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)10.31.128.0/18

network10.31.128.0/18

broadcast10.31.191.255

first host10.31.128.1

last host10.31.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.31.128.0/18

address00001010.00011111.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00011111.10000000.00000000

broadcast00001010.00011111.10111111.11111111

green = network part, grey = host part

hex0x0a1f8000

decimal169836544

reverse dns0.128.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:8000

/18 split into /30 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.31.128.0/30	10.31.128.1 – 10.31.128.2	10.31.128.3
2	10.31.128.4/30	10.31.128.5 – 10.31.128.6	10.31.128.7
3	10.31.128.8/30	10.31.128.9 – 10.31.128.10	10.31.128.11
4	10.31.128.12/30	10.31.128.13 – 10.31.128.14	10.31.128.15
5	10.31.128.16/30	10.31.128.17 – 10.31.128.18	10.31.128.19
6	10.31.128.20/30	10.31.128.21 – 10.31.128.22	10.31.128.23
7	10.31.128.24/30	10.31.128.25 – 10.31.128.26	10.31.128.27
8	10.31.128.28/30	10.31.128.29 – 10.31.128.30	10.31.128.31
9	10.31.128.32/30	10.31.128.33 – 10.31.128.34	10.31.128.35
10	10.31.128.36/30	10.31.128.37 – 10.31.128.38	10.31.128.39
11	10.31.128.40/30	10.31.128.41 – 10.31.128.42	10.31.128.43
12	10.31.128.44/30	10.31.128.45 – 10.31.128.46	10.31.128.47
13	10.31.128.48/30	10.31.128.49 – 10.31.128.50	10.31.128.51
14	10.31.128.52/30	10.31.128.53 – 10.31.128.54	10.31.128.55
15	10.31.128.56/30	10.31.128.57 – 10.31.128.58	10.31.128.59
16	10.31.128.60/30	10.31.128.61 – 10.31.128.62	10.31.128.63
17	10.31.128.64/30	10.31.128.65 – 10.31.128.66	10.31.128.67
18	10.31.128.68/30	10.31.128.69 – 10.31.128.70	10.31.128.71
19	10.31.128.72/30	10.31.128.73 – 10.31.128.74	10.31.128.75
20	10.31.128.76/30	10.31.128.77 – 10.31.128.78	10.31.128.79
21	10.31.128.80/30	10.31.128.81 – 10.31.128.82	10.31.128.83
22	10.31.128.84/30	10.31.128.85 – 10.31.128.86	10.31.128.87
23	10.31.128.88/30	10.31.128.89 – 10.31.128.90	10.31.128.91
24	10.31.128.92/30	10.31.128.93 – 10.31.128.94	10.31.128.95
25	10.31.128.96/30	10.31.128.97 – 10.31.128.98	10.31.128.99
26	10.31.128.100/30	10.31.128.101 – 10.31.128.102	10.31.128.103
27	10.31.128.104/30	10.31.128.105 – 10.31.128.106	10.31.128.107
28	10.31.128.108/30	10.31.128.109 – 10.31.128.110	10.31.128.111
29	10.31.128.112/30	10.31.128.113 – 10.31.128.114	10.31.128.115
30	10.31.128.116/30	10.31.128.117 – 10.31.128.118	10.31.128.119
31	10.31.128.120/30	10.31.128.121 – 10.31.128.122	10.31.128.123
32	10.31.128.124/30	10.31.128.125 – 10.31.128.126	10.31.128.127
33	10.31.128.128/30	10.31.128.129 – 10.31.128.130	10.31.128.131
34	10.31.128.132/30	10.31.128.133 – 10.31.128.134	10.31.128.135
35	10.31.128.136/30	10.31.128.137 – 10.31.128.138	10.31.128.139
36	10.31.128.140/30	10.31.128.141 – 10.31.128.142	10.31.128.143
