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)10.5.56.0/21

network10.5.56.0/21

broadcast10.5.63.255

first host10.5.56.1

last host10.5.63.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.56.0/21

address00001010.00000101.00111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.00111000.00000000

broadcast00001010.00000101.00111111.11111111

green = network part, grey = host part

hex0x0a053800

decimal168114176

reverse dns0.56.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:3800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.5.56.0/30	10.5.56.1 – 10.5.56.2	10.5.56.3
2	10.5.56.4/30	10.5.56.5 – 10.5.56.6	10.5.56.7
3	10.5.56.8/30	10.5.56.9 – 10.5.56.10	10.5.56.11
4	10.5.56.12/30	10.5.56.13 – 10.5.56.14	10.5.56.15
5	10.5.56.16/30	10.5.56.17 – 10.5.56.18	10.5.56.19
6	10.5.56.20/30	10.5.56.21 – 10.5.56.22	10.5.56.23
7	10.5.56.24/30	10.5.56.25 – 10.5.56.26	10.5.56.27
8	10.5.56.28/30	10.5.56.29 – 10.5.56.30	10.5.56.31
9	10.5.56.32/30	10.5.56.33 – 10.5.56.34	10.5.56.35
10	10.5.56.36/30	10.5.56.37 – 10.5.56.38	10.5.56.39
11	10.5.56.40/30	10.5.56.41 – 10.5.56.42	10.5.56.43
12	10.5.56.44/30	10.5.56.45 – 10.5.56.46	10.5.56.47
13	10.5.56.48/30	10.5.56.49 – 10.5.56.50	10.5.56.51
14	10.5.56.52/30	10.5.56.53 – 10.5.56.54	10.5.56.55
15	10.5.56.56/30	10.5.56.57 – 10.5.56.58	10.5.56.59
16	10.5.56.60/30	10.5.56.61 – 10.5.56.62	10.5.56.63
17	10.5.56.64/30	10.5.56.65 – 10.5.56.66	10.5.56.67
18	10.5.56.68/30	10.5.56.69 – 10.5.56.70	10.5.56.71
19	10.5.56.72/30	10.5.56.73 – 10.5.56.74	10.5.56.75
20	10.5.56.76/30	10.5.56.77 – 10.5.56.78	10.5.56.79
21	10.5.56.80/30	10.5.56.81 – 10.5.56.82	10.5.56.83
22	10.5.56.84/30	10.5.56.85 – 10.5.56.86	10.5.56.87
23	10.5.56.88/30	10.5.56.89 – 10.5.56.90	10.5.56.91
24	10.5.56.92/30	10.5.56.93 – 10.5.56.94	10.5.56.95
25	10.5.56.96/30	10.5.56.97 – 10.5.56.98	10.5.56.99
26	10.5.56.100/30	10.5.56.101 – 10.5.56.102	10.5.56.103
27	10.5.56.104/30	10.5.56.105 – 10.5.56.106	10.5.56.107
28	10.5.56.108/30	10.5.56.109 – 10.5.56.110	10.5.56.111
29	10.5.56.112/30	10.5.56.113 – 10.5.56.114	10.5.56.115
30	10.5.56.116/30	10.5.56.117 – 10.5.56.118	10.5.56.119
31	10.5.56.120/30	10.5.56.121 – 10.5.56.122	10.5.56.123
32	10.5.56.124/30	10.5.56.125 – 10.5.56.126	10.5.56.127
33	10.5.56.128/30	10.5.56.129 – 10.5.56.130	10.5.56.131
34	10.5.56.132/30	10.5.56.133 – 10.5.56.134	10.5.56.135
35	10.5.56.136/30	10.5.56.137 – 10.5.56.138	10.5.56.139
36	10.5.56.140/30	10.5.56.141 – 10.5.56.142	10.5.56.143
