.3.113.234	10.3.113.235
124	10.3.113.236/30	10.3.113.237 – 10.3.113.238	10.3.113.239
125	10.3.113.240/30	10.3.113.241 – 10.3.113.242	10.3.113.243
126	10.3.113.244/30	10.3.113.245 – 10.3.113.246	10.3.113.247
127	10.3.113.248/30	10.3.113.249 – 10.3.113.250	10.3.113.251
128	10.3.113.252/30	10.3.113.253 – 10.3.113.254	10.3.113.255
129	10.3.114.0/30	10.3.114.1 – 10.3.114.2	10.3.114.3
130	10.3.114.4/30	10.3.114.5 – 10.3.114.6	10.3.114.7
131	10.3.114.8/30	10.3.114.9 – 10.3.114.10	10.3.114.11
132	10.3.114.12/30	10.3.114.13 – 10.3.114.14	10.3.114.15
133	10.3.114.16/30	10.3.114.17 – 10.3.114.18	10.3.114.19
134	10.3.114.20/30	10.3.114.21 – 10.3.114.22	10.3.114.23
135	10.3.114.24/30	10.3.114.25 – 10.3.114.26	10.3.114.27
136	10.3.114.28/30	10.3.114.29 – 10.3.114.30	10.3.114.31
137	10.3.114.32/30	10.3.114.33 – 10.3.114.34	10.3.114.35
138	10.3.114.36/30	10.3.114.37 – 10.3.114.38	10.3.114.39
139	10.3.114.40/30	10.3.114.41 – 10.3.114.42	10.3.114.43
140	10.3.114.44/30	10.3.114.45 – 10.3.114.46	10.3.114.47
141	10.3.114.48/30	10.3.114.49 – 10.3.114.50	10.3.114.51
142	10.3.114.52/30	10.3.114.53 – 10.3.114.54	10.3.114.55
143	10.3.114.56/30	10.3.114.57 – 10.3.114.58	10.3.114.59
144	10.3.114.60/30	10.3.114.61 – 10.3.114.62	10.3.114.63
145	10.3.114.64/30	10.3.114.65 – 10.3.114.66	10.3.114.67
146	10.3.114.68/30	10.3.114.69 – 10.3.114.70	10.3.114.71
147	10.3.114.72/30	10.3.114.73 – 10.3.114.74	10.3.114.75
148	10.3.114.76/30	10.3.114.77 – 10.3.114.78	10.3.114.79
149	10.3.114.80/30	10.3.114.81 – 10.3.114.82	10.3.114.83
150	10.3.114.84/30	10.3.114.85 – 10.3.114.86	10.3.114.87
151	10.3.114.88/30	10.3.114.89 – 10.3.114.90	10.3.114.91
152	10.3.114.92/30	10.3.114.93 – 10.3.114.94	10.3.114.95
153	10.3.114.96/30	10.3.114.97 – 10.3.114.98	10.3.114.99
154	10.3.114.100/30	10.3.114.101 – 10.3.114.102	10.3.114.103
155	10.3.114.104/30	10.3.114.105 – 10.3.114.106	10.3.114.107
156	10.3.114.108/30	10.3.114.109 – 10.3.114.110	10.3.114.111
157	10.3.114.112/30	10.3.114.113 – 10.3.114.114	10.3.114.115
158	10.3.114.116/30	10.3.114.117 – 10.3.114.118	10.3.114.119
159	10.3.114.120/30	10.3.114.121 – 10.3.114.122	10.3.114.123
160	10.3.114.124/30	10.3.114.125 – 10.3.114.126	10.3.114.127
161	10.3.114.128/30	10.3.114.129 – 10.3.114.130	10.3.114.131
162	10.3.114.132/30	10.3.114.133 – 10.3.114.134	10.3.114.135
163	10.3.114.136/30	10.3.114.137 – 10.3.114.138	10.3.114.139
164	10.3.114.140/30	10.3.114.141 – 10.3.114.142	10.3.114.143
165	10.3.114.144/30	10.3.114.145 – 10.3.114.146	10.3.114.147
166	10.3.114.148/30	10.3.114.149 – 10.3.114.150	10.3.114.151
167	10.3.114.152/30	10.3.114.153 – 10.3.114.154	10.3.114.155
168	10.3.114.156/30	10.3.114.157 – 10.3.114.158	10.3.114.159