37	10.31.128.144/30	10.31.128.145 – 10.31.128.146	10.31.128.147
38	10.31.128.148/30	10.31.128.149 – 10.31.128.150	10.31.128.151
39	10.31.128.152/30	10.31.128.153 – 10.31.128.154	10.31.128.155
40	10.31.128.156/30	10.31.128.157 – 10.31.128.158	10.31.128.159
41	10.31.128.160/30	10.31.128.161 – 10.31.128.162	10.31.128.163
42	10.31.128.164/30	10.31.128.165 – 10.31.128.166	10.31.128.167
43	10.31.128.168/30	10.31.128.169 – 10.31.128.170	10.31.128.171
44	10.31.128.172/30	10.31.128.173 – 10.31.128.174	10.31.128.175
45	10.31.128.176/30	10.31.128.177 – 10.31.128.178	10.31.128.179
46	10.31.128.180/30	10.31.128.181 – 10.31.128.182	10.31.128.183
47	10.31.128.184/30	10.31.128.185 – 10.31.128.186	10.31.128.187
48	10.31.128.188/30	10.31.128.189 – 10.31.128.190	10.31.128.191
49	10.31.128.192/30	10.31.128.193 – 10.31.128.194	10.31.128.195
50	10.31.128.196/30	10.31.128.197 – 10.31.128.198	10.31.128.199
51	10.31.128.200/30	10.31.128.201 – 10.31.128.202	10.31.128.203
52	10.31.128.204/30	10.31.128.205 – 10.31.128.206	10.31.128.207
53	10.31.128.208/30	10.31.128.209 – 10.31.128.210	10.31.128.211
54	10.31.128.212/30	10.31.128.213 – 10.31.128.214	10.31.128.215
55	10.31.128.216/30	10.31.128.217 – 10.31.128.218	10.31.128.219
56	10.31.128.220/30	10.31.128.221 – 10.31.128.222	10.31.128.223
57	10.31.128.224/30	10.31.128.225 – 10.31.128.226	10.31.128.227
58	10.31.128.228/30	10.31.128.229 – 10.31.128.230	10.31.128.231
59	10.31.128.232/30	10.31.128.233 – 10.31.128.234	10.31.128.235
60	10.31.128.236/30	10.31.128.237 – 10.31.128.238	10.31.128.239
61	10.31.128.240/30	10.31.128.241 – 10.31.128.242	10.31.128.243
62	10.31.128.244/30	10.31.128.245 – 10.31.128.246	10.31.128.247
63	10.31.128.248/30	10.31.128.249 – 10.31.128.250	10.31.128.251
64	10.31.128.252/30	10.31.128.253 – 10.31.128.254	10.31.128.255
65	10.31.129.0/30	10.31.129.1 – 10.31.129.2	10.31.129.3
66	10.31.129.4/30	10.31.129.5 – 10.31.129.6	10.31.129.7
67	10.31.129.8/30	10.31.129.9 – 10.31.129.10	10.31.129.11
68	10.31.129.12/30	10.31.129.13 – 10.31.129.14	10.31.129.15
69	10.31.129.16/30	10.31.129.17 – 10.31.129.18	10.31.129.19
70	10.31.129.20/30	10.31.129.21 – 10.31.129.22	10.31.129.23
71	10.31.129.24/30	10.31.129.25 – 10.31.129.26	10.31.129.27
72	10.31.129.28/30	10.31.129.29 – 10.31.129.30	10.31.129.31
73	10.31.129.32/30	10.31.129.33 – 10.31.129.34	10.31.129.35
74	10.31.129.36/30	10.31.129.37 – 10.31.129.38	10.31.129.39
75	10.31.129.40/30	10.31.129.41 – 10.31.129.42	10.31.129.43
76	10.31.129.44/30	10.31.129.45 – 10.31.129.46	10.31.129.47
77	10.31.129.48/30	10.31.129.49 – 10.31.129.50	10.31.129.51
78	10.31.129.52/30	10.31.129.53 – 10.31.129.54	10.31.129.55
79	10.31.129.56/30	10.31.129.57 – 10.31.129.58	10.31.129.59
80	10.31.129.60/30	10.31.129.61 – 10.31.129.62	10.31.129.63
81	10.31.129.64/30	10.31.129.65 – 10.31.129.66	10.31.129.67
