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)10.42.64.0/18

network10.42.64.0/18

broadcast10.42.127.255

first host10.42.64.1

last host10.42.127.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.42.64.0/18

address00001010.00101010.01000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101010.01000000.00000000

broadcast00001010.00101010.01111111.11111111

green = network part, grey = host part

hex0x0a2a4000

decimal170541056

reverse dns0.64.42.10.in-addr.arpa

ipv4-mapped::ffff:a2a:4000

/18 split into /30 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.42.64.0/30	10.42.64.1 – 10.42.64.2	10.42.64.3
2	10.42.64.4/30	10.42.64.5 – 10.42.64.6	10.42.64.7
3	10.42.64.8/30	10.42.64.9 – 10.42.64.10	10.42.64.11
4	10.42.64.12/30	10.42.64.13 – 10.42.64.14	10.42.64.15
5	10.42.64.16/30	10.42.64.17 – 10.42.64.18	10.42.64.19
6	10.42.64.20/30	10.42.64.21 – 10.42.64.22	10.42.64.23
7	10.42.64.24/30	10.42.64.25 – 10.42.64.26	10.42.64.27
8	10.42.64.28/30	10.42.64.29 – 10.42.64.30	10.42.64.31
9	10.42.64.32/30	10.42.64.33 – 10.42.64.34	10.42.64.35
10	10.42.64.36/30	10.42.64.37 – 10.42.64.38	10.42.64.39
11	10.42.64.40/30	10.42.64.41 – 10.42.64.42	10.42.64.43
12	10.42.64.44/30	10.42.64.45 – 10.42.64.46	10.42.64.47
13	10.42.64.48/30	10.42.64.49 – 10.42.64.50	10.42.64.51
14	10.42.64.52/30	10.42.64.53 – 10.42.64.54	10.42.64.55
15	10.42.64.56/30	10.42.64.57 – 10.42.64.58	10.42.64.59
16	10.42.64.60/30	10.42.64.61 – 10.42.64.62	10.42.64.63
17	10.42.64.64/30	10.42.64.65 – 10.42.64.66	10.42.64.67
18	10.42.64.68/30	10.42.64.69 – 10.42.64.70	10.42.64.71
19	10.42.64.72/30	10.42.64.73 – 10.42.64.74	10.42.64.75
20	10.42.64.76/30	10.42.64.77 – 10.42.64.78	10.42.64.79
21	10.42.64.80/30	10.42.64.81 – 10.42.64.82	10.42.64.83
22	10.42.64.84/30	10.42.64.85 – 10.42.64.86	10.42.64.87
23	10.42.64.88/30	10.42.64.89 – 10.42.64.90	10.42.64.91
24	10.42.64.92/30	10.42.64.93 – 10.42.64.94	10.42.64.95
25	10.42.64.96/30	10.42.64.97 – 10.42.64.98	10.42.64.99
26	10.42.64.100/30	10.42.64.101 – 10.42.64.102	10.42.64.103
27	10.42.64.104/30	10.42.64.105 – 10.42.64.106	10.42.64.107
28	10.42.64.108/30	10.42.64.109 – 10.42.64.110	10.42.64.111
29	10.42.64.112/30	10.42.64.113 – 10.42.64.114	10.42.64.115
30	10.42.64.116/30	10.42.64.117 – 10.42.64.118	10.42.64.119
31	10.42.64.120/30	10.42.64.121 – 10.42.64.122	10.42.64.123
32	10.42.64.124/30	10.42.64.125 – 10.42.64.126	10.42.64.127
33	10.42.64.128/30	10.42.64.129 – 10.42.64.130	10.42.64.131
34	10.42.64.132/30	10.42.64.133 – 10.42.64.134	10.42.64.135
35	10.42.64.136/30	10.42.64.137 – 10.42.64.138	10.42.64.139
36	10.42.64.140/30	10.42.64.141 – 10.42.64.142	10.42.64.143
