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)10.4.72.0/21

network10.4.72.0/21

broadcast10.4.79.255

first host10.4.72.1

last host10.4.79.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.72.0/21

address00001010.00000100.01001000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.01001000.00000000

broadcast00001010.00000100.01001111.11111111

green = network part, grey = host part

hex0x0a044800

decimal168052736

reverse dns0.72.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:4800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.4.72.0/30	10.4.72.1 – 10.4.72.2	10.4.72.3
2	10.4.72.4/30	10.4.72.5 – 10.4.72.6	10.4.72.7
3	10.4.72.8/30	10.4.72.9 – 10.4.72.10	10.4.72.11
4	10.4.72.12/30	10.4.72.13 – 10.4.72.14	10.4.72.15
5	10.4.72.16/30	10.4.72.17 – 10.4.72.18	10.4.72.19
6	10.4.72.20/30	10.4.72.21 – 10.4.72.22	10.4.72.23
7	10.4.72.24/30	10.4.72.25 – 10.4.72.26	10.4.72.27
8	10.4.72.28/30	10.4.72.29 – 10.4.72.30	10.4.72.31
9	10.4.72.32/30	10.4.72.33 – 10.4.72.34	10.4.72.35
10	10.4.72.36/30	10.4.72.37 – 10.4.72.38	10.4.72.39
11	10.4.72.40/30	10.4.72.41 – 10.4.72.42	10.4.72.43
12	10.4.72.44/30	10.4.72.45 – 10.4.72.46	10.4.72.47
13	10.4.72.48/30	10.4.72.49 – 10.4.72.50	10.4.72.51
14	10.4.72.52/30	10.4.72.53 – 10.4.72.54	10.4.72.55
15	10.4.72.56/30	10.4.72.57 – 10.4.72.58	10.4.72.59
16	10.4.72.60/30	10.4.72.61 – 10.4.72.62	10.4.72.63
17	10.4.72.64/30	10.4.72.65 – 10.4.72.66	10.4.72.67
18	10.4.72.68/30	10.4.72.69 – 10.4.72.70	10.4.72.71
19	10.4.72.72/30	10.4.72.73 – 10.4.72.74	10.4.72.75
20	10.4.72.76/30	10.4.72.77 – 10.4.72.78	10.4.72.79
21	10.4.72.80/30	10.4.72.81 – 10.4.72.82	10.4.72.83
22	10.4.72.84/30	10.4.72.85 – 10.4.72.86	10.4.72.87
23	10.4.72.88/30	10.4.72.89 – 10.4.72.90	10.4.72.91
24	10.4.72.92/30	10.4.72.93 – 10.4.72.94	10.4.72.95
25	10.4.72.96/30	10.4.72.97 – 10.4.72.98	10.4.72.99
26	10.4.72.100/30	10.4.72.101 – 10.4.72.102	10.4.72.103
27	10.4.72.104/30	10.4.72.105 – 10.4.72.106	10.4.72.107
28	10.4.72.108/30	10.4.72.109 – 10.4.72.110	10.4.72.111
29	10.4.72.112/30	10.4.72.113 – 10.4.72.114	10.4.72.115
30	10.4.72.116/30	10.4.72.117 – 10.4.72.118	10.4.72.119
31	10.4.72.120/30	10.4.72.121 – 10.4.72.122	10.4.72.123
32	10.4.72.124/30	10.4.72.125 – 10.4.72.126	10.4.72.127
33	10.4.72.128/30	10.4.72.129 – 10.4.72.130	10.4.72.131
34	10.4.72.132/30	10.4.72.133 – 10.4.72.134	10.4.72.135
35	10.4.72.136/30	10.4.72.137 – 10.4.72.138	10.4.72.139
36	10.4.72.140/30	10.4.72.141 – 10.4.72.142	10.4.72.143