82	10.31.129.68/30	10.31.129.69 – 10.31.129.70	10.31.129.71
83	10.31.129.72/30	10.31.129.73 – 10.31.129.74	10.31.129.75
84	10.31.129.76/30	10.31.129.77 – 10.31.129.78	10.31.129.79
85	10.31.129.80/30	10.31.129.81 – 10.31.129.82	10.31.129.83
86	10.31.129.84/30	10.31.129.85 – 10.31.129.86	10.31.129.87
87	10.31.129.88/30	10.31.129.89 – 10.31.129.90	10.31.129.91
88	10.31.129.92/30	10.31.129.93 – 10.31.129.94	10.31.129.95
89	10.31.129.96/30	10.31.129.97 – 10.31.129.98	10.31.129.99
90	10.31.129.100/30	10.31.129.101 – 10.31.129.102	10.31.129.103
91	10.31.129.104/30	10.31.129.105 – 10.31.129.106	10.31.129.107
92	10.31.129.108/30	10.31.129.109 – 10.31.129.110	10.31.129.111
93	10.31.129.112/30	10.31.129.113 – 10.31.129.114	10.31.129.115
94	10.31.129.116/30	10.31.129.117 – 10.31.129.118	10.31.129.119
95	10.31.129.120/30	10.31.129.121 – 10.31.129.122	10.31.129.123
96	10.31.129.124/30	10.31.129.125 – 10.31.129.126	10.31.129.127
97	10.31.129.128/30	10.31.129.129 – 10.31.129.130	10.31.129.131
98	10.31.129.132/30	10.31.129.133 – 10.31.129.134	10.31.129.135
99	10.31.129.136/30	10.31.129.137 – 10.31.129.138	10.31.129.139
100	10.31.129.140/30	10.31.129.141 – 10.31.129.142	10.31.129.143
101	10.31.129.144/30	10.31.129.145 – 10.31.129.146	10.31.129.147
102	10.31.129.148/30	10.31.129.149 – 10.31.129.150	10.31.129.151
103	10.31.129.152/30	10.31.129.153 – 10.31.129.154	10.31.129.155
104	10.31.129.156/30	10.31.129.157 – 10.31.129.158	10.31.129.159
105	10.31.129.160/30	10.31.129.161 – 10.31.129.162	10.31.129.163
106	10.31.129.164/30	10.31.129.165 – 10.31.129.166	10.31.129.167
107	10.31.129.168/30	10.31.129.169 – 10.31.129.170	10.31.129.171
108	10.31.129.172/30	10.31.129.173 – 10.31.129.174	10.31.129.175
109	10.31.129.176/30	10.31.129.177 – 10.31.129.178	10.31.129.179
110	10.31.129.180/30	10.31.129.181 – 10.31.129.182	10.31.129.183
111	10.31.129.184/30	10.31.129.185 – 10.31.129.186	10.31.129.187
112	10.31.129.188/30	10.31.129.189 – 10.31.129.190	10.31.129.191
113	10.31.129.192/30	10.31.129.193 – 10.31.129.194	10.31.129.195
114	10.31.129.196/30	10.31.129.197 – 10.31.129.198	10.31.129.199
115	10.31.129.200/30	10.31.129.201 – 10.31.129.202	10.31.129.203
116	10.31.129.204/30	10.31.129.205 – 10.31.129.206	10.31.129.207
117	10.31.129.208/30	10.31.129.209 – 10.31.129.210	10.31.129.211
118	10.31.129.212/30	10.31.129.213 – 10.31.129.214	10.31.129.215
119	10.31.129.216/30	10.31.129.217 – 10.31.129.218	10.31.129.219
120	10.31.129.220/30	10.31.129.221 – 10.31.129.222	10.31.129.223
121	10.31.129.224/30	10.31.129.225 – 10.31.129.226	10.31.129.227
122	10.31.129.228/30	10.31.129.229 – 10.31.129.230	10.31.129.231
123	10.31.129.232/30	10.31.129.233 – 10.31.129.234	10.31.129.235
124	10.31.129.236/30	10.31.129.237 – 10.31.129.238	10.31.129.239
125	10.31.129.240/30	10.31.129.241 – 10.31.129.242	10.31.129.243