37	10.42.64.144/30	10.42.64.145 – 10.42.64.146	10.42.64.147
38	10.42.64.148/30	10.42.64.149 – 10.42.64.150	10.42.64.151
39	10.42.64.152/30	10.42.64.153 – 10.42.64.154	10.42.64.155
40	10.42.64.156/30	10.42.64.157 – 10.42.64.158	10.42.64.159
41	10.42.64.160/30	10.42.64.161 – 10.42.64.162	10.42.64.163
42	10.42.64.164/30	10.42.64.165 – 10.42.64.166	10.42.64.167
43	10.42.64.168/30	10.42.64.169 – 10.42.64.170	10.42.64.171
44	10.42.64.172/30	10.42.64.173 – 10.42.64.174	10.42.64.175
45	10.42.64.176/30	10.42.64.177 – 10.42.64.178	10.42.64.179
46	10.42.64.180/30	10.42.64.181 – 10.42.64.182	10.42.64.183
47	10.42.64.184/30	10.42.64.185 – 10.42.64.186	10.42.64.187
48	10.42.64.188/30	10.42.64.189 – 10.42.64.190	10.42.64.191
49	10.42.64.192/30	10.42.64.193 – 10.42.64.194	10.42.64.195
50	10.42.64.196/30	10.42.64.197 – 10.42.64.198	10.42.64.199
51	10.42.64.200/30	10.42.64.201 – 10.42.64.202	10.42.64.203
52	10.42.64.204/30	10.42.64.205 – 10.42.64.206	10.42.64.207
53	10.42.64.208/30	10.42.64.209 – 10.42.64.210	10.42.64.211
54	10.42.64.212/30	10.42.64.213 – 10.42.64.214	10.42.64.215
55	10.42.64.216/30	10.42.64.217 – 10.42.64.218	10.42.64.219
56	10.42.64.220/30	10.42.64.221 – 10.42.64.222	10.42.64.223
57	10.42.64.224/30	10.42.64.225 – 10.42.64.226	10.42.64.227
58	10.42.64.228/30	10.42.64.229 – 10.42.64.230	10.42.64.231
59	10.42.64.232/30	10.42.64.233 – 10.42.64.234	10.42.64.235
60	10.42.64.236/30	10.42.64.237 – 10.42.64.238	10.42.64.239
61	10.42.64.240/30	10.42.64.241 – 10.42.64.242	10.42.64.243
62	10.42.64.244/30	10.42.64.245 – 10.42.64.246	10.42.64.247
63	10.42.64.248/30	10.42.64.249 – 10.42.64.250	10.42.64.251
64	10.42.64.252/30	10.42.64.253 – 10.42.64.254	10.42.64.255
65	10.42.65.0/30	10.42.65.1 – 10.42.65.2	10.42.65.3
66	10.42.65.4/30	10.42.65.5 – 10.42.65.6	10.42.65.7
67	10.42.65.8/30	10.42.65.9 – 10.42.65.10	10.42.65.11
68	10.42.65.12/30	10.42.65.13 – 10.42.65.14	10.42.65.15
69	10.42.65.16/30	10.42.65.17 – 10.42.65.18	10.42.65.19
70	10.42.65.20/30	10.42.65.21 – 10.42.65.22	10.42.65.23
71	10.42.65.24/30	10.42.65.25 – 10.42.65.26	10.42.65.27
72	10.42.65.28/30	10.42.65.29 – 10.42.65.30	10.42.65.31
73	10.42.65.32/30	10.42.65.33 – 10.42.65.34	10.42.65.35
74	10.42.65.36/30	10.42.65.37 – 10.42.65.38	10.42.65.39
75	10.42.65.40/30	10.42.65.41 – 10.42.65.42	10.42.65.43
76	10.42.65.44/30	10.42.65.45 – 10.42.65.46	10.42.65.47
77	10.42.65.48/30	10.42.65.49 – 10.42.65.50	10.42.65.51
78	10.42.65.52/30	10.42.65.53 – 10.42.65.54	10.42.65.55
79	10.42.65.56/30	10.42.65.57 – 10.42.65.58	10.42.65.59
80	10.42.65.60/30	10.42.65.61 – 10.42.65.62	10.42.65.63
81	10.42.65.64/30	10.42.65.65 – 10.42.65.66	10.42.65.67
