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)10.6.56.0/21

network10.6.56.0/21

broadcast10.6.63.255

first host10.6.56.1

last host10.6.63.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.6.56.0/21

address00001010.00000110.00111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000110.00111000.00000000

broadcast00001010.00000110.00111111.11111111

green = network part, grey = host part

hex0x0a063800

decimal168179712

reverse dns0.56.6.10.in-addr.arpa

ipv4-mapped::ffff:a06:3800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.6.56.0/30	10.6.56.1 – 10.6.56.2	10.6.56.3
2	10.6.56.4/30	10.6.56.5 – 10.6.56.6	10.6.56.7
3	10.6.56.8/30	10.6.56.9 – 10.6.56.10	10.6.56.11
4	10.6.56.12/30	10.6.56.13 – 10.6.56.14	10.6.56.15
5	10.6.56.16/30	10.6.56.17 – 10.6.56.18	10.6.56.19
6	10.6.56.20/30	10.6.56.21 – 10.6.56.22	10.6.56.23
7	10.6.56.24/30	10.6.56.25 – 10.6.56.26	10.6.56.27
8	10.6.56.28/30	10.6.56.29 – 10.6.56.30	10.6.56.31
9	10.6.56.32/30	10.6.56.33 – 10.6.56.34	10.6.56.35
10	10.6.56.36/30	10.6.56.37 – 10.6.56.38	10.6.56.39
11	10.6.56.40/30	10.6.56.41 – 10.6.56.42	10.6.56.43
12	10.6.56.44/30	10.6.56.45 – 10.6.56.46	10.6.56.47
13	10.6.56.48/30	10.6.56.49 – 10.6.56.50	10.6.56.51
14	10.6.56.52/30	10.6.56.53 – 10.6.56.54	10.6.56.55
15	10.6.56.56/30	10.6.56.57 – 10.6.56.58	10.6.56.59
16	10.6.56.60/30	10.6.56.61 – 10.6.56.62	10.6.56.63
17	10.6.56.64/30	10.6.56.65 – 10.6.56.66	10.6.56.67
18	10.6.56.68/30	10.6.56.69 – 10.6.56.70	10.6.56.71
19	10.6.56.72/30	10.6.56.73 – 10.6.56.74	10.6.56.75
20	10.6.56.76/30	10.6.56.77 – 10.6.56.78	10.6.56.79
21	10.6.56.80/30	10.6.56.81 – 10.6.56.82	10.6.56.83
22	10.6.56.84/30	10.6.56.85 – 10.6.56.86	10.6.56.87
23	10.6.56.88/30	10.6.56.89 – 10.6.56.90	10.6.56.91
24	10.6.56.92/30	10.6.56.93 – 10.6.56.94	10.6.56.95
25	10.6.56.96/30	10.6.56.97 – 10.6.56.98	10.6.56.99
26	10.6.56.100/30	10.6.56.101 – 10.6.56.102	10.6.56.103
27	10.6.56.104/30	10.6.56.105 – 10.6.56.106	10.6.56.107
28	10.6.56.108/30	10.6.56.109 – 10.6.56.110	10.6.56.111
29	10.6.56.112/30	10.6.56.113 – 10.6.56.114	10.6.56.115
30	10.6.56.116/30	10.6.56.117 – 10.6.56.118	10.6.56.119
31	10.6.56.120/30	10.6.56.121 – 10.6.56.122	10.6.56.123
32	10.6.56.124/30	10.6.56.125 – 10.6.56.126	10.6.56.127
33	10.6.56.128/30	10.6.56.129 – 10.6.56.130	10.6.56.131
34	10.6.56.132/30	10.6.56.133 – 10.6.56.134	10.6.56.135
35	10.6.56.136/30	10.6.56.137 – 10.6.56.138	10.6.56.139
36	10.6.56.140/30	10.6.56.141 – 10.6.56.142	10.6.56.143