37	10.5.56.144/30	10.5.56.145 – 10.5.56.146	10.5.56.147
38	10.5.56.148/30	10.5.56.149 – 10.5.56.150	10.5.56.151
39	10.5.56.152/30	10.5.56.153 – 10.5.56.154	10.5.56.155
40	10.5.56.156/30	10.5.56.157 – 10.5.56.158	10.5.56.159
41	10.5.56.160/30	10.5.56.161 – 10.5.56.162	10.5.56.163
42	10.5.56.164/30	10.5.56.165 – 10.5.56.166	10.5.56.167
43	10.5.56.168/30	10.5.56.169 – 10.5.56.170	10.5.56.171
44	10.5.56.172/30	10.5.56.173 – 10.5.56.174	10.5.56.175
45	10.5.56.176/30	10.5.56.177 – 10.5.56.178	10.5.56.179
46	10.5.56.180/30	10.5.56.181 – 10.5.56.182	10.5.56.183
47	10.5.56.184/30	10.5.56.185 – 10.5.56.186	10.5.56.187
48	10.5.56.188/30	10.5.56.189 – 10.5.56.190	10.5.56.191
49	10.5.56.192/30	10.5.56.193 – 10.5.56.194	10.5.56.195
50	10.5.56.196/30	10.5.56.197 – 10.5.56.198	10.5.56.199
51	10.5.56.200/30	10.5.56.201 – 10.5.56.202	10.5.56.203
52	10.5.56.204/30	10.5.56.205 – 10.5.56.206	10.5.56.207
53	10.5.56.208/30	10.5.56.209 – 10.5.56.210	10.5.56.211
54	10.5.56.212/30	10.5.56.213 – 10.5.56.214	10.5.56.215
55	10.5.56.216/30	10.5.56.217 – 10.5.56.218	10.5.56.219
56	10.5.56.220/30	10.5.56.221 – 10.5.56.222	10.5.56.223
57	10.5.56.224/30	10.5.56.225 – 10.5.56.226	10.5.56.227
58	10.5.56.228/30	10.5.56.229 – 10.5.56.230	10.5.56.231
59	10.5.56.232/30	10.5.56.233 – 10.5.56.234	10.5.56.235
60	10.5.56.236/30	10.5.56.237 – 10.5.56.238	10.5.56.239
61	10.5.56.240/30	10.5.56.241 – 10.5.56.242	10.5.56.243
62	10.5.56.244/30	10.5.56.245 – 10.5.56.246	10.5.56.247
63	10.5.56.248/30	10.5.56.249 – 10.5.56.250	10.5.56.251
64	10.5.56.252/30	10.5.56.253 – 10.5.56.254	10.5.56.255
65	10.5.57.0/30	10.5.57.1 – 10.5.57.2	10.5.57.3
66	10.5.57.4/30	10.5.57.5 – 10.5.57.6	10.5.57.7
67	10.5.57.8/30	10.5.57.9 – 10.5.57.10	10.5.57.11
68	10.5.57.12/30	10.5.57.13 – 10.5.57.14	10.5.57.15
69	10.5.57.16/30	10.5.57.17 – 10.5.57.18	10.5.57.19
70	10.5.57.20/30	10.5.57.21 – 10.5.57.22	10.5.57.23
71	10.5.57.24/30	10.5.57.25 – 10.5.57.26	10.5.57.27
72	10.5.57.28/30	10.5.57.29 – 10.5.57.30	10.5.57.31
73	10.5.57.32/30	10.5.57.33 – 10.5.57.34	10.5.57.35
74	10.5.57.36/30	10.5.57.37 – 10.5.57.38	10.5.57.39
75	10.5.57.40/30	10.5.57.41 – 10.5.57.42	10.5.57.43
76	10.5.57.44/30	10.5.57.45 – 10.5.57.46	10.5.57.47
77	10.5.57.48/30	10.5.57.49 – 10.5.57.50	10.5.57.51
78	10.5.57.52/30	10.5.57.53 – 10.5.57.54	10.5.57.55
79	10.5.57.56/30	10.5.57.57 – 10.5.57.58	10.5.57.59
80	10.5.57.60/30	10.5.57.61 – 10.5.57.62	10.5.57.63
81	10.5.57.64/30	10.5.57.65 – 10.5.57.66	10.5.57.67