82	10.42.65.68/30	10.42.65.69 – 10.42.65.70	10.42.65.71
83	10.42.65.72/30	10.42.65.73 – 10.42.65.74	10.42.65.75
84	10.42.65.76/30	10.42.65.77 – 10.42.65.78	10.42.65.79
85	10.42.65.80/30	10.42.65.81 – 10.42.65.82	10.42.65.83
86	10.42.65.84/30	10.42.65.85 – 10.42.65.86	10.42.65.87
87	10.42.65.88/30	10.42.65.89 – 10.42.65.90	10.42.65.91
88	10.42.65.92/30	10.42.65.93 – 10.42.65.94	10.42.65.95
89	10.42.65.96/30	10.42.65.97 – 10.42.65.98	10.42.65.99
90	10.42.65.100/30	10.42.65.101 – 10.42.65.102	10.42.65.103
91	10.42.65.104/30	10.42.65.105 – 10.42.65.106	10.42.65.107
92	10.42.65.108/30	10.42.65.109 – 10.42.65.110	10.42.65.111
93	10.42.65.112/30	10.42.65.113 – 10.42.65.114	10.42.65.115
94	10.42.65.116/30	10.42.65.117 – 10.42.65.118	10.42.65.119
95	10.42.65.120/30	10.42.65.121 – 10.42.65.122	10.42.65.123
96	10.42.65.124/30	10.42.65.125 – 10.42.65.126	10.42.65.127
97	10.42.65.128/30	10.42.65.129 – 10.42.65.130	10.42.65.131
98	10.42.65.132/30	10.42.65.133 – 10.42.65.134	10.42.65.135
99	10.42.65.136/30	10.42.65.137 – 10.42.65.138	10.42.65.139
100	10.42.65.140/30	10.42.65.141 – 10.42.65.142	10.42.65.143
101	10.42.65.144/30	10.42.65.145 – 10.42.65.146	10.42.65.147
102	10.42.65.148/30	10.42.65.149 – 10.42.65.150	10.42.65.151
103	10.42.65.152/30	10.42.65.153 – 10.42.65.154	10.42.65.155
104	10.42.65.156/30	10.42.65.157 – 10.42.65.158	10.42.65.159
105	10.42.65.160/30	10.42.65.161 – 10.42.65.162	10.42.65.163
106	10.42.65.164/30	10.42.65.165 – 10.42.65.166	10.42.65.167
107	10.42.65.168/30	10.42.65.169 – 10.42.65.170	10.42.65.171
108	10.42.65.172/30	10.42.65.173 – 10.42.65.174	10.42.65.175
109	10.42.65.176/30	10.42.65.177 – 10.42.65.178	10.42.65.179
110	10.42.65.180/30	10.42.65.181 – 10.42.65.182	10.42.65.183
111	10.42.65.184/30	10.42.65.185 – 10.42.65.186	10.42.65.187
112	10.42.65.188/30	10.42.65.189 – 10.42.65.190	10.42.65.191
113	10.42.65.192/30	10.42.65.193 – 10.42.65.194	10.42.65.195
114	10.42.65.196/30	10.42.65.197 – 10.42.65.198	10.42.65.199
115	10.42.65.200/30	10.42.65.201 – 10.42.65.202	10.42.65.203
116	10.42.65.204/30	10.42.65.205 – 10.42.65.206	10.42.65.207
117	10.42.65.208/30	10.42.65.209 – 10.42.65.210	10.42.65.211
118	10.42.65.212/30	10.42.65.213 – 10.42.65.214	10.42.65.215
119	10.42.65.216/30	10.42.65.217 – 10.42.65.218	10.42.65.219
120	10.42.65.220/30	10.42.65.221 – 10.42.65.222	10.42.65.223
121	10.42.65.224/30	10.42.65.225 – 10.42.65.226	10.42.65.227
122	10.42.65.228/30	10.42.65.229 – 10.42.65.230	10.42.65.231
123	10.42.65.232/30	10.42.65.233 – 10.42.65.234	10.42.65.235
124	10.42.65.236/30	10.42.65.237 – 10.42.65.238	10.42.65.239
125	10.42.65.240/30	10.42.65.241 – 10.42.65.242	10.42.65.243