37	10.6.56.144/30	10.6.56.145 – 10.6.56.146	10.6.56.147
38	10.6.56.148/30	10.6.56.149 – 10.6.56.150	10.6.56.151
39	10.6.56.152/30	10.6.56.153 – 10.6.56.154	10.6.56.155
40	10.6.56.156/30	10.6.56.157 – 10.6.56.158	10.6.56.159
41	10.6.56.160/30	10.6.56.161 – 10.6.56.162	10.6.56.163
42	10.6.56.164/30	10.6.56.165 – 10.6.56.166	10.6.56.167
43	10.6.56.168/30	10.6.56.169 – 10.6.56.170	10.6.56.171
44	10.6.56.172/30	10.6.56.173 – 10.6.56.174	10.6.56.175
45	10.6.56.176/30	10.6.56.177 – 10.6.56.178	10.6.56.179
46	10.6.56.180/30	10.6.56.181 – 10.6.56.182	10.6.56.183
47	10.6.56.184/30	10.6.56.185 – 10.6.56.186	10.6.56.187
48	10.6.56.188/30	10.6.56.189 – 10.6.56.190	10.6.56.191
49	10.6.56.192/30	10.6.56.193 – 10.6.56.194	10.6.56.195
50	10.6.56.196/30	10.6.56.197 – 10.6.56.198	10.6.56.199
51	10.6.56.200/30	10.6.56.201 – 10.6.56.202	10.6.56.203
52	10.6.56.204/30	10.6.56.205 – 10.6.56.206	10.6.56.207
53	10.6.56.208/30	10.6.56.209 – 10.6.56.210	10.6.56.211
54	10.6.56.212/30	10.6.56.213 – 10.6.56.214	10.6.56.215
55	10.6.56.216/30	10.6.56.217 – 10.6.56.218	10.6.56.219
56	10.6.56.220/30	10.6.56.221 – 10.6.56.222	10.6.56.223
57	10.6.56.224/30	10.6.56.225 – 10.6.56.226	10.6.56.227
58	10.6.56.228/30	10.6.56.229 – 10.6.56.230	10.6.56.231
59	10.6.56.232/30	10.6.56.233 – 10.6.56.234	10.6.56.235
60	10.6.56.236/30	10.6.56.237 – 10.6.56.238	10.6.56.239
61	10.6.56.240/30	10.6.56.241 – 10.6.56.242	10.6.56.243
62	10.6.56.244/30	10.6.56.245 – 10.6.56.246	10.6.56.247
63	10.6.56.248/30	10.6.56.249 – 10.6.56.250	10.6.56.251
64	10.6.56.252/30	10.6.56.253 – 10.6.56.254	10.6.56.255
65	10.6.57.0/30	10.6.57.1 – 10.6.57.2	10.6.57.3
66	10.6.57.4/30	10.6.57.5 – 10.6.57.6	10.6.57.7
67	10.6.57.8/30	10.6.57.9 – 10.6.57.10	10.6.57.11
68	10.6.57.12/30	10.6.57.13 – 10.6.57.14	10.6.57.15
69	10.6.57.16/30	10.6.57.17 – 10.6.57.18	10.6.57.19
70	10.6.57.20/30	10.6.57.21 – 10.6.57.22	10.6.57.23
71	10.6.57.24/30	10.6.57.25 – 10.6.57.26	10.6.57.27
72	10.6.57.28/30	10.6.57.29 – 10.6.57.30	10.6.57.31
73	10.6.57.32/30	10.6.57.33 – 10.6.57.34	10.6.57.35
74	10.6.57.36/30	10.6.57.37 – 10.6.57.38	10.6.57.39
75	10.6.57.40/30	10.6.57.41 – 10.6.57.42	10.6.57.43
76	10.6.57.44/30	10.6.57.45 – 10.6.57.46	10.6.57.47
77	10.6.57.48/30	10.6.57.49 – 10.6.57.50	10.6.57.51
78	10.6.57.52/30	10.6.57.53 – 10.6.57.54	10.6.57.55
79	10.6.57.56/30	10.6.57.57 – 10.6.57.58	10.6.57.59
80	10.6.57.60/30	10.6.57.61 – 10.6.57.62	10.6.57.63
81	10.6.57.64/30	10.6.57.65 – 10.6.57.66	10.6.57.67