82	10.5.57.68/30	10.5.57.69 – 10.5.57.70	10.5.57.71
83	10.5.57.72/30	10.5.57.73 – 10.5.57.74	10.5.57.75
84	10.5.57.76/30	10.5.57.77 – 10.5.57.78	10.5.57.79
85	10.5.57.80/30	10.5.57.81 – 10.5.57.82	10.5.57.83
86	10.5.57.84/30	10.5.57.85 – 10.5.57.86	10.5.57.87
87	10.5.57.88/30	10.5.57.89 – 10.5.57.90	10.5.57.91
88	10.5.57.92/30	10.5.57.93 – 10.5.57.94	10.5.57.95
89	10.5.57.96/30	10.5.57.97 – 10.5.57.98	10.5.57.99
90	10.5.57.100/30	10.5.57.101 – 10.5.57.102	10.5.57.103
91	10.5.57.104/30	10.5.57.105 – 10.5.57.106	10.5.57.107
92	10.5.57.108/30	10.5.57.109 – 10.5.57.110	10.5.57.111
93	10.5.57.112/30	10.5.57.113 – 10.5.57.114	10.5.57.115
94	10.5.57.116/30	10.5.57.117 – 10.5.57.118	10.5.57.119
95	10.5.57.120/30	10.5.57.121 – 10.5.57.122	10.5.57.123
96	10.5.57.124/30	10.5.57.125 – 10.5.57.126	10.5.57.127
97	10.5.57.128/30	10.5.57.129 – 10.5.57.130	10.5.57.131
98	10.5.57.132/30	10.5.57.133 – 10.5.57.134	10.5.57.135
99	10.5.57.136/30	10.5.57.137 – 10.5.57.138	10.5.57.139
100	10.5.57.140/30	10.5.57.141 – 10.5.57.142	10.5.57.143
101	10.5.57.144/30	10.5.57.145 – 10.5.57.146	10.5.57.147
102	10.5.57.148/30	10.5.57.149 – 10.5.57.150	10.5.57.151
103	10.5.57.152/30	10.5.57.153 – 10.5.57.154	10.5.57.155
104	10.5.57.156/30	10.5.57.157 – 10.5.57.158	10.5.57.159
105	10.5.57.160/30	10.5.57.161 – 10.5.57.162	10.5.57.163
106	10.5.57.164/30	10.5.57.165 – 10.5.57.166	10.5.57.167
107	10.5.57.168/30	10.5.57.169 – 10.5.57.170	10.5.57.171
108	10.5.57.172/30	10.5.57.173 – 10.5.57.174	10.5.57.175
109	10.5.57.176/30	10.5.57.177 – 10.5.57.178	10.5.57.179
110	10.5.57.180/30	10.5.57.181 – 10.5.57.182	10.5.57.183
111	10.5.57.184/30	10.5.57.185 – 10.5.57.186	10.5.57.187
112	10.5.57.188/30	10.5.57.189 – 10.5.57.190	10.5.57.191
113	10.5.57.192/30	10.5.57.193 – 10.5.57.194	10.5.57.195
114	10.5.57.196/30	10.5.57.197 – 10.5.57.198	10.5.57.199
115	10.5.57.200/30	10.5.57.201 – 10.5.57.202	10.5.57.203
116	10.5.57.204/30	10.5.57.205 – 10.5.57.206	10.5.57.207
117	10.5.57.208/30	10.5.57.209 – 10.5.57.210	10.5.57.211
118	10.5.57.212/30	10.5.57.213 – 10.5.57.214	10.5.57.215
119	10.5.57.216/30	10.5.57.217 – 10.5.57.218	10.5.57.219
120	10.5.57.220/30	10.5.57.221 – 10.5.57.222	10.5.57.223
121	10.5.57.224/30	10.5.57.225 – 10.5.57.226	10.5.57.227
122	10.5.57.228/30	10.5.57.229 – 10.5.57.230	10.5.57.231
123	10.5.57.232/30	10.5.57.233 – 10.5.57.234	10.5.57.235
124	10.5.57.236/30	10.5.57.237 – 10.5.57.238	10.5.57.239
125	10.5.57.240/30	10.5.57.241 – 10.5.57.242	10.5.57.243