37	10.4.72.144/30	10.4.72.145 – 10.4.72.146	10.4.72.147
38	10.4.72.148/30	10.4.72.149 – 10.4.72.150	10.4.72.151
39	10.4.72.152/30	10.4.72.153 – 10.4.72.154	10.4.72.155
40	10.4.72.156/30	10.4.72.157 – 10.4.72.158	10.4.72.159
41	10.4.72.160/30	10.4.72.161 – 10.4.72.162	10.4.72.163
42	10.4.72.164/30	10.4.72.165 – 10.4.72.166	10.4.72.167
43	10.4.72.168/30	10.4.72.169 – 10.4.72.170	10.4.72.171
44	10.4.72.172/30	10.4.72.173 – 10.4.72.174	10.4.72.175
45	10.4.72.176/30	10.4.72.177 – 10.4.72.178	10.4.72.179
46	10.4.72.180/30	10.4.72.181 – 10.4.72.182	10.4.72.183
47	10.4.72.184/30	10.4.72.185 – 10.4.72.186	10.4.72.187
48	10.4.72.188/30	10.4.72.189 – 10.4.72.190	10.4.72.191
49	10.4.72.192/30	10.4.72.193 – 10.4.72.194	10.4.72.195
50	10.4.72.196/30	10.4.72.197 – 10.4.72.198	10.4.72.199
51	10.4.72.200/30	10.4.72.201 – 10.4.72.202	10.4.72.203
52	10.4.72.204/30	10.4.72.205 – 10.4.72.206	10.4.72.207
53	10.4.72.208/30	10.4.72.209 – 10.4.72.210	10.4.72.211
54	10.4.72.212/30	10.4.72.213 – 10.4.72.214	10.4.72.215
55	10.4.72.216/30	10.4.72.217 – 10.4.72.218	10.4.72.219
56	10.4.72.220/30	10.4.72.221 – 10.4.72.222	10.4.72.223
57	10.4.72.224/30	10.4.72.225 – 10.4.72.226	10.4.72.227
58	10.4.72.228/30	10.4.72.229 – 10.4.72.230	10.4.72.231
59	10.4.72.232/30	10.4.72.233 – 10.4.72.234	10.4.72.235
60	10.4.72.236/30	10.4.72.237 – 10.4.72.238	10.4.72.239
61	10.4.72.240/30	10.4.72.241 – 10.4.72.242	10.4.72.243
62	10.4.72.244/30	10.4.72.245 – 10.4.72.246	10.4.72.247
63	10.4.72.248/30	10.4.72.249 – 10.4.72.250	10.4.72.251
64	10.4.72.252/30	10.4.72.253 – 10.4.72.254	10.4.72.255
65	10.4.73.0/30	10.4.73.1 – 10.4.73.2	10.4.73.3
66	10.4.73.4/30	10.4.73.5 – 10.4.73.6	10.4.73.7
67	10.4.73.8/30	10.4.73.9 – 10.4.73.10	10.4.73.11
68	10.4.73.12/30	10.4.73.13 – 10.4.73.14	10.4.73.15
69	10.4.73.16/30	10.4.73.17 – 10.4.73.18	10.4.73.19
70	10.4.73.20/30	10.4.73.21 – 10.4.73.22	10.4.73.23
71	10.4.73.24/30	10.4.73.25 – 10.4.73.26	10.4.73.27
72	10.4.73.28/30	10.4.73.29 – 10.4.73.30	10.4.73.31
73	10.4.73.32/30	10.4.73.33 – 10.4.73.34	10.4.73.35
74	10.4.73.36/30	10.4.73.37 – 10.4.73.38	10.4.73.39
75	10.4.73.40/30	10.4.73.41 – 10.4.73.42	10.4.73.43
76	10.4.73.44/30	10.4.73.45 – 10.4.73.46	10.4.73.47
77	10.4.73.48/30	10.4.73.49 – 10.4.73.50	10.4.73.51
78	10.4.73.52/30	10.4.73.53 – 10.4.73.54	10.4.73.55
79	10.4.73.56/30	10.4.73.57 – 10.4.73.58	10.4.73.59
80	10.4.73.60/30	10.4.73.61 – 10.4.73.62	10.4.73.63
81	10.4.73.64/30	10.4.73.65 – 10.4.73.66	10.4.73.67
