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)10.31.192.0/19

network10.31.192.0/19

broadcast10.31.223.255

first host10.31.192.1

last host10.31.223.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.31.192.0/19

address00001010.00011111.11000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00011111.11000000.00000000

broadcast00001010.00011111.11011111.11111111

green = network part, grey = host part

hex0x0a1fc000

decimal169852928

reverse dns0.192.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:c000

/19 split into /30 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.31.192.0/30	10.31.192.1 – 10.31.192.2	10.31.192.3
2	10.31.192.4/30	10.31.192.5 – 10.31.192.6	10.31.192.7
3	10.31.192.8/30	10.31.192.9 – 10.31.192.10	10.31.192.11
4	10.31.192.12/30	10.31.192.13 – 10.31.192.14	10.31.192.15
5	10.31.192.16/30	10.31.192.17 – 10.31.192.18	10.31.192.19
6	10.31.192.20/30	10.31.192.21 – 10.31.192.22	10.31.192.23
7	10.31.192.24/30	10.31.192.25 – 10.31.192.26	10.31.192.27
8	10.31.192.28/30	10.31.192.29 – 10.31.192.30	10.31.192.31
9	10.31.192.32/30	10.31.192.33 – 10.31.192.34	10.31.192.35
10	10.31.192.36/30	10.31.192.37 – 10.31.192.38	10.31.192.39
11	10.31.192.40/30	10.31.192.41 – 10.31.192.42	10.31.192.43
12	10.31.192.44/30	10.31.192.45 – 10.31.192.46	10.31.192.47
13	10.31.192.48/30	10.31.192.49 – 10.31.192.50	10.31.192.51
14	10.31.192.52/30	10.31.192.53 – 10.31.192.54	10.31.192.55
15	10.31.192.56/30	10.31.192.57 – 10.31.192.58	10.31.192.59
16	10.31.192.60/30	10.31.192.61 – 10.31.192.62	10.31.192.63
17	10.31.192.64/30	10.31.192.65 – 10.31.192.66	10.31.192.67
18	10.31.192.68/30	10.31.192.69 – 10.31.192.70	10.31.192.71
19	10.31.192.72/30	10.31.192.73 – 10.31.192.74	10.31.192.75
20	10.31.192.76/30	10.31.192.77 – 10.31.192.78	10.31.192.79
21	10.31.192.80/30	10.31.192.81 – 10.31.192.82	10.31.192.83
22	10.31.192.84/30	10.31.192.85 – 10.31.192.86	10.31.192.87
23	10.31.192.88/30	10.31.192.89 – 10.31.192.90	10.31.192.91
24	10.31.192.92/30	10.31.192.93 – 10.31.192.94	10.31.192.95
25	10.31.192.96/30	10.31.192.97 – 10.31.192.98	10.31.192.99
26	10.31.192.100/30	10.31.192.101 – 10.31.192.102	10.31.192.103
27	10.31.192.104/30	10.31.192.105 – 10.31.192.106	10.31.192.107
28	10.31.192.108/30	10.31.192.109 – 10.31.192.110	10.31.192.111
29	10.31.192.112/30	10.31.192.113 – 10.31.192.114	10.31.192.115
30	10.31.192.116/30	10.31.192.117 – 10.31.192.118	10.31.192.119
31	10.31.192.120/30	10.31.192.121 – 10.31.192.122	10.31.192.123
32	10.31.192.124/30	10.31.192.125 – 10.31.192.126	10.31.192.127
33	10.31.192.128/30	10.31.192.129 – 10.31.192.130	10.31.192.131
34	10.31.192.132/30	10.31.192.133 – 10.31.192.134	10.31.192.135
35	10.31.192.136/30	10.31.192.137 – 10.31.192.138	10.31.192.139
36	10.31.192.140/30	10.31.192.141 – 10.31.192.142	10.31.192.143