82	10.6.57.68/30	10.6.57.69 – 10.6.57.70	10.6.57.71
83	10.6.57.72/30	10.6.57.73 – 10.6.57.74	10.6.57.75
84	10.6.57.76/30	10.6.57.77 – 10.6.57.78	10.6.57.79
85	10.6.57.80/30	10.6.57.81 – 10.6.57.82	10.6.57.83
86	10.6.57.84/30	10.6.57.85 – 10.6.57.86	10.6.57.87
87	10.6.57.88/30	10.6.57.89 – 10.6.57.90	10.6.57.91
88	10.6.57.92/30	10.6.57.93 – 10.6.57.94	10.6.57.95
89	10.6.57.96/30	10.6.57.97 – 10.6.57.98	10.6.57.99
90	10.6.57.100/30	10.6.57.101 – 10.6.57.102	10.6.57.103
91	10.6.57.104/30	10.6.57.105 – 10.6.57.106	10.6.57.107
92	10.6.57.108/30	10.6.57.109 – 10.6.57.110	10.6.57.111
93	10.6.57.112/30	10.6.57.113 – 10.6.57.114	10.6.57.115
94	10.6.57.116/30	10.6.57.117 – 10.6.57.118	10.6.57.119
95	10.6.57.120/30	10.6.57.121 – 10.6.57.122	10.6.57.123
96	10.6.57.124/30	10.6.57.125 – 10.6.57.126	10.6.57.127
97	10.6.57.128/30	10.6.57.129 – 10.6.57.130	10.6.57.131
98	10.6.57.132/30	10.6.57.133 – 10.6.57.134	10.6.57.135
99	10.6.57.136/30	10.6.57.137 – 10.6.57.138	10.6.57.139
100	10.6.57.140/30	10.6.57.141 – 10.6.57.142	10.6.57.143
101	10.6.57.144/30	10.6.57.145 – 10.6.57.146	10.6.57.147
102	10.6.57.148/30	10.6.57.149 – 10.6.57.150	10.6.57.151
103	10.6.57.152/30	10.6.57.153 – 10.6.57.154	10.6.57.155
104	10.6.57.156/30	10.6.57.157 – 10.6.57.158	10.6.57.159
105	10.6.57.160/30	10.6.57.161 – 10.6.57.162	10.6.57.163
106	10.6.57.164/30	10.6.57.165 – 10.6.57.166	10.6.57.167
107	10.6.57.168/30	10.6.57.169 – 10.6.57.170	10.6.57.171
108	10.6.57.172/30	10.6.57.173 – 10.6.57.174	10.6.57.175
109	10.6.57.176/30	10.6.57.177 – 10.6.57.178	10.6.57.179
110	10.6.57.180/30	10.6.57.181 – 10.6.57.182	10.6.57.183
111	10.6.57.184/30	10.6.57.185 – 10.6.57.186	10.6.57.187
112	10.6.57.188/30	10.6.57.189 – 10.6.57.190	10.6.57.191
113	10.6.57.192/30	10.6.57.193 – 10.6.57.194	10.6.57.195
114	10.6.57.196/30	10.6.57.197 – 10.6.57.198	10.6.57.199
115	10.6.57.200/30	10.6.57.201 – 10.6.57.202	10.6.57.203
116	10.6.57.204/30	10.6.57.205 – 10.6.57.206	10.6.57.207
117	10.6.57.208/30	10.6.57.209 – 10.6.57.210	10.6.57.211
118	10.6.57.212/30	10.6.57.213 – 10.6.57.214	10.6.57.215
119	10.6.57.216/30	10.6.57.217 – 10.6.57.218	10.6.57.219
120	10.6.57.220/30	10.6.57.221 – 10.6.57.222	10.6.57.223
121	10.6.57.224/30	10.6.57.225 – 10.6.57.226	10.6.57.227
122	10.6.57.228/30	10.6.57.229 – 10.6.57.230	10.6.57.231
123	10.6.57.232/30	10.6.57.233 – 10.6.57.234	10.6.57.235
124	10.6.57.236/30	10.6.57.237 – 10.6.57.238	10.6.57.239
125	10.6.57.240/30	10.6.57.241 – 10.6.57.242	10.6.57.243