82	10.4.73.68/30	10.4.73.69 – 10.4.73.70	10.4.73.71
83	10.4.73.72/30	10.4.73.73 – 10.4.73.74	10.4.73.75
84	10.4.73.76/30	10.4.73.77 – 10.4.73.78	10.4.73.79
85	10.4.73.80/30	10.4.73.81 – 10.4.73.82	10.4.73.83
86	10.4.73.84/30	10.4.73.85 – 10.4.73.86	10.4.73.87
87	10.4.73.88/30	10.4.73.89 – 10.4.73.90	10.4.73.91
88	10.4.73.92/30	10.4.73.93 – 10.4.73.94	10.4.73.95
89	10.4.73.96/30	10.4.73.97 – 10.4.73.98	10.4.73.99
90	10.4.73.100/30	10.4.73.101 – 10.4.73.102	10.4.73.103
91	10.4.73.104/30	10.4.73.105 – 10.4.73.106	10.4.73.107
92	10.4.73.108/30	10.4.73.109 – 10.4.73.110	10.4.73.111
93	10.4.73.112/30	10.4.73.113 – 10.4.73.114	10.4.73.115
94	10.4.73.116/30	10.4.73.117 – 10.4.73.118	10.4.73.119
95	10.4.73.120/30	10.4.73.121 – 10.4.73.122	10.4.73.123
96	10.4.73.124/30	10.4.73.125 – 10.4.73.126	10.4.73.127
97	10.4.73.128/30	10.4.73.129 – 10.4.73.130	10.4.73.131
98	10.4.73.132/30	10.4.73.133 – 10.4.73.134	10.4.73.135
99	10.4.73.136/30	10.4.73.137 – 10.4.73.138	10.4.73.139
100	10.4.73.140/30	10.4.73.141 – 10.4.73.142	10.4.73.143
101	10.4.73.144/30	10.4.73.145 – 10.4.73.146	10.4.73.147
102	10.4.73.148/30	10.4.73.149 – 10.4.73.150	10.4.73.151
103	10.4.73.152/30	10.4.73.153 – 10.4.73.154	10.4.73.155
104	10.4.73.156/30	10.4.73.157 – 10.4.73.158	10.4.73.159
105	10.4.73.160/30	10.4.73.161 – 10.4.73.162	10.4.73.163
106	10.4.73.164/30	10.4.73.165 – 10.4.73.166	10.4.73.167
107	10.4.73.168/30	10.4.73.169 – 10.4.73.170	10.4.73.171
108	10.4.73.172/30	10.4.73.173 – 10.4.73.174	10.4.73.175
109	10.4.73.176/30	10.4.73.177 – 10.4.73.178	10.4.73.179
110	10.4.73.180/30	10.4.73.181 – 10.4.73.182	10.4.73.183
111	10.4.73.184/30	10.4.73.185 – 10.4.73.186	10.4.73.187
112	10.4.73.188/30	10.4.73.189 – 10.4.73.190	10.4.73.191
113	10.4.73.192/30	10.4.73.193 – 10.4.73.194	10.4.73.195
114	10.4.73.196/30	10.4.73.197 – 10.4.73.198	10.4.73.199
115	10.4.73.200/30	10.4.73.201 – 10.4.73.202	10.4.73.203
116	10.4.73.204/30	10.4.73.205 – 10.4.73.206	10.4.73.207
117	10.4.73.208/30	10.4.73.209 – 10.4.73.210	10.4.73.211
118	10.4.73.212/30	10.4.73.213 – 10.4.73.214	10.4.73.215
119	10.4.73.216/30	10.4.73.217 – 10.4.73.218	10.4.73.219
120	10.4.73.220/30	10.4.73.221 – 10.4.73.222	10.4.73.223
121	10.4.73.224/30	10.4.73.225 – 10.4.73.226	10.4.73.227
122	10.4.73.228/30	10.4.73.229 – 10.4.73.230	10.4.73.231
123	10.4.73.232/30	10.4.73.233 – 10.4.73.234	10.4.73.235
124	10.4.73.236/30	10.4.73.237 – 10.4.73.238	10.4.73.239
125	10.4.73.240/30	10.4.73.241 – 10.4.73.242	10.4.73.243