37	10.31.192.144/30	10.31.192.145 – 10.31.192.146	10.31.192.147
38	10.31.192.148/30	10.31.192.149 – 10.31.192.150	10.31.192.151
39	10.31.192.152/30	10.31.192.153 – 10.31.192.154	10.31.192.155
40	10.31.192.156/30	10.31.192.157 – 10.31.192.158	10.31.192.159
41	10.31.192.160/30	10.31.192.161 – 10.31.192.162	10.31.192.163
42	10.31.192.164/30	10.31.192.165 – 10.31.192.166	10.31.192.167
43	10.31.192.168/30	10.31.192.169 – 10.31.192.170	10.31.192.171
44	10.31.192.172/30	10.31.192.173 – 10.31.192.174	10.31.192.175
45	10.31.192.176/30	10.31.192.177 – 10.31.192.178	10.31.192.179
46	10.31.192.180/30	10.31.192.181 – 10.31.192.182	10.31.192.183
47	10.31.192.184/30	10.31.192.185 – 10.31.192.186	10.31.192.187
48	10.31.192.188/30	10.31.192.189 – 10.31.192.190	10.31.192.191
49	10.31.192.192/30	10.31.192.193 – 10.31.192.194	10.31.192.195
50	10.31.192.196/30	10.31.192.197 – 10.31.192.198	10.31.192.199
51	10.31.192.200/30	10.31.192.201 – 10.31.192.202	10.31.192.203
52	10.31.192.204/30	10.31.192.205 – 10.31.192.206	10.31.192.207
53	10.31.192.208/30	10.31.192.209 – 10.31.192.210	10.31.192.211
54	10.31.192.212/30	10.31.192.213 – 10.31.192.214	10.31.192.215
55	10.31.192.216/30	10.31.192.217 – 10.31.192.218	10.31.192.219
56	10.31.192.220/30	10.31.192.221 – 10.31.192.222	10.31.192.223
57	10.31.192.224/30	10.31.192.225 – 10.31.192.226	10.31.192.227
58	10.31.192.228/30	10.31.192.229 – 10.31.192.230	10.31.192.231
59	10.31.192.232/30	10.31.192.233 – 10.31.192.234	10.31.192.235
60	10.31.192.236/30	10.31.192.237 – 10.31.192.238	10.31.192.239
61	10.31.192.240/30	10.31.192.241 – 10.31.192.242	10.31.192.243
62	10.31.192.244/30	10.31.192.245 – 10.31.192.246	10.31.192.247
63	10.31.192.248/30	10.31.192.249 – 10.31.192.250	10.31.192.251
64	10.31.192.252/30	10.31.192.253 – 10.31.192.254	10.31.192.255
65	10.31.193.0/30	10.31.193.1 – 10.31.193.2	10.31.193.3
66	10.31.193.4/30	10.31.193.5 – 10.31.193.6	10.31.193.7
67	10.31.193.8/30	10.31.193.9 – 10.31.193.10	10.31.193.11
68	10.31.193.12/30	10.31.193.13 – 10.31.193.14	10.31.193.15
69	10.31.193.16/30	10.31.193.17 – 10.31.193.18	10.31.193.19
70	10.31.193.20/30	10.31.193.21 – 10.31.193.22	10.31.193.23
71	10.31.193.24/30	10.31.193.25 – 10.31.193.26	10.31.193.27
72	10.31.193.28/30	10.31.193.29 – 10.31.193.30	10.31.193.31
73	10.31.193.32/30	10.31.193.33 – 10.31.193.34	10.31.193.35
74	10.31.193.36/30	10.31.193.37 – 10.31.193.38	10.31.193.39
75	10.31.193.40/30	10.31.193.41 – 10.31.193.42	10.31.193.43
76	10.31.193.44/30	10.31.193.45 – 10.31.193.46	10.31.193.47
77	10.31.193.48/30	10.31.193.49 – 10.31.193.50	10.31.193.51
78	10.31.193.52/30	10.31.193.53 – 10.31.193.54	10.31.193.55
79	10.31.193.56/30	10.31.193.57 – 10.31.193.58	10.31.193.59
80	10.31.193.60/30	10.31.193.61 – 10.31.193.62	10.31.193.63
81	10.31.193.64/30	10.31.193.65 – 10.31.193.66	10.31.193.67