126	10.42.65.244/30	10.42.65.245 – 10.42.65.246	10.42.65.247
127	10.42.65.248/30	10.42.65.249 – 10.42.65.250	10.42.65.251
128	10.42.65.252/30	10.42.65.253 – 10.42.65.254	10.42.65.255
129	10.42.66.0/30	10.42.66.1 – 10.42.66.2	10.42.66.3
130	10.42.66.4/30	10.42.66.5 – 10.42.66.6	10.42.66.7
131	10.42.66.8/30	10.42.66.9 – 10.42.66.10	10.42.66.11
132	10.42.66.12/30	10.42.66.13 – 10.42.66.14	10.42.66.15
133	10.42.66.16/30	10.42.66.17 – 10.42.66.18	10.42.66.19
134	10.42.66.20/30	10.42.66.21 – 10.42.66.22	10.42.66.23
135	10.42.66.24/30	10.42.66.25 – 10.42.66.26	10.42.66.27
136	10.42.66.28/30	10.42.66.29 – 10.42.66.30	10.42.66.31
137	10.42.66.32/30	10.42.66.33 – 10.42.66.34	10.42.66.35
138	10.42.66.36/30	10.42.66.37 – 10.42.66.38	10.42.66.39
139	10.42.66.40/30	10.42.66.41 – 10.42.66.42	10.42.66.43
140	10.42.66.44/30	10.42.66.45 – 10.42.66.46	10.42.66.47
141	10.42.66.48/30	10.42.66.49 – 10.42.66.50	10.42.66.51
142	10.42.66.52/30	10.42.66.53 – 10.42.66.54	10.42.66.55
143	10.42.66.56/30	10.42.66.57 – 10.42.66.58	10.42.66.59
144	10.42.66.60/30	10.42.66.61 – 10.42.66.62	10.42.66.63
145	10.42.66.64/30	10.42.66.65 – 10.42.66.66	10.42.66.67
146	10.42.66.68/30	10.42.66.69 – 10.42.66.70	10.42.66.71
147	10.42.66.72/30	10.42.66.73 – 10.42.66.74	10.42.66.75
148	10.42.66.76/30	10.42.66.77 – 10.42.66.78	10.42.66.79
149	10.42.66.80/30	10.42.66.81 – 10.42.66.82	10.42.66.83
150	10.42.66.84/30	10.42.66.85 – 10.42.66.86	10.42.66.87
151	10.42.66.88/30	10.42.66.89 – 10.42.66.90	10.42.66.91
152	10.42.66.92/30	10.42.66.93 – 10.42.66.94	10.42.66.95
153	10.42.66.96/30	10.42.66.97 – 10.42.66.98	10.42.66.99
154	10.42.66.100/30	10.42.66.101 – 10.42.66.102	10.42.66.103
155	10.42.66.104/30	10.42.66.105 – 10.42.66.106	10.42.66.107
156	10.42.66.108/30	10.42.66.109 – 10.42.66.110	10.42.66.111
157	10.42.66.112/30	10.42.66.113 – 10.42.66.114	10.42.66.115
158	10.42.66.116/30	10.42.66.117 – 10.42.66.118	10.42.66.119
159	10.42.66.120/30	10.42.66.121 – 10.42.66.122	10.42.66.123
160	10.42.66.124/30	10.42.66.125 – 10.42.66.126	10.42.66.127
161	10.42.66.128/30	10.42.66.129 – 10.42.66.130	10.42.66.131
162	10.42.66.132/30	10.42.66.133 – 10.42.66.134	10.42.66.135
163	10.42.66.136/30	10.42.66.137 – 10.42.66.138	10.42.66.139
164	10.42.66.140/30	10.42.66.141 – 10.42.66.142	10.42.66.143
165	10.42.66.144/30	10.42.66.145 – 10.42.66.146	10.42.66.147
166	10.42.66.148/30	10.42.66.149 – 10.42.66.150	10.42.66.151
167	10.42.66.152/30	10.42.66.153 – 10.42.66.154	10.42.66.155
168	10.42.66.156/30	10.42.66.157 – 10.42.66.158	10.42.66.159
169	10.42.66.160/30	10.42.66.161 – 10.42.66.162	10.42.66.163