126	10.5.57.244/30	10.5.57.245 – 10.5.57.246	10.5.57.247
127	10.5.57.248/30	10.5.57.249 – 10.5.57.250	10.5.57.251
128	10.5.57.252/30	10.5.57.253 – 10.5.57.254	10.5.57.255
129	10.5.58.0/30	10.5.58.1 – 10.5.58.2	10.5.58.3
130	10.5.58.4/30	10.5.58.5 – 10.5.58.6	10.5.58.7
131	10.5.58.8/30	10.5.58.9 – 10.5.58.10	10.5.58.11
132	10.5.58.12/30	10.5.58.13 – 10.5.58.14	10.5.58.15
133	10.5.58.16/30	10.5.58.17 – 10.5.58.18	10.5.58.19
134	10.5.58.20/30	10.5.58.21 – 10.5.58.22	10.5.58.23
135	10.5.58.24/30	10.5.58.25 – 10.5.58.26	10.5.58.27
136	10.5.58.28/30	10.5.58.29 – 10.5.58.30	10.5.58.31
137	10.5.58.32/30	10.5.58.33 – 10.5.58.34	10.5.58.35
138	10.5.58.36/30	10.5.58.37 – 10.5.58.38	10.5.58.39
139	10.5.58.40/30	10.5.58.41 – 10.5.58.42	10.5.58.43
140	10.5.58.44/30	10.5.58.45 – 10.5.58.46	10.5.58.47
141	10.5.58.48/30	10.5.58.49 – 10.5.58.50	10.5.58.51
142	10.5.58.52/30	10.5.58.53 – 10.5.58.54	10.5.58.55
143	10.5.58.56/30	10.5.58.57 – 10.5.58.58	10.5.58.59
144	10.5.58.60/30	10.5.58.61 – 10.5.58.62	10.5.58.63
145	10.5.58.64/30	10.5.58.65 – 10.5.58.66	10.5.58.67
146	10.5.58.68/30	10.5.58.69 – 10.5.58.70	10.5.58.71
147	10.5.58.72/30	10.5.58.73 – 10.5.58.74	10.5.58.75
148	10.5.58.76/30	10.5.58.77 – 10.5.58.78	10.5.58.79
149	10.5.58.80/30	10.5.58.81 – 10.5.58.82	10.5.58.83
150	10.5.58.84/30	10.5.58.85 – 10.5.58.86	10.5.58.87
151	10.5.58.88/30	10.5.58.89 – 10.5.58.90	10.5.58.91
152	10.5.58.92/30	10.5.58.93 – 10.5.58.94	10.5.58.95
153	10.5.58.96/30	10.5.58.97 – 10.5.58.98	10.5.58.99
154	10.5.58.100/30	10.5.58.101 – 10.5.58.102	10.5.58.103
155	10.5.58.104/30	10.5.58.105 – 10.5.58.106	10.5.58.107
156	10.5.58.108/30	10.5.58.109 – 10.5.58.110	10.5.58.111
157	10.5.58.112/30	10.5.58.113 – 10.5.58.114	10.5.58.115
158	10.5.58.116/30	10.5.58.117 – 10.5.58.118	10.5.58.119
159	10.5.58.120/30	10.5.58.121 – 10.5.58.122	10.5.58.123
160	10.5.58.124/30	10.5.58.125 – 10.5.58.126	10.5.58.127
161	10.5.58.128/30	10.5.58.129 – 10.5.58.130	10.5.58.131
162	10.5.58.132/30	10.5.58.133 – 10.5.58.134	10.5.58.135
163	10.5.58.136/30	10.5.58.137 – 10.5.58.138	10.5.58.139
164	10.5.58.140/30	10.5.58.141 – 10.5.58.142	10.5.58.143
165	10.5.58.144/30	10.5.58.145 – 10.5.58.146	10.5.58.147
166	10.5.58.148/30	10.5.58.149 – 10.5.58.150	10.5.58.151
167	10.5.58.152/30	10.5.58.153 – 10.5.58.154	10.5.58.155
168	10.5.58.156/30	10.5.58.157 – 10.5.58.158	10.5.58.159
169	10.5.58.160/30	10.5.58.161 – 10.5.58.162	10.5.58.163