126	10.4.73.244/30	10.4.73.245 – 10.4.73.246	10.4.73.247
127	10.4.73.248/30	10.4.73.249 – 10.4.73.250	10.4.73.251
128	10.4.73.252/30	10.4.73.253 – 10.4.73.254	10.4.73.255
129	10.4.74.0/30	10.4.74.1 – 10.4.74.2	10.4.74.3
130	10.4.74.4/30	10.4.74.5 – 10.4.74.6	10.4.74.7
131	10.4.74.8/30	10.4.74.9 – 10.4.74.10	10.4.74.11
132	10.4.74.12/30	10.4.74.13 – 10.4.74.14	10.4.74.15
133	10.4.74.16/30	10.4.74.17 – 10.4.74.18	10.4.74.19
134	10.4.74.20/30	10.4.74.21 – 10.4.74.22	10.4.74.23
135	10.4.74.24/30	10.4.74.25 – 10.4.74.26	10.4.74.27
136	10.4.74.28/30	10.4.74.29 – 10.4.74.30	10.4.74.31
137	10.4.74.32/30	10.4.74.33 – 10.4.74.34	10.4.74.35
138	10.4.74.36/30	10.4.74.37 – 10.4.74.38	10.4.74.39
139	10.4.74.40/30	10.4.74.41 – 10.4.74.42	10.4.74.43
140	10.4.74.44/30	10.4.74.45 – 10.4.74.46	10.4.74.47
141	10.4.74.48/30	10.4.74.49 – 10.4.74.50	10.4.74.51
142	10.4.74.52/30	10.4.74.53 – 10.4.74.54	10.4.74.55
143	10.4.74.56/30	10.4.74.57 – 10.4.74.58	10.4.74.59
144	10.4.74.60/30	10.4.74.61 – 10.4.74.62	10.4.74.63
145	10.4.74.64/30	10.4.74.65 – 10.4.74.66	10.4.74.67
146	10.4.74.68/30	10.4.74.69 – 10.4.74.70	10.4.74.71
147	10.4.74.72/30	10.4.74.73 – 10.4.74.74	10.4.74.75
148	10.4.74.76/30	10.4.74.77 – 10.4.74.78	10.4.74.79
149	10.4.74.80/30	10.4.74.81 – 10.4.74.82	10.4.74.83
150	10.4.74.84/30	10.4.74.85 – 10.4.74.86	10.4.74.87
151	10.4.74.88/30	10.4.74.89 – 10.4.74.90	10.4.74.91
152	10.4.74.92/30	10.4.74.93 – 10.4.74.94	10.4.74.95
153	10.4.74.96/30	10.4.74.97 – 10.4.74.98	10.4.74.99
154	10.4.74.100/30	10.4.74.101 – 10.4.74.102	10.4.74.103
155	10.4.74.104/30	10.4.74.105 – 10.4.74.106	10.4.74.107
156	10.4.74.108/30	10.4.74.109 – 10.4.74.110	10.4.74.111
157	10.4.74.112/30	10.4.74.113 – 10.4.74.114	10.4.74.115
158	10.4.74.116/30	10.4.74.117 – 10.4.74.118	10.4.74.119
159	10.4.74.120/30	10.4.74.121 – 10.4.74.122	10.4.74.123
160	10.4.74.124/30	10.4.74.125 – 10.4.74.126	10.4.74.127
161	10.4.74.128/30	10.4.74.129 – 10.4.74.130	10.4.74.131
162	10.4.74.132/30	10.4.74.133 – 10.4.74.134	10.4.74.135
163	10.4.74.136/30	10.4.74.137 – 10.4.74.138	10.4.74.139
164	10.4.74.140/30	10.4.74.141 – 10.4.74.142	10.4.74.143
165	10.4.74.144/30	10.4.74.145 – 10.4.74.146	10.4.74.147
166	10.4.74.148/30	10.4.74.149 – 10.4.74.150	10.4.74.151
167	10.4.74.152/30	10.4.74.153 – 10.4.74.154	10.4.74.155
168	10.4.74.156/30	10.4.74.157 – 10.4.74.158	10.4.74.159
169	10.4.74.160/30	10.4.74.161 – 10.4.74.162	10.4.74.163