170	10.42.66.164/30	10.42.66.165 – 10.42.66.166	10.42.66.167
171	10.42.66.168/30	10.42.66.169 – 10.42.66.170	10.42.66.171
172	10.42.66.172/30	10.42.66.173 – 10.42.66.174	10.42.66.175
173	10.42.66.176/30	10.42.66.177 – 10.42.66.178	10.42.66.179
174	10.42.66.180/30	10.42.66.181 – 10.42.66.182	10.42.66.183
175	10.42.66.184/30	10.42.66.185 – 10.42.66.186	10.42.66.187
176	10.42.66.188/30	10.42.66.189 – 10.42.66.190	10.42.66.191
177	10.42.66.192/30	10.42.66.193 – 10.42.66.194	10.42.66.195
178	10.42.66.196/30	10.42.66.197 – 10.42.66.198	10.42.66.199
179	10.42.66.200/30	10.42.66.201 – 10.42.66.202	10.42.66.203
180	10.42.66.204/30	10.42.66.205 – 10.42.66.206	10.42.66.207
181	10.42.66.208/30	10.42.66.209 – 10.42.66.210	10.42.66.211
182	10.42.66.212/30	10.42.66.213 – 10.42.66.214	10.42.66.215
183	10.42.66.216/30	10.42.66.217 – 10.42.66.218	10.42.66.219
184	10.42.66.220/30	10.42.66.221 – 10.42.66.222	10.42.66.223
185	10.42.66.224/30	10.42.66.225 – 10.42.66.226	10.42.66.227
186	10.42.66.228/30	10.42.66.229 – 10.42.66.230	10.42.66.231
187	10.42.66.232/30	10.42.66.233 – 10.42.66.234	10.42.66.235
188	10.42.66.236/30	10.42.66.237 – 10.42.66.238	10.42.66.239
189	10.42.66.240/30	10.42.66.241 – 10.42.66.242	10.42.66.243
190	10.42.66.244/30	10.42.66.245 – 10.42.66.246	10.42.66.247
191	10.42.66.248/30	10.42.66.249 – 10.42.66.250	10.42.66.251
192	10.42.66.252/30	10.42.66.253 – 10.42.66.254	10.42.66.255
193	10.42.67.0/30	10.42.67.1 – 10.42.67.2	10.42.67.3
194	10.42.67.4/30	10.42.67.5 – 10.42.67.6	10.42.67.7
195	10.42.67.8/30	10.42.67.9 – 10.42.67.10	10.42.67.11
196	10.42.67.12/30	10.42.67.13 – 10.42.67.14	10.42.67.15
197	10.42.67.16/30	10.42.67.17 – 10.42.67.18	10.42.67.19
198	10.42.67.20/30	10.42.67.21 – 10.42.67.22	10.42.67.23
199	10.42.67.24/30	10.42.67.25 – 10.42.67.26	10.42.67.27
200	10.42.67.28/30	10.42.67.29 – 10.42.67.30	10.42.67.31
201	10.42.67.32/30	10.42.67.33 – 10.42.67.34	10.42.67.35
202	10.42.67.36/30	10.42.67.37 – 10.42.67.38	10.42.67.39
203	10.42.67.40/30	10.42.67.41 – 10.42.67.42	10.42.67.43
204	10.42.67.44/30	10.42.67.45 – 10.42.67.46	10.42.67.47
205	10.42.67.48/30	10.42.67.49 – 10.42.67.50	10.42.67.51
206	10.42.67.52/30	10.42.67.53 – 10.42.67.54	10.42.67.55
207	10.42.67.56/30	10.42.67.57 – 10.42.67.58	10.42.67.59
208	10.42.67.60/30	10.42.67.61 – 10.42.67.62	10.42.67.63
209	10.42.67.64/30	10.42.67.65 – 10.42.67.66	10.42.67.67
210	10.42.67.68/30	10.42.67.69 – 10.42.67.70	10.42.67.71
211	10.42.67.72/30	10.42.67.73 – 10.42.67.74	10.42.67.75
212	10.42.67.76/30	10.42.67.77 – 10.42.67.78	10.42.67.79
213	10.42.67.80/30	10.42.67.81 – 10.42.67.82	10.42.67.83
214	10.42.67.84/30	10.42.67.85 – 10.42.67.86	10.42.67.87
215	10.42.67.88/30	10.42.67.89 – 10.42.67.90	10.42.67.91
216	10.42.67.92/30	10.42.67.93 – 10.42.67.94	10.42.67.95
217	10.42.67.96/30	10.42.67.97 – 10.42.67.98	10.42.67.99
218	10.42.67.100/30	10.42.67.101 – 10.42.67.102	10.42.67.103
219	10.42.67.104/30	10.42.67.105 – 10.42.67.106	10.42.67.107
220	10.42.67.108/30	10.42.67.109 – 10.42.67.110	10.42.67.111
221	10.42.67.112/30	10.42.67.113 – 10.42.67.114	10.42.67.115
222	10.42.67.116/30	10.42.67.117 – 10.42.67.118	10.42.67.119
223	10.42.67.120/30	10.42.67.121 – 10.42.67.122	10.42.67.123
224	10.42.67.124/30	10.42.67.125 – 10.42.67.126	10.42.67.127
225	10.42.67.128/30	10.42.67.129 – 10.42.67.130	10.42.67.131
226	10.42.67.132/30	10.42.67.133 – 10.42.67.134	10.42.67.135
227	10.42.67.136/30	10.42.67.137 – 10.42.67.138	10.42.67.139
228	10.42.67.140/30	10.42.67.141 – 10.42.67.142	10.42.67.143
229	10.42.67.144/30	10.42.67.145 – 10.42.67.146	10.42.67.147
230	10.42.67.148/30	10.42.67.149 – 10.42.67.150	10.42.67.151
231	10.42.67.152/30	10.42.67.153 – 10.42.67.154	10.42.67.155
232	10.42.67.156/30	10.42.67.157 – 10.42.67.158	10.42.67.159
233	10.42.67.160/30	10.42.67.161 – 10.42.67.162	10.42.67.163
234	10.42.67.164/30	10.42.67.165 – 10.42.67.166	10.42.67.167
235	10.42.67.168/30	10.42.67.169 – 10.42.67.170	10.42.67.171
236	10.42.67.172/30	10.42.67.173 – 10.42.67.174	10.42.67.175
237	10.42.67.176/30	10.42.67.177 – 10.42.67.178	10.42.67.179
238	10.42.67.180/30	10.42.67.181 – 10.42.67.182	10.42.67.183
239	10.42.67.184/30	10.42.67.185 – 10.42.67.186	10.42.67.187
240	10.42.67.188/30	10.42.67.189 – 10.42.67.190	10.42.67.191
241	10.42.67.192/30	10.42.67.193 – 10.42.67.194	10.42.67.195
242	10.42.67.196/30	10.42.67.197 – 10.42.67.198	10.42.67.199
243	10.42.67.200/30	10.42.67.201 – 10.42.67.202	10.42.67.203
244	10.42.67.204/30	10.42.67.205 – 10.42.67.206	10.42.67.207
245	10.42.67.208/30	10.42.67.209 – 10.42.67.210	10.42.67.211
246	10.42.67.212/30	10.42.67.213 – 10.42.67.214	10.42.67.215
247	10.42.67.216/30	10.42.67.217 – 10.42.67.218	10.42.67.219
248	10.42.67.220/30	10.42.67.221 – 10.42.67.222	10.42.67.223
249	10.42.67.224/30	10.42.67.225 – 10.42.67.226	10.42.67.227
250	10.42.67.228/30	10.42.67.229 – 10.42.67.230	10.42.67.231
251	10.42.67.232/30	10.42.67.233 – 10.42.67.234	10.42.67.235
252	10.42.67.236/30	10.42.67.237 – 10.42.67.238	10.42.67.239
253	10.42.67.240/30	10.42.67.241 – 10.42.67.242	10.42.67.243
254	10.42.67.244/30	10.42.67.245 – 10.42.67.246	10.42.67.247
255	10.42.67.248/30	10.42.67.249 – 10.42.67.250	10.42.67.251
256	10.42.67.252/30	10.42.67.253 – 10.42.67.254	10.42.67.255

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 →