170	10.5.58.164/30	10.5.58.165 – 10.5.58.166	10.5.58.167
171	10.5.58.168/30	10.5.58.169 – 10.5.58.170	10.5.58.171
172	10.5.58.172/30	10.5.58.173 – 10.5.58.174	10.5.58.175
173	10.5.58.176/30	10.5.58.177 – 10.5.58.178	10.5.58.179
174	10.5.58.180/30	10.5.58.181 – 10.5.58.182	10.5.58.183
175	10.5.58.184/30	10.5.58.185 – 10.5.58.186	10.5.58.187
176	10.5.58.188/30	10.5.58.189 – 10.5.58.190	10.5.58.191
177	10.5.58.192/30	10.5.58.193 – 10.5.58.194	10.5.58.195
178	10.5.58.196/30	10.5.58.197 – 10.5.58.198	10.5.58.199
179	10.5.58.200/30	10.5.58.201 – 10.5.58.202	10.5.58.203
180	10.5.58.204/30	10.5.58.205 – 10.5.58.206	10.5.58.207
181	10.5.58.208/30	10.5.58.209 – 10.5.58.210	10.5.58.211
182	10.5.58.212/30	10.5.58.213 – 10.5.58.214	10.5.58.215
183	10.5.58.216/30	10.5.58.217 – 10.5.58.218	10.5.58.219
184	10.5.58.220/30	10.5.58.221 – 10.5.58.222	10.5.58.223
185	10.5.58.224/30	10.5.58.225 – 10.5.58.226	10.5.58.227
186	10.5.58.228/30	10.5.58.229 – 10.5.58.230	10.5.58.231
187	10.5.58.232/30	10.5.58.233 – 10.5.58.234	10.5.58.235
188	10.5.58.236/30	10.5.58.237 – 10.5.58.238	10.5.58.239
189	10.5.58.240/30	10.5.58.241 – 10.5.58.242	10.5.58.243
190	10.5.58.244/30	10.5.58.245 – 10.5.58.246	10.5.58.247
191	10.5.58.248/30	10.5.58.249 – 10.5.58.250	10.5.58.251
192	10.5.58.252/30	10.5.58.253 – 10.5.58.254	10.5.58.255
193	10.5.59.0/30	10.5.59.1 – 10.5.59.2	10.5.59.3
194	10.5.59.4/30	10.5.59.5 – 10.5.59.6	10.5.59.7
195	10.5.59.8/30	10.5.59.9 – 10.5.59.10	10.5.59.11
196	10.5.59.12/30	10.5.59.13 – 10.5.59.14	10.5.59.15
197	10.5.59.16/30	10.5.59.17 – 10.5.59.18	10.5.59.19
198	10.5.59.20/30	10.5.59.21 – 10.5.59.22	10.5.59.23
199	10.5.59.24/30	10.5.59.25 – 10.5.59.26	10.5.59.27
200	10.5.59.28/30	10.5.59.29 – 10.5.59.30	10.5.59.31
201	10.5.59.32/30	10.5.59.33 – 10.5.59.34	10.5.59.35
202	10.5.59.36/30	10.5.59.37 – 10.5.59.38	10.5.59.39
203	10.5.59.40/30	10.5.59.41 – 10.5.59.42	10.5.59.43
204	10.5.59.44/30	10.5.59.45 – 10.5.59.46	10.5.59.47
205	10.5.59.48/30	10.5.59.49 – 10.5.59.50	10.5.59.51
206	10.5.59.52/30	10.5.59.53 – 10.5.59.54	10.5.59.55
207	10.5.59.56/30	10.5.59.57 – 10.5.59.58	10.5.59.59
208	10.5.59.60/30	10.5.59.61 – 10.5.59.62	10.5.59.63
209	10.5.59.64/30	10.5.59.65 – 10.5.59.66	10.5.59.67
210	10.5.59.68/30	10.5.59.69 – 10.5.59.70	10.5.59.71
211	10.5.59.72/30	10.5.59.73 – 10.5.59.74	10.5.59.75
212	10.5.59.76/30	10.5.59.77 – 10.5.59.78	10.5.59.79
213	10.5.59.80/30	10.5.59.81 – 10.5.59.82	10.5.59.83
214	10.5.59.84/30	10.5.59.85 – 10.5.59.86	10.5.59.87