126	10.6.57.244/30	10.6.57.245 – 10.6.57.246	10.6.57.247
127	10.6.57.248/30	10.6.57.249 – 10.6.57.250	10.6.57.251
128	10.6.57.252/30	10.6.57.253 – 10.6.57.254	10.6.57.255
129	10.6.58.0/30	10.6.58.1 – 10.6.58.2	10.6.58.3
130	10.6.58.4/30	10.6.58.5 – 10.6.58.6	10.6.58.7
131	10.6.58.8/30	10.6.58.9 – 10.6.58.10	10.6.58.11
132	10.6.58.12/30	10.6.58.13 – 10.6.58.14	10.6.58.15
133	10.6.58.16/30	10.6.58.17 – 10.6.58.18	10.6.58.19
134	10.6.58.20/30	10.6.58.21 – 10.6.58.22	10.6.58.23
135	10.6.58.24/30	10.6.58.25 – 10.6.58.26	10.6.58.27
136	10.6.58.28/30	10.6.58.29 – 10.6.58.30	10.6.58.31
137	10.6.58.32/30	10.6.58.33 – 10.6.58.34	10.6.58.35
138	10.6.58.36/30	10.6.58.37 – 10.6.58.38	10.6.58.39
139	10.6.58.40/30	10.6.58.41 – 10.6.58.42	10.6.58.43
140	10.6.58.44/30	10.6.58.45 – 10.6.58.46	10.6.58.47
141	10.6.58.48/30	10.6.58.49 – 10.6.58.50	10.6.58.51
142	10.6.58.52/30	10.6.58.53 – 10.6.58.54	10.6.58.55
143	10.6.58.56/30	10.6.58.57 – 10.6.58.58	10.6.58.59
144	10.6.58.60/30	10.6.58.61 – 10.6.58.62	10.6.58.63
145	10.6.58.64/30	10.6.58.65 – 10.6.58.66	10.6.58.67
146	10.6.58.68/30	10.6.58.69 – 10.6.58.70	10.6.58.71
147	10.6.58.72/30	10.6.58.73 – 10.6.58.74	10.6.58.75
148	10.6.58.76/30	10.6.58.77 – 10.6.58.78	10.6.58.79
149	10.6.58.80/30	10.6.58.81 – 10.6.58.82	10.6.58.83
150	10.6.58.84/30	10.6.58.85 – 10.6.58.86	10.6.58.87
151	10.6.58.88/30	10.6.58.89 – 10.6.58.90	10.6.58.91
152	10.6.58.92/30	10.6.58.93 – 10.6.58.94	10.6.58.95
153	10.6.58.96/30	10.6.58.97 – 10.6.58.98	10.6.58.99
154	10.6.58.100/30	10.6.58.101 – 10.6.58.102	10.6.58.103
155	10.6.58.104/30	10.6.58.105 – 10.6.58.106	10.6.58.107
156	10.6.58.108/30	10.6.58.109 – 10.6.58.110	10.6.58.111
157	10.6.58.112/30	10.6.58.113 – 10.6.58.114	10.6.58.115
158	10.6.58.116/30	10.6.58.117 – 10.6.58.118	10.6.58.119
159	10.6.58.120/30	10.6.58.121 – 10.6.58.122	10.6.58.123
160	10.6.58.124/30	10.6.58.125 – 10.6.58.126	10.6.58.127
161	10.6.58.128/30	10.6.58.129 – 10.6.58.130	10.6.58.131
162	10.6.58.132/30	10.6.58.133 – 10.6.58.134	10.6.58.135
163	10.6.58.136/30	10.6.58.137 – 10.6.58.138	10.6.58.139
164	10.6.58.140/30	10.6.58.141 – 10.6.58.142	10.6.58.143
165	10.6.58.144/30	10.6.58.145 – 10.6.58.146	10.6.58.147
166	10.6.58.148/30	10.6.58.149 – 10.6.58.150	10.6.58.151
167	10.6.58.152/30	10.6.58.153 – 10.6.58.154	10.6.58.155
168	10.6.58.156/30	10.6.58.157 – 10.6.58.158	10.6.58.159
169	10.6.58.160/30	10.6.58.161 – 10.6.58.162	10.6.58.163