126	10.31.129.244/30	10.31.129.245 – 10.31.129.246	10.31.129.247
127	10.31.129.248/30	10.31.129.249 – 10.31.129.250	10.31.129.251
128	10.31.129.252/30	10.31.129.253 – 10.31.129.254	10.31.129.255
129	10.31.130.0/30	10.31.130.1 – 10.31.130.2	10.31.130.3
130	10.31.130.4/30	10.31.130.5 – 10.31.130.6	10.31.130.7
131	10.31.130.8/30	10.31.130.9 – 10.31.130.10	10.31.130.11
132	10.31.130.12/30	10.31.130.13 – 10.31.130.14	10.31.130.15
133	10.31.130.16/30	10.31.130.17 – 10.31.130.18	10.31.130.19
134	10.31.130.20/30	10.31.130.21 – 10.31.130.22	10.31.130.23
135	10.31.130.24/30	10.31.130.25 – 10.31.130.26	10.31.130.27
136	10.31.130.28/30	10.31.130.29 – 10.31.130.30	10.31.130.31
137	10.31.130.32/30	10.31.130.33 – 10.31.130.34	10.31.130.35
138	10.31.130.36/30	10.31.130.37 – 10.31.130.38	10.31.130.39
139	10.31.130.40/30	10.31.130.41 – 10.31.130.42	10.31.130.43
140	10.31.130.44/30	10.31.130.45 – 10.31.130.46	10.31.130.47
141	10.31.130.48/30	10.31.130.49 – 10.31.130.50	10.31.130.51
142	10.31.130.52/30	10.31.130.53 – 10.31.130.54	10.31.130.55
143	10.31.130.56/30	10.31.130.57 – 10.31.130.58	10.31.130.59
144	10.31.130.60/30	10.31.130.61 – 10.31.130.62	10.31.130.63
145	10.31.130.64/30	10.31.130.65 – 10.31.130.66	10.31.130.67
146	10.31.130.68/30	10.31.130.69 – 10.31.130.70	10.31.130.71
147	10.31.130.72/30	10.31.130.73 – 10.31.130.74	10.31.130.75
148	10.31.130.76/30	10.31.130.77 – 10.31.130.78	10.31.130.79
149	10.31.130.80/30	10.31.130.81 – 10.31.130.82	10.31.130.83
150	10.31.130.84/30	10.31.130.85 – 10.31.130.86	10.31.130.87
151	10.31.130.88/30	10.31.130.89 – 10.31.130.90	10.31.130.91
152	10.31.130.92/30	10.31.130.93 – 10.31.130.94	10.31.130.95
153	10.31.130.96/30	10.31.130.97 – 10.31.130.98	10.31.130.99
154	10.31.130.100/30	10.31.130.101 – 10.31.130.102	10.31.130.103
155	10.31.130.104/30	10.31.130.105 – 10.31.130.106	10.31.130.107
156	10.31.130.108/30	10.31.130.109 – 10.31.130.110	10.31.130.111
157	10.31.130.112/30	10.31.130.113 – 10.31.130.114	10.31.130.115
158	10.31.130.116/30	10.31.130.117 – 10.31.130.118	10.31.130.119
159	10.31.130.120/30	10.31.130.121 – 10.31.130.122	10.31.130.123
160	10.31.130.124/30	10.31.130.125 – 10.31.130.126	10.31.130.127
161	10.31.130.128/30	10.31.130.129 – 10.31.130.130	10.31.130.131
162	10.31.130.132/30	10.31.130.133 – 10.31.130.134	10.31.130.135
163	10.31.130.136/30	10.31.130.137 – 10.31.130.138	10.31.130.139
164	10.31.130.140/30	10.31.130.141 – 10.31.130.142	10.31.130.143
165	10.31.130.144/30	10.31.130.145 – 10.31.130.146	10.31.130.147
166	10.31.130.148/30	10.31.130.149 – 10.31.130.150	10.31.130.151
167	10.31.130.152/30	10.31.130.153 – 10.31.130.154	10.31.130.155
168	10.31.130.156/30	10.31.130.157 – 10.31.130.158	10.31.130.159
169	10.31.130.160/30	10.31.130.161 – 10.31.130.162	10.31.130.163
170	10.31.130.164/30	10.31.130.165 – 10.31.130.166	10.31.130.167