169	10.3.114.160/30	10.3.114.161 – 10.3.114.162	10.3.114.163
170	10.3.114.164/30	10.3.114.165 – 10.3.114.166	10.3.114.167
171	10.3.114.168/30	10.3.114.169 – 10.3.114.170	10.3.114.171
172	10.3.114.172/30	10.3.114.173 – 10.3.114.174	10.3.114.175
173	10.3.114.176/30	10.3.114.177 – 10.3.114.178	10.3.114.179
174	10.3.114.180/30	10.3.114.181 – 10.3.114.182	10.3.114.183
175	10.3.114.184/30	10.3.114.185 – 10.3.114.186	10.3.114.187
176	10.3.114.188/30	10.3.114.189 – 10.3.114.190	10.3.114.191
177	10.3.114.192/30	10.3.114.193 – 10.3.114.194	10.3.114.195
178	10.3.114.196/30	10.3.114.197 – 10.3.114.198	10.3.114.199
179	10.3.114.200/30	10.3.114.201 – 10.3.114.202	10.3.114.203
180	10.3.114.204/30	10.3.114.205 – 10.3.114.206	10.3.114.207
181	10.3.114.208/30	10.3.114.209 – 10.3.114.210	10.3.114.211
182	10.3.114.212/30	10.3.114.213 – 10.3.114.214	10.3.114.215
183	10.3.114.216/30	10.3.114.217 – 10.3.114.218	10.3.114.219
184	10.3.114.220/30	10.3.114.221 – 10.3.114.222	10.3.114.223
185	10.3.114.224/30	10.3.114.225 – 10.3.114.226	10.3.114.227
186	10.3.114.228/30	10.3.114.229 – 10.3.114.230	10.3.114.231
187	10.3.114.232/30	10.3.114.233 – 10.3.114.234	10.3.114.235
188	10.3.114.236/30	10.3.114.237 – 10.3.114.238	10.3.114.239
189	10.3.114.240/30	10.3.114.241 – 10.3.114.242	10.3.114.243
190	10.3.114.244/30	10.3.114.245 – 10.3.114.246	10.3.114.247
191	10.3.114.248/30	10.3.114.249 – 10.3.114.250	10.3.114.251
192	10.3.114.252/30	10.3.114.253 – 10.3.114.254	10.3.114.255
193	10.3.115.0/30	10.3.115.1 – 10.3.115.2	10.3.115.3
194	10.3.115.4/30	10.3.115.5 – 10.3.115.6	10.3.115.7
195	10.3.115.8/30	10.3.115.9 – 10.3.115.10	10.3.115.11
196	10.3.115.12/30	10.3.115.13 – 10.3.115.14	10.3.115.15
197	10.3.115.16/30	10.3.115.17 – 10.3.115.18	10.3.115.19
198	10.3.115.20/30	10.3.115.21 – 10.3.115.22	10.3.115.23
199	10.3.115.24/30	10.3.115.25 – 10.3.115.26	10.3.115.27
200	10.3.115.28/30	10.3.115.29 – 10.3.115.30	10.3.115.31
201	10.3.115.32/30	10.3.115.33 – 10.3.115.34	10.3.115.35
202	10.3.115.36/30	10.3.115.37 – 10.3.115.38	10.3.115.39
203	10.3.115.40/30	10.3.115.41 – 10.3.115.42	10.3.115.43
204	10.3.115.44/30	10.3.115.45 – 10.3.115.46	10.3.115.47
205	10.3.115.48/30	10.3.115.49 – 10.3.115.50	10.3.115.51
206	10.3.115.52/30	10.3.115.53 – 10.3.115.54	10.3.115.55
207	10.3.115.56/30	10.3.115.57 – 10.3.115.58	10.3.115.59
208	10.3.115.60/30	10.3.115.61 – 10.3.115.62	10.3.115.63
209	10.3.115.64/30	10.3.115.65 – 10.3.115.66	10.3.115.67
210	10.3.115.68/30	10.3.115.69 – 10.3.115.70	10.3.115.71
211	10.3.115.72/30	10.3.115.73 – 10.3.115.74	10.3.115.75
212	10.3.115.76/30	10.3.115.77 – 10.3.115.78	10.3.115.79
213	10.3.115.80/30	10.3.115.81 – 10.3.115.82	10.3.115.83