82	10.31.193.68/30	10.31.193.69 – 10.31.193.70	10.31.193.71
83	10.31.193.72/30	10.31.193.73 – 10.31.193.74	10.31.193.75
84	10.31.193.76/30	10.31.193.77 – 10.31.193.78	10.31.193.79
85	10.31.193.80/30	10.31.193.81 – 10.31.193.82	10.31.193.83
86	10.31.193.84/30	10.31.193.85 – 10.31.193.86	10.31.193.87
87	10.31.193.88/30	10.31.193.89 – 10.31.193.90	10.31.193.91
88	10.31.193.92/30	10.31.193.93 – 10.31.193.94	10.31.193.95
89	10.31.193.96/30	10.31.193.97 – 10.31.193.98	10.31.193.99
90	10.31.193.100/30	10.31.193.101 – 10.31.193.102	10.31.193.103
91	10.31.193.104/30	10.31.193.105 – 10.31.193.106	10.31.193.107
92	10.31.193.108/30	10.31.193.109 – 10.31.193.110	10.31.193.111
93	10.31.193.112/30	10.31.193.113 – 10.31.193.114	10.31.193.115
94	10.31.193.116/30	10.31.193.117 – 10.31.193.118	10.31.193.119
95	10.31.193.120/30	10.31.193.121 – 10.31.193.122	10.31.193.123
96	10.31.193.124/30	10.31.193.125 – 10.31.193.126	10.31.193.127
97	10.31.193.128/30	10.31.193.129 – 10.31.193.130	10.31.193.131
98	10.31.193.132/30	10.31.193.133 – 10.31.193.134	10.31.193.135
99	10.31.193.136/30	10.31.193.137 – 10.31.193.138	10.31.193.139
100	10.31.193.140/30	10.31.193.141 – 10.31.193.142	10.31.193.143
101	10.31.193.144/30	10.31.193.145 – 10.31.193.146	10.31.193.147
102	10.31.193.148/30	10.31.193.149 – 10.31.193.150	10.31.193.151
103	10.31.193.152/30	10.31.193.153 – 10.31.193.154	10.31.193.155
104	10.31.193.156/30	10.31.193.157 – 10.31.193.158	10.31.193.159
105	10.31.193.160/30	10.31.193.161 – 10.31.193.162	10.31.193.163
106	10.31.193.164/30	10.31.193.165 – 10.31.193.166	10.31.193.167
107	10.31.193.168/30	10.31.193.169 – 10.31.193.170	10.31.193.171
108	10.31.193.172/30	10.31.193.173 – 10.31.193.174	10.31.193.175
109	10.31.193.176/30	10.31.193.177 – 10.31.193.178	10.31.193.179
110	10.31.193.180/30	10.31.193.181 – 10.31.193.182	10.31.193.183
111	10.31.193.184/30	10.31.193.185 – 10.31.193.186	10.31.193.187
112	10.31.193.188/30	10.31.193.189 – 10.31.193.190	10.31.193.191
113	10.31.193.192/30	10.31.193.193 – 10.31.193.194	10.31.193.195
114	10.31.193.196/30	10.31.193.197 – 10.31.193.198	10.31.193.199
115	10.31.193.200/30	10.31.193.201 – 10.31.193.202	10.31.193.203
116	10.31.193.204/30	10.31.193.205 – 10.31.193.206	10.31.193.207
117	10.31.193.208/30	10.31.193.209 – 10.31.193.210	10.31.193.211
118	10.31.193.212/30	10.31.193.213 – 10.31.193.214	10.31.193.215
119	10.31.193.216/30	10.31.193.217 – 10.31.193.218	10.31.193.219
120	10.31.193.220/30	10.31.193.221 – 10.31.193.222	10.31.193.223
121	10.31.193.224/30	10.31.193.225 – 10.31.193.226	10.31.193.227
122	10.31.193.228/30	10.31.193.229 – 10.31.193.230	10.31.193.231
123	10.31.193.232/30	10.31.193.233 – 10.31.193.234	10.31.193.235
124	10.31.193.236/30	10.31.193.237 – 10.31.193.238	10.31.193.239
125	10.31.193.240/30	10.31.193.241 – 10.31.193.242	10.31.193.243