170	10.4.74.164/30	10.4.74.165 – 10.4.74.166	10.4.74.167
171	10.4.74.168/30	10.4.74.169 – 10.4.74.170	10.4.74.171
172	10.4.74.172/30	10.4.74.173 – 10.4.74.174	10.4.74.175
173	10.4.74.176/30	10.4.74.177 – 10.4.74.178	10.4.74.179
174	10.4.74.180/30	10.4.74.181 – 10.4.74.182	10.4.74.183
175	10.4.74.184/30	10.4.74.185 – 10.4.74.186	10.4.74.187
176	10.4.74.188/30	10.4.74.189 – 10.4.74.190	10.4.74.191
177	10.4.74.192/30	10.4.74.193 – 10.4.74.194	10.4.74.195
178	10.4.74.196/30	10.4.74.197 – 10.4.74.198	10.4.74.199
179	10.4.74.200/30	10.4.74.201 – 10.4.74.202	10.4.74.203
180	10.4.74.204/30	10.4.74.205 – 10.4.74.206	10.4.74.207
181	10.4.74.208/30	10.4.74.209 – 10.4.74.210	10.4.74.211
182	10.4.74.212/30	10.4.74.213 – 10.4.74.214	10.4.74.215
183	10.4.74.216/30	10.4.74.217 – 10.4.74.218	10.4.74.219
184	10.4.74.220/30	10.4.74.221 – 10.4.74.222	10.4.74.223
185	10.4.74.224/30	10.4.74.225 – 10.4.74.226	10.4.74.227
186	10.4.74.228/30	10.4.74.229 – 10.4.74.230	10.4.74.231
187	10.4.74.232/30	10.4.74.233 – 10.4.74.234	10.4.74.235
188	10.4.74.236/30	10.4.74.237 – 10.4.74.238	10.4.74.239
189	10.4.74.240/30	10.4.74.241 – 10.4.74.242	10.4.74.243
190	10.4.74.244/30	10.4.74.245 – 10.4.74.246	10.4.74.247
191	10.4.74.248/30	10.4.74.249 – 10.4.74.250	10.4.74.251
192	10.4.74.252/30	10.4.74.253 – 10.4.74.254	10.4.74.255
193	10.4.75.0/30	10.4.75.1 – 10.4.75.2	10.4.75.3
194	10.4.75.4/30	10.4.75.5 – 10.4.75.6	10.4.75.7
195	10.4.75.8/30	10.4.75.9 – 10.4.75.10	10.4.75.11
196	10.4.75.12/30	10.4.75.13 – 10.4.75.14	10.4.75.15
197	10.4.75.16/30	10.4.75.17 – 10.4.75.18	10.4.75.19
198	10.4.75.20/30	10.4.75.21 – 10.4.75.22	10.4.75.23
199	10.4.75.24/30	10.4.75.25 – 10.4.75.26	10.4.75.27
200	10.4.75.28/30	10.4.75.29 – 10.4.75.30	10.4.75.31
201	10.4.75.32/30	10.4.75.33 – 10.4.75.34	10.4.75.35
202	10.4.75.36/30	10.4.75.37 – 10.4.75.38	10.4.75.39
203	10.4.75.40/30	10.4.75.41 – 10.4.75.42	10.4.75.43
204	10.4.75.44/30	10.4.75.45 – 10.4.75.46	10.4.75.47
205	10.4.75.48/30	10.4.75.49 – 10.4.75.50	10.4.75.51
206	10.4.75.52/30	10.4.75.53 – 10.4.75.54	10.4.75.55
207	10.4.75.56/30	10.4.75.57 – 10.4.75.58	10.4.75.59
208	10.4.75.60/30	10.4.75.61 – 10.4.75.62	10.4.75.63
209	10.4.75.64/30	10.4.75.65 – 10.4.75.66	10.4.75.67
210	10.4.75.68/30	10.4.75.69 – 10.4.75.70	10.4.75.71
211	10.4.75.72/30	10.4.75.73 – 10.4.75.74	10.4.75.75
212	10.4.75.76/30	10.4.75.77 – 10.4.75.78	10.4.75.79
213	10.4.75.80/30	10.4.75.81 – 10.4.75.82	10.4.75.83
214	10.4.75.84/30	10.4.75.85 – 10.4.75.86	10.4.75.87
215	10.4.75.88/30	10.4.75.89 – 10.4.75.90	10.4.75.91
216	10.4.75.92/30	10.4.75.93 – 10.4.75.94	10.4.75.95
217	10.4.75.96/30	10.4.75.97 – 10.4.75.98	10.4.75.99
218	10.4.75.100/30	10.4.75.101 – 10.4.75.102	10.4.75.103
219	10.4.75.104/30	10.4.75.105 – 10.4.75.106	10.4.75.107
220	10.4.75.108/30	10.4.75.109 – 10.4.75.110	10.4.75.111
221	10.4.75.112/30	10.4.75.113 – 10.4.75.114	10.4.75.115
222	10.4.75.116/30	10.4.75.117 – 10.4.75.118	10.4.75.119
223	10.4.75.120/30	10.4.75.121 – 10.4.75.122	10.4.75.123
224	10.4.75.124/30	10.4.75.125 – 10.4.75.126	10.4.75.127
225	10.4.75.128/30	10.4.75.129 – 10.4.75.130	10.4.75.131
226	10.4.75.132/30	10.4.75.133 – 10.4.75.134	10.4.75.135
227	10.4.75.136/30	10.4.75.137 – 10.4.75.138	10.4.75.139
228	10.4.75.140/30	10.4.75.141 – 10.4.75.142	10.4.75.143
229	10.4.75.144/30	10.4.75.145 – 10.4.75.146	10.4.75.147
230	10.4.75.148/30	10.4.75.149 – 10.4.75.150	10.4.75.151
231	10.4.75.152/30	10.4.75.153 – 10.4.75.154	10.4.75.155
232	10.4.75.156/30	10.4.75.157 – 10.4.75.158	10.4.75.159
233	10.4.75.160/30	10.4.75.161 – 10.4.75.162	10.4.75.163
234	10.4.75.164/30	10.4.75.165 – 10.4.75.166	10.4.75.167
235	10.4.75.168/30	10.4.75.169 – 10.4.75.170	10.4.75.171
236	10.4.75.172/30	10.4.75.173 – 10.4.75.174	10.4.75.175
237	10.4.75.176/30	10.4.75.177 – 10.4.75.178	10.4.75.179
238	10.4.75.180/30	10.4.75.181 – 10.4.75.182	10.4.75.183
239	10.4.75.184/30	10.4.75.185 – 10.4.75.186	10.4.75.187
240	10.4.75.188/30	10.4.75.189 – 10.4.75.190	10.4.75.191
241	10.4.75.192/30	10.4.75.193 – 10.4.75.194	10.4.75.195
242	10.4.75.196/30	10.4.75.197 – 10.4.75.198	10.4.75.199
243	10.4.75.200/30	10.4.75.201 – 10.4.75.202	10.4.75.203
244	10.4.75.204/30	10.4.75.205 – 10.4.75.206	10.4.75.207
245	10.4.75.208/30	10.4.75.209 – 10.4.75.210	10.4.75.211
246	10.4.75.212/30	10.4.75.213 – 10.4.75.214	10.4.75.215
247	10.4.75.216/30	10.4.75.217 – 10.4.75.218	10.4.75.219
248	10.4.75.220/30	10.4.75.221 – 10.4.75.222	10.4.75.223
249	10.4.75.224/30	10.4.75.225 – 10.4.75.226	10.4.75.227
250	10.4.75.228/30	10.4.75.229 – 10.4.75.230	10.4.75.231
251	10.4.75.232/30	10.4.75.233 – 10.4.75.234	10.4.75.235
252	10.4.75.236/30	10.4.75.237 – 10.4.75.238	10.4.75.239
253	10.4.75.240/30	10.4.75.241 – 10.4.75.242	10.4.75.243
254	10.4.75.244/30	10.4.75.245 – 10.4.75.246	10.4.75.247
255	10.4.75.248/30	10.4.75.249 – 10.4.75.250	10.4.75.251
256	10.4.75.252/30	10.4.75.253 – 10.4.75.254	10.4.75.255

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 →