170	10.6.58.164/30	10.6.58.165 – 10.6.58.166	10.6.58.167
171	10.6.58.168/30	10.6.58.169 – 10.6.58.170	10.6.58.171
172	10.6.58.172/30	10.6.58.173 – 10.6.58.174	10.6.58.175
173	10.6.58.176/30	10.6.58.177 – 10.6.58.178	10.6.58.179
174	10.6.58.180/30	10.6.58.181 – 10.6.58.182	10.6.58.183
175	10.6.58.184/30	10.6.58.185 – 10.6.58.186	10.6.58.187
176	10.6.58.188/30	10.6.58.189 – 10.6.58.190	10.6.58.191
177	10.6.58.192/30	10.6.58.193 – 10.6.58.194	10.6.58.195
178	10.6.58.196/30	10.6.58.197 – 10.6.58.198	10.6.58.199
179	10.6.58.200/30	10.6.58.201 – 10.6.58.202	10.6.58.203
180	10.6.58.204/30	10.6.58.205 – 10.6.58.206	10.6.58.207
181	10.6.58.208/30	10.6.58.209 – 10.6.58.210	10.6.58.211
182	10.6.58.212/30	10.6.58.213 – 10.6.58.214	10.6.58.215
183	10.6.58.216/30	10.6.58.217 – 10.6.58.218	10.6.58.219
184	10.6.58.220/30	10.6.58.221 – 10.6.58.222	10.6.58.223
185	10.6.58.224/30	10.6.58.225 – 10.6.58.226	10.6.58.227
186	10.6.58.228/30	10.6.58.229 – 10.6.58.230	10.6.58.231
187	10.6.58.232/30	10.6.58.233 – 10.6.58.234	10.6.58.235
188	10.6.58.236/30	10.6.58.237 – 10.6.58.238	10.6.58.239
189	10.6.58.240/30	10.6.58.241 – 10.6.58.242	10.6.58.243
190	10.6.58.244/30	10.6.58.245 – 10.6.58.246	10.6.58.247
191	10.6.58.248/30	10.6.58.249 – 10.6.58.250	10.6.58.251
192	10.6.58.252/30	10.6.58.253 – 10.6.58.254	10.6.58.255
193	10.6.59.0/30	10.6.59.1 – 10.6.59.2	10.6.59.3
194	10.6.59.4/30	10.6.59.5 – 10.6.59.6	10.6.59.7
195	10.6.59.8/30	10.6.59.9 – 10.6.59.10	10.6.59.11
196	10.6.59.12/30	10.6.59.13 – 10.6.59.14	10.6.59.15
197	10.6.59.16/30	10.6.59.17 – 10.6.59.18	10.6.59.19
198	10.6.59.20/30	10.6.59.21 – 10.6.59.22	10.6.59.23
199	10.6.59.24/30	10.6.59.25 – 10.6.59.26	10.6.59.27
200	10.6.59.28/30	10.6.59.29 – 10.6.59.30	10.6.59.31
201	10.6.59.32/30	10.6.59.33 – 10.6.59.34	10.6.59.35
202	10.6.59.36/30	10.6.59.37 – 10.6.59.38	10.6.59.39
203	10.6.59.40/30	10.6.59.41 – 10.6.59.42	10.6.59.43
204	10.6.59.44/30	10.6.59.45 – 10.6.59.46	10.6.59.47
205	10.6.59.48/30	10.6.59.49 – 10.6.59.50	10.6.59.51
206	10.6.59.52/30	10.6.59.53 – 10.6.59.54	10.6.59.55
207	10.6.59.56/30	10.6.59.57 – 10.6.59.58	10.6.59.59
208	10.6.59.60/30	10.6.59.61 – 10.6.59.62	10.6.59.63
209	10.6.59.64/30	10.6.59.65 – 10.6.59.66	10.6.59.67
210	10.6.59.68/30	10.6.59.69 – 10.6.59.70	10.6.59.71
211	10.6.59.72/30	10.6.59.73 – 10.6.59.74	10.6.59.75
212	10.6.59.76/30	10.6.59.77 – 10.6.59.78	10.6.59.79
213	10.6.59.80/30	10.6.59.81 – 10.6.59.82	10.6.59.83
214	10.6.59.84/30	10.6.59.85 – 10.6.59.86	10.6.59.87