214	10.3.115.84/30	10.3.115.85 – 10.3.115.86	10.3.115.87
215	10.3.115.88/30	10.3.115.89 – 10.3.115.90	10.3.115.91
216	10.3.115.92/30	10.3.115.93 – 10.3.115.94	10.3.115.95
217	10.3.115.96/30	10.3.115.97 – 10.3.115.98	10.3.115.99
218	10.3.115.100/30	10.3.115.101 – 10.3.115.102	10.3.115.103
219	10.3.115.104/30	10.3.115.105 – 10.3.115.106	10.3.115.107
220	10.3.115.108/30	10.3.115.109 – 10.3.115.110	10.3.115.111
221	10.3.115.112/30	10.3.115.113 – 10.3.115.114	10.3.115.115
222	10.3.115.116/30	10.3.115.117 – 10.3.115.118	10.3.115.119
223	10.3.115.120/30	10.3.115.121 – 10.3.115.122	10.3.115.123
224	10.3.115.124/30	10.3.115.125 – 10.3.115.126	10.3.115.127
225	10.3.115.128/30	10.3.115.129 – 10.3.115.130	10.3.115.131
226	10.3.115.132/30	10.3.115.133 – 10.3.115.134	10.3.115.135
227	10.3.115.136/30	10.3.115.137 – 10.3.115.138	10.3.115.139
228	10.3.115.140/30	10.3.115.141 – 10.3.115.142	10.3.115.143
229	10.3.115.144/30	10.3.115.145 – 10.3.115.146	10.3.115.147
230	10.3.115.148/30	10.3.115.149 – 10.3.115.150	10.3.115.151
231	10.3.115.152/30	10.3.115.153 – 10.3.115.154	10.3.115.155
232	10.3.115.156/30	10.3.115.157 – 10.3.115.158	10.3.115.159
233	10.3.115.160/30	10.3.115.161 – 10.3.115.162	10.3.115.163
234	10.3.115.164/30	10.3.115.165 – 10.3.115.166	10.3.115.167
235	10.3.115.168/30	10.3.115.169 – 10.3.115.170	10.3.115.171
236	10.3.115.172/30	10.3.115.173 – 10.3.115.174	10.3.115.175
237	10.3.115.176/30	10.3.115.177 – 10.3.115.178	10.3.115.179
238	10.3.115.180/30	10.3.115.181 – 10.3.115.182	10.3.115.183
239	10.3.115.184/30	10.3.115.185 – 10.3.115.186	10.3.115.187
240	10.3.115.188/30	10.3.115.189 – 10.3.115.190	10.3.115.191
241	10.3.115.192/30	10.3.115.193 – 10.3.115.194	10.3.115.195
242	10.3.115.196/30	10.3.115.197 – 10.3.115.198	10.3.115.199
243	10.3.115.200/30	10.3.115.201 – 10.3.115.202	10.3.115.203
244	10.3.115.204/30	10.3.115.205 – 10.3.115.206	10.3.115.207
245	10.3.115.208/30	10.3.115.209 – 10.3.115.210	10.3.115.211
246	10.3.115.212/30	10.3.115.213 – 10.3.115.214	10.3.115.215
247	10.3.115.216/30	10.3.115.217 – 10.3.115.218	10.3.115.219
248	10.3.115.220/30	10.3.115.221 – 10.3.115.222	10.3.115.223
249	10.3.115.224/30	10.3.115.225 – 10.3.115.226	10.3.115.227
250	10.3.115.228/30	10.3.115.229 – 10.3.115.230	10.3.115.231
251	10.3.115.232/30	10.3.115.233 – 10.3.115.234	10.3.115.235
252	10.3.115.236/30	10.3.115.237 – 10.3.115.238	10.3.115.239
253	10.3.115.240/30	10.3.115.241 – 10.3.115.242	10.3.115.243
254	10.3.115.244/30	10.3.115.245 – 10.3.115.246	10.3.115.247
255	10.3.115.248/30	10.3.115.249 – 10.3.115.250	10.3.115.251
256	10.3.115.252/30	10.3.115.253 – 10.3.115.254	10.3.115.255

showing 256 of 512

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 →