215	10.5.59.88/30	10.5.59.89 – 10.5.59.90	10.5.59.91
216	10.5.59.92/30	10.5.59.93 – 10.5.59.94	10.5.59.95
217	10.5.59.96/30	10.5.59.97 – 10.5.59.98	10.5.59.99
218	10.5.59.100/30	10.5.59.101 – 10.5.59.102	10.5.59.103
219	10.5.59.104/30	10.5.59.105 – 10.5.59.106	10.5.59.107
220	10.5.59.108/30	10.5.59.109 – 10.5.59.110	10.5.59.111
221	10.5.59.112/30	10.5.59.113 – 10.5.59.114	10.5.59.115
222	10.5.59.116/30	10.5.59.117 – 10.5.59.118	10.5.59.119
223	10.5.59.120/30	10.5.59.121 – 10.5.59.122	10.5.59.123
224	10.5.59.124/30	10.5.59.125 – 10.5.59.126	10.5.59.127
225	10.5.59.128/30	10.5.59.129 – 10.5.59.130	10.5.59.131
226	10.5.59.132/30	10.5.59.133 – 10.5.59.134	10.5.59.135
227	10.5.59.136/30	10.5.59.137 – 10.5.59.138	10.5.59.139
228	10.5.59.140/30	10.5.59.141 – 10.5.59.142	10.5.59.143
229	10.5.59.144/30	10.5.59.145 – 10.5.59.146	10.5.59.147
230	10.5.59.148/30	10.5.59.149 – 10.5.59.150	10.5.59.151
231	10.5.59.152/30	10.5.59.153 – 10.5.59.154	10.5.59.155
232	10.5.59.156/30	10.5.59.157 – 10.5.59.158	10.5.59.159
233	10.5.59.160/30	10.5.59.161 – 10.5.59.162	10.5.59.163
234	10.5.59.164/30	10.5.59.165 – 10.5.59.166	10.5.59.167
235	10.5.59.168/30	10.5.59.169 – 10.5.59.170	10.5.59.171
236	10.5.59.172/30	10.5.59.173 – 10.5.59.174	10.5.59.175
237	10.5.59.176/30	10.5.59.177 – 10.5.59.178	10.5.59.179
238	10.5.59.180/30	10.5.59.181 – 10.5.59.182	10.5.59.183
239	10.5.59.184/30	10.5.59.185 – 10.5.59.186	10.5.59.187
240	10.5.59.188/30	10.5.59.189 – 10.5.59.190	10.5.59.191
241	10.5.59.192/30	10.5.59.193 – 10.5.59.194	10.5.59.195
242	10.5.59.196/30	10.5.59.197 – 10.5.59.198	10.5.59.199
243	10.5.59.200/30	10.5.59.201 – 10.5.59.202	10.5.59.203
244	10.5.59.204/30	10.5.59.205 – 10.5.59.206	10.5.59.207
245	10.5.59.208/30	10.5.59.209 – 10.5.59.210	10.5.59.211
246	10.5.59.212/30	10.5.59.213 – 10.5.59.214	10.5.59.215
247	10.5.59.216/30	10.5.59.217 – 10.5.59.218	10.5.59.219
248	10.5.59.220/30	10.5.59.221 – 10.5.59.222	10.5.59.223
249	10.5.59.224/30	10.5.59.225 – 10.5.59.226	10.5.59.227
250	10.5.59.228/30	10.5.59.229 – 10.5.59.230	10.5.59.231
251	10.5.59.232/30	10.5.59.233 – 10.5.59.234	10.5.59.235
252	10.5.59.236/30	10.5.59.237 – 10.5.59.238	10.5.59.239
253	10.5.59.240/30	10.5.59.241 – 10.5.59.242	10.5.59.243
254	10.5.59.244/30	10.5.59.245 – 10.5.59.246	10.5.59.247
255	10.5.59.248/30	10.5.59.249 – 10.5.59.250	10.5.59.251
256	10.5.59.252/30	10.5.59.253 – 10.5.59.254	10.5.59.255

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 →