126	10.31.193.244/30	10.31.193.245 – 10.31.193.246	10.31.193.247
127	10.31.193.248/30	10.31.193.249 – 10.31.193.250	10.31.193.251
128	10.31.193.252/30	10.31.193.253 – 10.31.193.254	10.31.193.255
129	10.31.194.0/30	10.31.194.1 – 10.31.194.2	10.31.194.3
130	10.31.194.4/30	10.31.194.5 – 10.31.194.6	10.31.194.7
131	10.31.194.8/30	10.31.194.9 – 10.31.194.10	10.31.194.11
132	10.31.194.12/30	10.31.194.13 – 10.31.194.14	10.31.194.15
133	10.31.194.16/30	10.31.194.17 – 10.31.194.18	10.31.194.19
134	10.31.194.20/30	10.31.194.21 – 10.31.194.22	10.31.194.23
135	10.31.194.24/30	10.31.194.25 – 10.31.194.26	10.31.194.27
136	10.31.194.28/30	10.31.194.29 – 10.31.194.30	10.31.194.31
137	10.31.194.32/30	10.31.194.33 – 10.31.194.34	10.31.194.35
138	10.31.194.36/30	10.31.194.37 – 10.31.194.38	10.31.194.39
139	10.31.194.40/30	10.31.194.41 – 10.31.194.42	10.31.194.43
140	10.31.194.44/30	10.31.194.45 – 10.31.194.46	10.31.194.47
141	10.31.194.48/30	10.31.194.49 – 10.31.194.50	10.31.194.51
142	10.31.194.52/30	10.31.194.53 – 10.31.194.54	10.31.194.55
143	10.31.194.56/30	10.31.194.57 – 10.31.194.58	10.31.194.59
144	10.31.194.60/30	10.31.194.61 – 10.31.194.62	10.31.194.63
145	10.31.194.64/30	10.31.194.65 – 10.31.194.66	10.31.194.67
146	10.31.194.68/30	10.31.194.69 – 10.31.194.70	10.31.194.71
147	10.31.194.72/30	10.31.194.73 – 10.31.194.74	10.31.194.75
148	10.31.194.76/30	10.31.194.77 – 10.31.194.78	10.31.194.79
149	10.31.194.80/30	10.31.194.81 – 10.31.194.82	10.31.194.83
150	10.31.194.84/30	10.31.194.85 – 10.31.194.86	10.31.194.87
151	10.31.194.88/30	10.31.194.89 – 10.31.194.90	10.31.194.91
152	10.31.194.92/30	10.31.194.93 – 10.31.194.94	10.31.194.95
153	10.31.194.96/30	10.31.194.97 – 10.31.194.98	10.31.194.99
154	10.31.194.100/30	10.31.194.101 – 10.31.194.102	10.31.194.103
155	10.31.194.104/30	10.31.194.105 – 10.31.194.106	10.31.194.107
156	10.31.194.108/30	10.31.194.109 – 10.31.194.110	10.31.194.111
157	10.31.194.112/30	10.31.194.113 – 10.31.194.114	10.31.194.115
158	10.31.194.116/30	10.31.194.117 – 10.31.194.118	10.31.194.119
159	10.31.194.120/30	10.31.194.121 – 10.31.194.122	10.31.194.123
160	10.31.194.124/30	10.31.194.125 – 10.31.194.126	10.31.194.127
161	10.31.194.128/30	10.31.194.129 – 10.31.194.130	10.31.194.131
162	10.31.194.132/30	10.31.194.133 – 10.31.194.134	10.31.194.135
163	10.31.194.136/30	10.31.194.137 – 10.31.194.138	10.31.194.139
164	10.31.194.140/30	10.31.194.141 – 10.31.194.142	10.31.194.143
165	10.31.194.144/30	10.31.194.145 – 10.31.194.146	10.31.194.147
166	10.31.194.148/30	10.31.194.149 – 10.31.194.150	10.31.194.151
167	10.31.194.152/30	10.31.194.153 – 10.31.194.154	10.31.194.155
168	10.31.194.156/30	10.31.194.157 – 10.31.194.158	10.31.194.159
169	10.31.194.160/30	10.31.194.161 – 10.31.194.162	10.31.194.163