171	10.31.130.168/30	10.31.130.169 – 10.31.130.170	10.31.130.171
172	10.31.130.172/30	10.31.130.173 – 10.31.130.174	10.31.130.175
173	10.31.130.176/30	10.31.130.177 – 10.31.130.178	10.31.130.179
174	10.31.130.180/30	10.31.130.181 – 10.31.130.182	10.31.130.183
175	10.31.130.184/30	10.31.130.185 – 10.31.130.186	10.31.130.187
176	10.31.130.188/30	10.31.130.189 – 10.31.130.190	10.31.130.191
177	10.31.130.192/30	10.31.130.193 – 10.31.130.194	10.31.130.195
178	10.31.130.196/30	10.31.130.197 – 10.31.130.198	10.31.130.199
179	10.31.130.200/30	10.31.130.201 – 10.31.130.202	10.31.130.203
180	10.31.130.204/30	10.31.130.205 – 10.31.130.206	10.31.130.207
181	10.31.130.208/30	10.31.130.209 – 10.31.130.210	10.31.130.211
182	10.31.130.212/30	10.31.130.213 – 10.31.130.214	10.31.130.215
183	10.31.130.216/30	10.31.130.217 – 10.31.130.218	10.31.130.219
184	10.31.130.220/30	10.31.130.221 – 10.31.130.222	10.31.130.223
185	10.31.130.224/30	10.31.130.225 – 10.31.130.226	10.31.130.227
186	10.31.130.228/30	10.31.130.229 – 10.31.130.230	10.31.130.231
187	10.31.130.232/30	10.31.130.233 – 10.31.130.234	10.31.130.235
188	10.31.130.236/30	10.31.130.237 – 10.31.130.238	10.31.130.239
189	10.31.130.240/30	10.31.130.241 – 10.31.130.242	10.31.130.243
190	10.31.130.244/30	10.31.130.245 – 10.31.130.246	10.31.130.247
191	10.31.130.248/30	10.31.130.249 – 10.31.130.250	10.31.130.251
192	10.31.130.252/30	10.31.130.253 – 10.31.130.254	10.31.130.255
193	10.31.131.0/30	10.31.131.1 – 10.31.131.2	10.31.131.3
194	10.31.131.4/30	10.31.131.5 – 10.31.131.6	10.31.131.7
195	10.31.131.8/30	10.31.131.9 – 10.31.131.10	10.31.131.11
196	10.31.131.12/30	10.31.131.13 – 10.31.131.14	10.31.131.15
197	10.31.131.16/30	10.31.131.17 – 10.31.131.18	10.31.131.19
198	10.31.131.20/30	10.31.131.21 – 10.31.131.22	10.31.131.23
199	10.31.131.24/30	10.31.131.25 – 10.31.131.26	10.31.131.27
200	10.31.131.28/30	10.31.131.29 – 10.31.131.30	10.31.131.31
201	10.31.131.32/30	10.31.131.33 – 10.31.131.34	10.31.131.35
202	10.31.131.36/30	10.31.131.37 – 10.31.131.38	10.31.131.39
203	10.31.131.40/30	10.31.131.41 – 10.31.131.42	10.31.131.43
204	10.31.131.44/30	10.31.131.45 – 10.31.131.46	10.31.131.47
205	10.31.131.48/30	10.31.131.49 – 10.31.131.50	10.31.131.51
206	10.31.131.52/30	10.31.131.53 – 10.31.131.54	10.31.131.55
207	10.31.131.56/30	10.31.131.57 – 10.31.131.58	10.31.131.59
208	10.31.131.60/30	10.31.131.61 – 10.31.131.62	10.31.131.63
209	10.31.131.64/30	10.31.131.65 – 10.31.131.66	10.31.131.67
210	10.31.131.68/30	10.31.131.69 – 10.31.131.70	10.31.131.71
211	10.31.131.72/30	10.31.131.73 – 10.31.131.74	10.31.131.75
212	10.31.131.76/30	10.31.131.77 – 10.31.131.78	10.31.131.79
213	10.31.131.80/30	10.31.131.81 – 10.31.131.82	10.31.131.83
214	10.31.131.84/30	10.31.131.85 – 10.31.131.86	10.31.131.87
