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)10.12.144.0/20

network10.12.144.0/20

broadcast10.12.159.255

first host10.12.144.1

last host10.12.159.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.12.144.0/20

address00001010.00001100.10010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00001100.10010000.00000000

broadcast00001010.00001100.10011111.11111111

green = network part, grey = host part

hex0x0a0c9000

decimal168595456

reverse dns0.144.12.10.in-addr.arpa

ipv4-mapped::ffff:a0c:9000

/20 split into /30 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.12.144.0/30	10.12.144.1 – 10.12.144.2	10.12.144.3
2	10.12.144.4/30	10.12.144.5 – 10.12.144.6	10.12.144.7
3	10.12.144.8/30	10.12.144.9 – 10.12.144.10	10.12.144.11
4	10.12.144.12/30	10.12.144.13 – 10.12.144.14	10.12.144.15
5	10.12.144.16/30	10.12.144.17 – 10.12.144.18	10.12.144.19
6	10.12.144.20/30	10.12.144.21 – 10.12.144.22	10.12.144.23
7	10.12.144.24/30	10.12.144.25 – 10.12.144.26	10.12.144.27
8	10.12.144.28/30	10.12.144.29 – 10.12.144.30	10.12.144.31
9	10.12.144.32/30	10.12.144.33 – 10.12.144.34	10.12.144.35
10	10.12.144.36/30	10.12.144.37 – 10.12.144.38	10.12.144.39
11	10.12.144.40/30	10.12.144.41 – 10.12.144.42	10.12.144.43
12	10.12.144.44/30	10.12.144.45 – 10.12.144.46	10.12.144.47
13	10.12.144.48/30	10.12.144.49 – 10.12.144.50	10.12.144.51
14	10.12.144.52/30	10.12.144.53 – 10.12.144.54	10.12.144.55
15	10.12.144.56/30	10.12.144.57 – 10.12.144.58	10.12.144.59
16	10.12.144.60/30	10.12.144.61 – 10.12.144.62	10.12.144.63
17	10.12.144.64/30	10.12.144.65 – 10.12.144.66	10.12.144.67
18	10.12.144.68/30	10.12.144.69 – 10.12.144.70	10.12.144.71
19	10.12.144.72/30	10.12.144.73 – 10.12.144.74	10.12.144.75
20	10.12.144.76/30	10.12.144.77 – 10.12.144.78	10.12.144.79
21	10.12.144.80/30	10.12.144.81 – 10.12.144.82	10.12.144.83
22	10.12.144.84/30	10.12.144.85 – 10.12.144.86	10.12.144.87
23	10.12.144.88/30	10.12.144.89 – 10.12.144.90	10.12.144.91
24	10.12.144.92/30	10.12.144.93 – 10.12.144.94	10.12.144.95
25	10.12.144.96/30	10.12.144.97 – 10.12.144.98	10.12.144.99
26	10.12.144.100/30	10.12.144.101 – 10.12.144.102	10.12.144.103
27	10.12.144.104/30	10.12.144.105 – 10.12.144.106	10.12.144.107
28	10.12.144.108/30	10.12.144.109 – 10.12.144.110	10.12.144.111
29	10.12.144.112/30	10.12.144.113 – 10.12.144.114	10.12.144.115
30	10.12.144.116/30	10.12.144.117 – 10.12.144.118	10.12.144.119
31	10.12.144.120/30	10.12.144.121 – 10.12.144.122	10.12.144.123
32	10.12.144.124/30	10.12.144.125 – 10.12.144.126	10.12.144.127
33	10.12.144.128/30	10.12.144.129 – 10.12.144.130	10.12.144.131
34	10.12.144.132/30	10.12.144.133 – 10.12.144.134	10.12.144.135
35	10.12.144.136/30	10.12.144.137 – 10.12.144.138	10.12.144.139
36	10.12.144.140/30	10.12.144.141 – 10.12.144.142	10.12.144.143