170	10.31.194.164/30	10.31.194.165 – 10.31.194.166	10.31.194.167
171	10.31.194.168/30	10.31.194.169 – 10.31.194.170	10.31.194.171
172	10.31.194.172/30	10.31.194.173 – 10.31.194.174	10.31.194.175
173	10.31.194.176/30	10.31.194.177 – 10.31.194.178	10.31.194.179
174	10.31.194.180/30	10.31.194.181 – 10.31.194.182	10.31.194.183
175	10.31.194.184/30	10.31.194.185 – 10.31.194.186	10.31.194.187
176	10.31.194.188/30	10.31.194.189 – 10.31.194.190	10.31.194.191
177	10.31.194.192/30	10.31.194.193 – 10.31.194.194	10.31.194.195
178	10.31.194.196/30	10.31.194.197 – 10.31.194.198	10.31.194.199
179	10.31.194.200/30	10.31.194.201 – 10.31.194.202	10.31.194.203
180	10.31.194.204/30	10.31.194.205 – 10.31.194.206	10.31.194.207
181	10.31.194.208/30	10.31.194.209 – 10.31.194.210	10.31.194.211
182	10.31.194.212/30	10.31.194.213 – 10.31.194.214	10.31.194.215
183	10.31.194.216/30	10.31.194.217 – 10.31.194.218	10.31.194.219
184	10.31.194.220/30	10.31.194.221 – 10.31.194.222	10.31.194.223
185	10.31.194.224/30	10.31.194.225 – 10.31.194.226	10.31.194.227
186	10.31.194.228/30	10.31.194.229 – 10.31.194.230	10.31.194.231
187	10.31.194.232/30	10.31.194.233 – 10.31.194.234	10.31.194.235
188	10.31.194.236/30	10.31.194.237 – 10.31.194.238	10.31.194.239
189	10.31.194.240/30	10.31.194.241 – 10.31.194.242	10.31.194.243
190	10.31.194.244/30	10.31.194.245 – 10.31.194.246	10.31.194.247
191	10.31.194.248/30	10.31.194.249 – 10.31.194.250	10.31.194.251
192	10.31.194.252/30	10.31.194.253 – 10.31.194.254	10.31.194.255
193	10.31.195.0/30	10.31.195.1 – 10.31.195.2	10.31.195.3
194	10.31.195.4/30	10.31.195.5 – 10.31.195.6	10.31.195.7
195	10.31.195.8/30	10.31.195.9 – 10.31.195.10	10.31.195.11
196	10.31.195.12/30	10.31.195.13 – 10.31.195.14	10.31.195.15
197	10.31.195.16/30	10.31.195.17 – 10.31.195.18	10.31.195.19
198	10.31.195.20/30	10.31.195.21 – 10.31.195.22	10.31.195.23
199	10.31.195.24/30	10.31.195.25 – 10.31.195.26	10.31.195.27
200	10.31.195.28/30	10.31.195.29 – 10.31.195.30	10.31.195.31
201	10.31.195.32/30	10.31.195.33 – 10.31.195.34	10.31.195.35
202	10.31.195.36/30	10.31.195.37 – 10.31.195.38	10.31.195.39
203	10.31.195.40/30	10.31.195.41 – 10.31.195.42	10.31.195.43
204	10.31.195.44/30	10.31.195.45 – 10.31.195.46	10.31.195.47
205	10.31.195.48/30	10.31.195.49 – 10.31.195.50	10.31.195.51
206	10.31.195.52/30	10.31.195.53 – 10.31.195.54	10.31.195.55
207	10.31.195.56/30	10.31.195.57 – 10.31.195.58	10.31.195.59
208	10.31.195.60/30	10.31.195.61 – 10.31.195.62	10.31.195.63
209	10.31.195.64/30	10.31.195.65 – 10.31.195.66	10.31.195.67
210	10.31.195.68/30	10.31.195.69 – 10.31.195.70	10.31.195.71
211	10.31.195.72/30	10.31.195.73 – 10.31.195.74	10.31.195.75
212	10.31.195.76/30	10.31.195.77 – 10.31.195.78	10.31.195.79
213	10.31.195.80/30	10.31.195.81 – 10.31.195.82	10.31.195.83
214	10.31.195.84/30	10.31.195.85 – 10.31.195.86	10.31.195.87