215	10.6.59.88/30	10.6.59.89 – 10.6.59.90	10.6.59.91
216	10.6.59.92/30	10.6.59.93 – 10.6.59.94	10.6.59.95
217	10.6.59.96/30	10.6.59.97 – 10.6.59.98	10.6.59.99
218	10.6.59.100/30	10.6.59.101 – 10.6.59.102	10.6.59.103
219	10.6.59.104/30	10.6.59.105 – 10.6.59.106	10.6.59.107
220	10.6.59.108/30	10.6.59.109 – 10.6.59.110	10.6.59.111
221	10.6.59.112/30	10.6.59.113 – 10.6.59.114	10.6.59.115
222	10.6.59.116/30	10.6.59.117 – 10.6.59.118	10.6.59.119
223	10.6.59.120/30	10.6.59.121 – 10.6.59.122	10.6.59.123
224	10.6.59.124/30	10.6.59.125 – 10.6.59.126	10.6.59.127
225	10.6.59.128/30	10.6.59.129 – 10.6.59.130	10.6.59.131
226	10.6.59.132/30	10.6.59.133 – 10.6.59.134	10.6.59.135
227	10.6.59.136/30	10.6.59.137 – 10.6.59.138	10.6.59.139
228	10.6.59.140/30	10.6.59.141 – 10.6.59.142	10.6.59.143
229	10.6.59.144/30	10.6.59.145 – 10.6.59.146	10.6.59.147
230	10.6.59.148/30	10.6.59.149 – 10.6.59.150	10.6.59.151
231	10.6.59.152/30	10.6.59.153 – 10.6.59.154	10.6.59.155
232	10.6.59.156/30	10.6.59.157 – 10.6.59.158	10.6.59.159
233	10.6.59.160/30	10.6.59.161 – 10.6.59.162	10.6.59.163
234	10.6.59.164/30	10.6.59.165 – 10.6.59.166	10.6.59.167
235	10.6.59.168/30	10.6.59.169 – 10.6.59.170	10.6.59.171
236	10.6.59.172/30	10.6.59.173 – 10.6.59.174	10.6.59.175
237	10.6.59.176/30	10.6.59.177 – 10.6.59.178	10.6.59.179
238	10.6.59.180/30	10.6.59.181 – 10.6.59.182	10.6.59.183
239	10.6.59.184/30	10.6.59.185 – 10.6.59.186	10.6.59.187
240	10.6.59.188/30	10.6.59.189 – 10.6.59.190	10.6.59.191
241	10.6.59.192/30	10.6.59.193 – 10.6.59.194	10.6.59.195
242	10.6.59.196/30	10.6.59.197 – 10.6.59.198	10.6.59.199
243	10.6.59.200/30	10.6.59.201 – 10.6.59.202	10.6.59.203
244	10.6.59.204/30	10.6.59.205 – 10.6.59.206	10.6.59.207
245	10.6.59.208/30	10.6.59.209 – 10.6.59.210	10.6.59.211
246	10.6.59.212/30	10.6.59.213 – 10.6.59.214	10.6.59.215
247	10.6.59.216/30	10.6.59.217 – 10.6.59.218	10.6.59.219
248	10.6.59.220/30	10.6.59.221 – 10.6.59.222	10.6.59.223
249	10.6.59.224/30	10.6.59.225 – 10.6.59.226	10.6.59.227
250	10.6.59.228/30	10.6.59.229 – 10.6.59.230	10.6.59.231
251	10.6.59.232/30	10.6.59.233 – 10.6.59.234	10.6.59.235
252	10.6.59.236/30	10.6.59.237 – 10.6.59.238	10.6.59.239
253	10.6.59.240/30	10.6.59.241 – 10.6.59.242	10.6.59.243
254	10.6.59.244/30	10.6.59.245 – 10.6.59.246	10.6.59.247
255	10.6.59.248/30	10.6.59.249 – 10.6.59.250	10.6.59.251
256	10.6.59.252/30	10.6.59.253 – 10.6.59.254	10.6.59.255

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 →