37	10.12.144.144/30	10.12.144.145 – 10.12.144.146	10.12.144.147
38	10.12.144.148/30	10.12.144.149 – 10.12.144.150	10.12.144.151
39	10.12.144.152/30	10.12.144.153 – 10.12.144.154	10.12.144.155
40	10.12.144.156/30	10.12.144.157 – 10.12.144.158	10.12.144.159
41	10.12.144.160/30	10.12.144.161 – 10.12.144.162	10.12.144.163
42	10.12.144.164/30	10.12.144.165 – 10.12.144.166	10.12.144.167
43	10.12.144.168/30	10.12.144.169 – 10.12.144.170	10.12.144.171
44	10.12.144.172/30	10.12.144.173 – 10.12.144.174	10.12.144.175
45	10.12.144.176/30	10.12.144.177 – 10.12.144.178	10.12.144.179
46	10.12.144.180/30	10.12.144.181 – 10.12.144.182	10.12.144.183
47	10.12.144.184/30	10.12.144.185 – 10.12.144.186	10.12.144.187
48	10.12.144.188/30	10.12.144.189 – 10.12.144.190	10.12.144.191
49	10.12.144.192/30	10.12.144.193 – 10.12.144.194	10.12.144.195
50	10.12.144.196/30	10.12.144.197 – 10.12.144.198	10.12.144.199
51	10.12.144.200/30	10.12.144.201 – 10.12.144.202	10.12.144.203
52	10.12.144.204/30	10.12.144.205 – 10.12.144.206	10.12.144.207
53	10.12.144.208/30	10.12.144.209 – 10.12.144.210	10.12.144.211
54	10.12.144.212/30	10.12.144.213 – 10.12.144.214	10.12.144.215
55	10.12.144.216/30	10.12.144.217 – 10.12.144.218	10.12.144.219
56	10.12.144.220/30	10.12.144.221 – 10.12.144.222	10.12.144.223
57	10.12.144.224/30	10.12.144.225 – 10.12.144.226	10.12.144.227
58	10.12.144.228/30	10.12.144.229 – 10.12.144.230	10.12.144.231
59	10.12.144.232/30	10.12.144.233 – 10.12.144.234	10.12.144.235
60	10.12.144.236/30	10.12.144.237 – 10.12.144.238	10.12.144.239
61	10.12.144.240/30	10.12.144.241 – 10.12.144.242	10.12.144.243
62	10.12.144.244/30	10.12.144.245 – 10.12.144.246	10.12.144.247
63	10.12.144.248/30	10.12.144.249 – 10.12.144.250	10.12.144.251
64	10.12.144.252/30	10.12.144.253 – 10.12.144.254	10.12.144.255
65	10.12.145.0/30	10.12.145.1 – 10.12.145.2	10.12.145.3
66	10.12.145.4/30	10.12.145.5 – 10.12.145.6	10.12.145.7
67	10.12.145.8/30	10.12.145.9 – 10.12.145.10	10.12.145.11
68	10.12.145.12/30	10.12.145.13 – 10.12.145.14	10.12.145.15
69	10.12.145.16/30	10.12.145.17 – 10.12.145.18	10.12.145.19
70	10.12.145.20/30	10.12.145.21 – 10.12.145.22	10.12.145.23
71	10.12.145.24/30	10.12.145.25 – 10.12.145.26	10.12.145.27
72	10.12.145.28/30	10.12.145.29 – 10.12.145.30	10.12.145.31
73	10.12.145.32/30	10.12.145.33 – 10.12.145.34	10.12.145.35
74	10.12.145.36/30	10.12.145.37 – 10.12.145.38	10.12.145.39
75	10.12.145.40/30	10.12.145.41 – 10.12.145.42	10.12.145.43
76	10.12.145.44/30	10.12.145.45 – 10.12.145.46	10.12.145.47
77	10.12.145.48/30	10.12.145.49 – 10.12.145.50	10.12.145.51
78	10.12.145.52/30	10.12.145.53 – 10.12.145.54	10.12.145.55
79	10.12.145.56/30	10.12.145.57 – 10.12.145.58	10.12.145.59
80	10.12.145.60/30	10.12.145.61 – 10.12.145.62	10.12.145.63
81	10.12.145.64/30	10.12.145.65 – 10.12.145.66	10.12.145.67
82	10.12.145.68/30	10.12.145.69 – 10.12.145.70	10.12.145.71
83	10.12.145.72/30	10.12.145.73 – 10.12.145.74	10.12.145.75
84	10.12.145.76/30	10.12.145.77 – 10.12.145.78	10.12.145.79
85	10.12.145.80/30	10.12.145.81 – 10.12.145.82	10.12.145.83
86	10.12.145.84/30	10.12.145.85 – 10.12.145.86	10.12.145.87
87	10.12.145.88/30	10.12.145.89 – 10.12.145.90	10.12.145.91
88	10.12.145.92/30	10.12.145.93 – 10.12.145.94	10.12.145.95
89	10.12.145.96/30	10.12.145.97 – 10.12.145.98	10.12.145.99
90	10.12.145.100/30	10.12.145.101 – 10.12.145.102	10.12.145.103
91	10.12.145.104/30	10.12.145.105 – 10.12.145.106	10.12.145.107
92	10.12.145.108/30	10.12.145.109 – 10.12.145.110	10.12.145.111
93	10.12.145.112/30	10.12.145.113 – 10.12.145.114	10.12.145.115
94	10.12.145.116/30	10.12.145.117 – 10.12.145.118	10.12.145.119
95	10.12.145.120/30	10.12.145.121 – 10.12.145.122	10.12.145.123
96	10.12.145.124/30	10.12.145.125 – 10.12.145.126	10.12.145.127
97	10.12.145.128/30	10.12.145.129 – 10.12.145.130	10.12.145.131
98	10.12.145.132/30	10.12.145.133 – 10.12.145.134	10.12.145.135
99	10.12.145.136/30	10.12.145.137 – 10.12.145.138	10.12.145.139
100	10.12.145.140/30	10.12.145.141 – 10.12.145.142	10.12.145.143
101	10.12.145.144/30	10.12.145.145 – 10.12.145.146	10.12.145.147
102	10.12.145.148/30	10.12.145.149 – 10.12.145.150	10.12.145.151
103	10.12.145.152/30	10.12.145.153 – 10.12.145.154	10.12.145.155
104	10.12.145.156/30	10.12.145.157 – 10.12.145.158	10.12.145.159
105	10.12.145.160/30	10.12.145.161 – 10.12.145.162	10.12.145.163
106	10.12.145.164/30	10.12.145.165 – 10.12.145.166	10.12.145.167
107	10.12.145.168/30	10.12.145.169 – 10.12.145.170	10.12.145.171
108	10.12.145.172/30	10.12.145.173 – 10.12.145.174	10.12.145.175
109	10.12.145.176/30	10.12.145.177 – 10.12.145.178	10.12.145.179
110	10.12.145.180/30	10.12.145.181 – 10.12.145.182	10.12.145.183
111	10.12.145.184/30	10.12.145.185 – 10.12.145.186	10.12.145.187
112	10.12.145.188/30	10.12.145.189 – 10.12.145.190	10.12.145.191
113	10.12.145.192/30	10.12.145.193 – 10.12.145.194	10.12.145.195
114	10.12.145.196/30	10.12.145.197 – 10.12.145.198	10.12.145.199
115	10.12.145.200/30	10.12.145.201 – 10.12.145.202	10.12.145.203
116	10.12.145.204/30	10.12.145.205 – 10.12.145.206	10.12.145.207
117	10.12.145.208/30	10.12.145.209 – 10.12.145.210	10.12.145.211
118	10.12.145.212/30	10.12.145.213 – 10.12.145.214	10.12.145.215
119	10.12.145.216/30	10.12.145.217 – 10.12.145.218	10.12.145.219
120	10.12.145.220/30	10.12.145.221 – 10.12.145.222	10.12.145.223
121	10.12.145.224/30	10.12.145.225 – 10.12.145.226	10.12.145.227
122	10.12.145.228/30	10.12.145.229 – 10.12.145.230	10.12.145.231
123	10.12.145.232/30	10.12.145.233 – 10.12.145.234	10.12.145.235
124	10.12.145.236/30	10.12.145.237 – 10.12.145.238	10.12.145.239
125	10.12.145.240/30	10.12.145.241 – 10.12.145.242	10.12.145.243
126	10.12.145.244/30	10.12.145.245 – 10.12.145.246	10.12.145.247
127	10.12.145.248/30	10.12.145.249 – 10.12.145.250	10.12.145.251
128	10.12.145.252/30	10.12.145.253 – 10.12.145.254	10.12.145.255
129	10.12.146.0/30	10.12.146.1 – 10.12.146.2	10.12.146.3
130	10.12.146.4/30	10.12.146.5 – 10.12.146.6	10.12.146.7
131	10.12.146.8/30	10.12.146.9 – 10.12.146.10	10.12.146.11
132	10.12.146.12/30	10.12.146.13 – 10.12.146.14	10.12.146.15
133	10.12.146.16/30	10.12.146.17 – 10.12.146.18	10.12.146.19
134	10.12.146.20/30	10.12.146.21 – 10.12.146.22	10.12.146.23
135	10.12.146.24/30	10.12.146.25 – 10.12.146.26	10.12.146.27
136	10.12.146.28/30	10.12.146.29 – 10.12.146.30	10.12.146.31
137	10.12.146.32/30	10.12.146.33 – 10.12.146.34	10.12.146.35
138	10.12.146.36/30	10.12.146.37 – 10.12.146.38	10.12.146.39
139	10.12.146.40/30	10.12.146.41 – 10.12.146.42	10.12.146.43
140	10.12.146.44/30	10.12.146.45 – 10.12.146.46	10.12.146.47
141	10.12.146.48/30	10.12.146.49 – 10.12.146.50	10.12.146.51
142	10.12.146.52/30	10.12.146.53 – 10.12.146.54	10.12.146.55
143	10.12.146.56/30	10.12.146.57 – 10.12.146.58	10.12.146.59
144	10.12.146.60/30	10.12.146.61 – 10.12.146.62	10.12.146.63
145	10.12.146.64/30	10.12.146.65 – 10.12.146.66	10.12.146.67
146	10.12.146.68/30	10.12.146.69 – 10.12.146.70	10.12.146.71
147	10.12.146.72/30	10.12.146.73 – 10.12.146.74	10.12.146.75
148	10.12.146.76/30	10.12.146.77 – 10.12.146.78	10.12.146.79
149	10.12.146.80/30	10.12.146.81 – 10.12.146.82	10.12.146.83
150	10.12.146.84/30	10.12.146.85 – 10.12.146.86	10.12.146.87
151	10.12.146.88/30	10.12.146.89 – 10.12.146.90	10.12.146.91
152	10.12.146.92/30	10.12.146.93 – 10.12.146.94	10.12.146.95
153	10.12.146.96/30	10.12.146.97 – 10.12.146.98	10.12.146.99
154	10.12.146.100/30	10.12.146.101 – 10.12.146.102	10.12.146.103
155	10.12.146.104/30	10.12.146.105 – 10.12.146.106	10.12.146.107
156	10.12.146.108/30	10.12.146.109 – 10.12.146.110	10.12.146.111
157	10.12.146.112/30	10.12.146.113 – 10.12.146.114	10.12.146.115
158	10.12.146.116/30	10.12.146.117 – 10.12.146.118	10.12.146.119
159	10.12.146.120/30	10.12.146.121 – 10.12.146.122	10.12.146.123
160	10.12.146.124/30	10.12.146.125 – 10.12.146.126	10.12.146.127
161	10.12.146.128/30	10.12.146.129 – 10.12.146.130	10.12.146.131
162	10.12.146.132/30	10.12.146.133 – 10.12.146.134	10.12.146.135
163	10.12.146.136/30	10.12.146.137 – 10.12.146.138	10.12.146.139
164	10.12.146.140/30	10.12.146.141 – 10.12.146.142	10.12.146.143
165	10.12.146.144/30	10.12.146.145 – 10.12.146.146	10.12.146.147
166	10.12.146.148/30	10.12.146.149 – 10.12.146.150	10.12.146.151
167	10.12.146.152/30	10.12.146.153 – 10.12.146.154	10.12.146.155
168	10.12.146.156/30	10.12.146.157 – 10.12.146.158	10.12.146.159
169	10.12.146.160/30	10.12.146.161 – 10.12.146.162	10.12.146.163
170	10.12.146.164/30	10.12.146.165 – 10.12.146.166	10.12.146.167
171	10.12.146.168/30	10.12.146.169 – 10.12.146.170	10.12.146.171
172	10.12.146.172/30	10.12.146.173 – 10.12.146.174	10.12.146.175
173	10.12.146.176/30	10.12.146.177 – 10.12.146.178	10.12.146.179
174	10.12.146.180/30	10.12.146.181 – 10.12.146.182	10.12.146.183
175	10.12.146.184/30	10.12.146.185 – 10.12.146.186	10.12.146.187
176	10.12.146.188/30	10.12.146.189 – 10.12.146.190	10.12.146.191
177	10.12.146.192/30	10.12.146.193 – 10.12.146.194	10.12.146.195
178	10.12.146.196/30	10.12.146.197 – 10.12.146.198	10.12.146.199
179	10.12.146.200/30	10.12.146.201 – 10.12.146.202	10.12.146.203
180	10.12.146.204/30	10.12.146.205 – 10.12.146.206	10.12.146.207
181	10.12.146.208/30	10.12.146.209 – 10.12.146.210	10.12.146.211
182	10.12.146.212/30	10.12.146.213 – 10.12.146.214	10.12.146.215
183	10.12.146.216/30	10.12.146.217 – 10.12.146.218	10.12.146.219
184	10.12.146.220/30	10.12.146.221 – 10.12.146.222	10.12.146.223
185	10.12.146.224/30	10.12.146.225 – 10.12.146.226	10.12.146.227
186	10.12.146.228/30	10.12.146.229 – 10.12.146.230	10.12.146.231
187	10.12.146.232/30	10.12.146.233 – 10.12.146.234	10.12.146.235
188	10.12.146.236/30	10.12.146.237 – 10.12.146.238	10.12.146.239
189	10.12.146.240/30	10.12.146.241 – 10.12.146.242	10.12.146.243
190	10.12.146.244/30	10.12.146.245 – 10.12.146.246	10.12.146.247
191	10.12.146.248/30	10.12.146.249 – 10.12.146.250	10.12.146.251
192	10.12.146.252/30	10.12.146.253 – 10.12.146.254	10.12.146.255
193	10.12.147.0/30	10.12.147.1 – 10.12.147.2	10.12.147.3
194	10.12.147.4/30	10.12.147.5 – 10.12.147.6	10.12.147.7
195	10.12.147.8/30	10.12.147.9 – 10.12.147.10	10.12.147.11
196	10.12.147.12/30	10.12.147.13 – 10.12.147.14	10.12.147.15
197	10.12.147.16/30	10.12.147.17 – 10.12.147.18	10.12.147.19
198	10.12.147.20/30	10.12.147.21 – 10.12.147.22	10.12.147.23
199	10.12.147.24/30	10.12.147.25 – 10.12.147.26	10.12.147.27
200	10.12.147.28/30	10.12.147.29 – 10.12.147.30	10.12.147.31
201	10.12.147.32/30	10.12.147.33 – 10.12.147.34	10.12.147.35
202	10.12.147.36/30	10.12.147.37 – 10.12.147.38	10.12.147.39
203	10.12.147.40/30	10.12.147.41 – 10.12.147.42	10.12.147.43
204	10.12.147.44/30	10.12.147.45 – 10.12.147.46	10.12.147.47
205	10.12.147.48/30	10.12.147.49 – 10.12.147.50	10.12.147.51
206	10.12.147.52/30	10.12.147.53 – 10.12.147.54	10.12.147.55
207	10.12.147.56/30	10.12.147.57 – 10.12.147.58	10.12.147.59
208	10.12.147.60/30	10.12.147.61 – 10.12.147.62	10.12.147.63
209	10.12.147.64/30	10.12.147.65 – 10.12.147.66	10.12.147.67
210	10.12.147.68/30	10.12.147.69 – 10.12.147.70	10.12.147.71
211	10.12.147.72/30	10.12.147.73 – 10.12.147.74	10.12.147.75
212	10.12.147.76/30	10.12.147.77 – 10.12.147.78	10.12.147.79
213	10.12.147.80/30	10.12.147.81 – 10.12.147.82	10.12.147.83
214	10.12.147.84/30	10.12.147.85 – 10.12.147.86	10.12.147.87
215	10.12.147.88/30	10.12.147.89 – 10.12.147.90	10.12.147.91
216	10.12.147.92/30	10.12.147.93 – 10.12.147.94	10.12.147.95
217	10.12.147.96/30	10.12.147.97 – 10.12.147.98	10.12.147.99
218	10.12.147.100/30	10.12.147.101 – 10.12.147.102	10.12.147.103
219	10.12.147.104/30	10.12.147.105 – 10.12.147.106	10.12.147.107
220	10.12.147.108/30	10.12.147.109 – 10.12.147.110	10.12.147.111
221	10.12.147.112/30	10.12.147.113 – 10.12.147.114	10.12.147.115
222	10.12.147.116/30	10.12.147.117 – 10.12.147.118	10.12.147.119
223	10.12.147.120/30	10.12.147.121 – 10.12.147.122	10.12.147.123
224	10.12.147.124/30	10.12.147.125 – 10.12.147.126	10.12.147.127
225	10.12.147.128/30	10.12.147.129 – 10.12.147.130	10.12.147.131
226	10.12.147.132/30	10.12.147.133 – 10.12.147.134	10.12.147.135
227	10.12.147.136/30	10.12.147.137 – 10.12.147.138	10.12.147.139
228	10.12.147.140/30	10.12.147.141 – 10.12.147.142	10.12.147.143
229	10.12.147.144/30	10.12.147.145 – 10.12.147.146	10.12.147.147
230	10.12.147.148/30	10.12.147.149 – 10.12.147.150	10.12.147.151
231	10.12.147.152/30	10.12.147.153 – 10.12.147.154	10.12.147.155
232	10.12.147.156/30	10.12.147.157 – 10.12.147.158	10.12.147.159
233	10.12.147.160/30	10.12.147.161 – 10.12.147.162	10.12.147.163
234	10.12.147.164/30	10.12.147.165 – 10.12.147.166	10.12.147.167
235	10.12.147.168/30	10.12.147.169 – 10.12.147.170	10.12.147.171
236	10.12.147.172/30	10.12.147.173 – 10.12.147.174	10.12.147.175
237	10.12.147.176/30	10.12.147.177 – 10.12.147.178	10.12.147.179
238	10.12.147.180/30	10.12.147.181 – 10.12.147.182	10.12.147.183
239	10.12.147.184/30	10.12.147.185 – 10.12.147.186	10.12.147.187
240	10.12.147.188/30	10.12.147.189 – 10.12.147.190	10.12.147.191
241	10.12.147.192/30	10.12.147.193 – 10.12.147.194	10.12.147.195
242	10.12.147.196/30	10.12.147.197 – 10.12.147.198	10.12.147.199
243	10.12.147.200/30	10.12.147.201 – 10.12.147.202	10.12.147.203
244	10.12.147.204/30	10.12.147.205 – 10.12.147.206	10.12.147.207
245	10.12.147.208/30	10.12.147.209 – 10.12.147.210	10.12.147.211
246	10.12.147.212/30	10.12.147.213 – 10.12.147.214	10.12.147.215
247	10.12.147.216/30	10.12.147.217 – 10.12.147.218	10.12.147.219
248	10.12.147.220/30	10.12.147.221 – 10.12.147.222	10.12.147.223
249	10.12.147.224/30	10.12.147.225 – 10.12.147.226	10.12.147.227
250	10.12.147.228/30	10.12.147.229 – 10.12.147.230	10.12.147.231
251	10.12.147.232/30	10.12.147.233 – 10.12.147.234	10.12.147.235
252	10.12.147.236/30	10.12.147.237 – 10.12.147.238	10.12.147.239
253	10.12.147.240/30	10.12.147.241 – 10.12.147.242	10.12.147.243
254	10.12.147.244/30	10.12.147.245 – 10.12.147.246	10.12.147.247
255	10.12.147.248/30	10.12.147.249 – 10.12.147.250	10.12.147.251
256	10.12.147.252/30	10.12.147.253 – 10.12.147.254	10.12.147.255

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 →