215	10.31.195.88/30	10.31.195.89 – 10.31.195.90	10.31.195.91
216	10.31.195.92/30	10.31.195.93 – 10.31.195.94	10.31.195.95
217	10.31.195.96/30	10.31.195.97 – 10.31.195.98	10.31.195.99
218	10.31.195.100/30	10.31.195.101 – 10.31.195.102	10.31.195.103
219	10.31.195.104/30	10.31.195.105 – 10.31.195.106	10.31.195.107
220	10.31.195.108/30	10.31.195.109 – 10.31.195.110	10.31.195.111
221	10.31.195.112/30	10.31.195.113 – 10.31.195.114	10.31.195.115
222	10.31.195.116/30	10.31.195.117 – 10.31.195.118	10.31.195.119
223	10.31.195.120/30	10.31.195.121 – 10.31.195.122	10.31.195.123
224	10.31.195.124/30	10.31.195.125 – 10.31.195.126	10.31.195.127
225	10.31.195.128/30	10.31.195.129 – 10.31.195.130	10.31.195.131
226	10.31.195.132/30	10.31.195.133 – 10.31.195.134	10.31.195.135
227	10.31.195.136/30	10.31.195.137 – 10.31.195.138	10.31.195.139
228	10.31.195.140/30	10.31.195.141 – 10.31.195.142	10.31.195.143
229	10.31.195.144/30	10.31.195.145 – 10.31.195.146	10.31.195.147
230	10.31.195.148/30	10.31.195.149 – 10.31.195.150	10.31.195.151
231	10.31.195.152/30	10.31.195.153 – 10.31.195.154	10.31.195.155
232	10.31.195.156/30	10.31.195.157 – 10.31.195.158	10.31.195.159
233	10.31.195.160/30	10.31.195.161 – 10.31.195.162	10.31.195.163
234	10.31.195.164/30	10.31.195.165 – 10.31.195.166	10.31.195.167
235	10.31.195.168/30	10.31.195.169 – 10.31.195.170	10.31.195.171
236	10.31.195.172/30	10.31.195.173 – 10.31.195.174	10.31.195.175
237	10.31.195.176/30	10.31.195.177 – 10.31.195.178	10.31.195.179
238	10.31.195.180/30	10.31.195.181 – 10.31.195.182	10.31.195.183
239	10.31.195.184/30	10.31.195.185 – 10.31.195.186	10.31.195.187
240	10.31.195.188/30	10.31.195.189 – 10.31.195.190	10.31.195.191
241	10.31.195.192/30	10.31.195.193 – 10.31.195.194	10.31.195.195
242	10.31.195.196/30	10.31.195.197 – 10.31.195.198	10.31.195.199
243	10.31.195.200/30	10.31.195.201 – 10.31.195.202	10.31.195.203
244	10.31.195.204/30	10.31.195.205 – 10.31.195.206	10.31.195.207
245	10.31.195.208/30	10.31.195.209 – 10.31.195.210	10.31.195.211
246	10.31.195.212/30	10.31.195.213 – 10.31.195.214	10.31.195.215
247	10.31.195.216/30	10.31.195.217 – 10.31.195.218	10.31.195.219
248	10.31.195.220/30	10.31.195.221 – 10.31.195.222	10.31.195.223
249	10.31.195.224/30	10.31.195.225 – 10.31.195.226	10.31.195.227
250	10.31.195.228/30	10.31.195.229 – 10.31.195.230	10.31.195.231
251	10.31.195.232/30	10.31.195.233 – 10.31.195.234	10.31.195.235
252	10.31.195.236/30	10.31.195.237 – 10.31.195.238	10.31.195.239
253	10.31.195.240/30	10.31.195.241 – 10.31.195.242	10.31.195.243
254	10.31.195.244/30	10.31.195.245 – 10.31.195.246	10.31.195.247
255	10.31.195.248/30	10.31.195.249 – 10.31.195.250	10.31.195.251
256	10.31.195.252/30	10.31.195.253 – 10.31.195.254	10.31.195.255

showing 256 of 2,048

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