215	10.31.131.88/30	10.31.131.89 – 10.31.131.90	10.31.131.91
216	10.31.131.92/30	10.31.131.93 – 10.31.131.94	10.31.131.95
217	10.31.131.96/30	10.31.131.97 – 10.31.131.98	10.31.131.99
218	10.31.131.100/30	10.31.131.101 – 10.31.131.102	10.31.131.103
219	10.31.131.104/30	10.31.131.105 – 10.31.131.106	10.31.131.107
220	10.31.131.108/30	10.31.131.109 – 10.31.131.110	10.31.131.111
221	10.31.131.112/30	10.31.131.113 – 10.31.131.114	10.31.131.115
222	10.31.131.116/30	10.31.131.117 – 10.31.131.118	10.31.131.119
223	10.31.131.120/30	10.31.131.121 – 10.31.131.122	10.31.131.123
224	10.31.131.124/30	10.31.131.125 – 10.31.131.126	10.31.131.127
225	10.31.131.128/30	10.31.131.129 – 10.31.131.130	10.31.131.131
226	10.31.131.132/30	10.31.131.133 – 10.31.131.134	10.31.131.135
227	10.31.131.136/30	10.31.131.137 – 10.31.131.138	10.31.131.139
228	10.31.131.140/30	10.31.131.141 – 10.31.131.142	10.31.131.143
229	10.31.131.144/30	10.31.131.145 – 10.31.131.146	10.31.131.147
230	10.31.131.148/30	10.31.131.149 – 10.31.131.150	10.31.131.151
231	10.31.131.152/30	10.31.131.153 – 10.31.131.154	10.31.131.155
232	10.31.131.156/30	10.31.131.157 – 10.31.131.158	10.31.131.159
233	10.31.131.160/30	10.31.131.161 – 10.31.131.162	10.31.131.163
234	10.31.131.164/30	10.31.131.165 – 10.31.131.166	10.31.131.167
235	10.31.131.168/30	10.31.131.169 – 10.31.131.170	10.31.131.171
236	10.31.131.172/30	10.31.131.173 – 10.31.131.174	10.31.131.175
237	10.31.131.176/30	10.31.131.177 – 10.31.131.178	10.31.131.179
238	10.31.131.180/30	10.31.131.181 – 10.31.131.182	10.31.131.183
239	10.31.131.184/30	10.31.131.185 – 10.31.131.186	10.31.131.187
240	10.31.131.188/30	10.31.131.189 – 10.31.131.190	10.31.131.191
241	10.31.131.192/30	10.31.131.193 – 10.31.131.194	10.31.131.195
242	10.31.131.196/30	10.31.131.197 – 10.31.131.198	10.31.131.199
243	10.31.131.200/30	10.31.131.201 – 10.31.131.202	10.31.131.203
244	10.31.131.204/30	10.31.131.205 – 10.31.131.206	10.31.131.207
245	10.31.131.208/30	10.31.131.209 – 10.31.131.210	10.31.131.211
246	10.31.131.212/30	10.31.131.213 – 10.31.131.214	10.31.131.215
247	10.31.131.216/30	10.31.131.217 – 10.31.131.218	10.31.131.219
248	10.31.131.220/30	10.31.131.221 – 10.31.131.222	10.31.131.223
249	10.31.131.224/30	10.31.131.225 – 10.31.131.226	10.31.131.227
250	10.31.131.228/30	10.31.131.229 – 10.31.131.230	10.31.131.231
251	10.31.131.232/30	10.31.131.233 – 10.31.131.234	10.31.131.235
252	10.31.131.236/30	10.31.131.237 – 10.31.131.238	10.31.131.239
253	10.31.131.240/30	10.31.131.241 – 10.31.131.242	10.31.131.243
254	10.31.131.244/30	10.31.131.245 – 10.31.131.246	10.31.131.247
255	10.31.131.248/30	10.31.131.249 – 10.31.131.250	10.31.131.251
256	10.31.131.252/30	10.31.131.253 – 10.31.131.254	10.31.131.255

showing 256 of 4,096

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →