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)10.2.200.0/21

network10.2.200.0/21

broadcast10.2.207.255

first host10.2.200.1

last host10.2.207.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.200.0/21

address00001010.00000010.11001000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.11001000.00000000

broadcast00001010.00000010.11001111.11111111

green = network part, grey = host part

hex0x0a02c800

decimal167954432

reverse dns0.200.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.200.0/30	10.2.200.1 – 10.2.200.2	10.2.200.3
2	10.2.200.4/30	10.2.200.5 – 10.2.200.6	10.2.200.7
3	10.2.200.8/30	10.2.200.9 – 10.2.200.10	10.2.200.11
4	10.2.200.12/30	10.2.200.13 – 10.2.200.14	10.2.200.15
5	10.2.200.16/30	10.2.200.17 – 10.2.200.18	10.2.200.19
6	10.2.200.20/30	10.2.200.21 – 10.2.200.22	10.2.200.23
7	10.2.200.24/30	10.2.200.25 – 10.2.200.26	10.2.200.27
8	10.2.200.28/30	10.2.200.29 – 10.2.200.30	10.2.200.31
9	10.2.200.32/30	10.2.200.33 – 10.2.200.34	10.2.200.35
10	10.2.200.36/30	10.2.200.37 – 10.2.200.38	10.2.200.39
11	10.2.200.40/30	10.2.200.41 – 10.2.200.42	10.2.200.43
12	10.2.200.44/30	10.2.200.45 – 10.2.200.46	10.2.200.47
13	10.2.200.48/30	10.2.200.49 – 10.2.200.50	10.2.200.51
14	10.2.200.52/30	10.2.200.53 – 10.2.200.54	10.2.200.55
15	10.2.200.56/30	10.2.200.57 – 10.2.200.58	10.2.200.59
16	10.2.200.60/30	10.2.200.61 – 10.2.200.62	10.2.200.63
17	10.2.200.64/30	10.2.200.65 – 10.2.200.66	10.2.200.67
18	10.2.200.68/30	10.2.200.69 – 10.2.200.70	10.2.200.71
19	10.2.200.72/30	10.2.200.73 – 10.2.200.74	10.2.200.75
20	10.2.200.76/30	10.2.200.77 – 10.2.200.78	10.2.200.79
21	10.2.200.80/30	10.2.200.81 – 10.2.200.82	10.2.200.83
22	10.2.200.84/30	10.2.200.85 – 10.2.200.86	10.2.200.87
23	10.2.200.88/30	10.2.200.89 – 10.2.200.90	10.2.200.91
24	10.2.200.92/30	10.2.200.93 – 10.2.200.94	10.2.200.95
25	10.2.200.96/30	10.2.200.97 – 10.2.200.98	10.2.200.99
26	10.2.200.100/30	10.2.200.101 – 10.2.200.102	10.2.200.103
27	10.2.200.104/30	10.2.200.105 – 10.2.200.106	10.2.200.107
28	10.2.200.108/30	10.2.200.109 – 10.2.200.110	10.2.200.111
29	10.2.200.112/30	10.2.200.113 – 10.2.200.114	10.2.200.115
30	10.2.200.116/30	10.2.200.117 – 10.2.200.118	10.2.200.119
31	10.2.200.120/30	10.2.200.121 – 10.2.200.122	10.2.200.123
32	10.2.200.124/30	10.2.200.125 – 10.2.200.126	10.2.200.127
33	10.2.200.128/30	10.2.200.129 – 10.2.200.130	10.2.200.131
34	10.2.200.132/30	10.2.200.133 – 10.2.200.134	10.2.200.135
35	10.2.200.136/30	10.2.200.137 – 10.2.200.138	10.2.200.139
36	10.2.200.140/30	10.2.200.141 – 10.2.200.142	10.2.200.143
37	10.2.200.144/30	10.2.200.145 – 10.2.200.146	10.2.200.147
38	10.2.200.148/30	10.2.200.149 – 10.2.200.150	10.2.200.151
39	10.2.200.152/30	10.2.200.153 – 10.2.200.154	10.2.200.155
40	10.2.200.156/30	10.2.200.157 – 10.2.200.158	10.2.200.159
41	10.2.200.160/30	10.2.200.161 – 10.2.200.162	10.2.200.163
42	10.2.200.164/30	10.2.200.165 – 10.2.200.166	10.2.200.167
43	10.2.200.168/30	10.2.200.169 – 10.2.200.170	10.2.200.171
44	10.2.200.172/30	10.2.200.173 – 10.2.200.174	10.2.200.175
45	10.2.200.176/30	10.2.200.177 – 10.2.200.178	10.2.200.179
46	10.2.200.180/30	10.2.200.181 – 10.2.200.182	10.2.200.183
47	10.2.200.184/30	10.2.200.185 – 10.2.200.186	10.2.200.187
48	10.2.200.188/30	10.2.200.189 – 10.2.200.190	10.2.200.191
49	10.2.200.192/30	10.2.200.193 – 10.2.200.194	10.2.200.195
50	10.2.200.196/30	10.2.200.197 – 10.2.200.198	10.2.200.199
51	10.2.200.200/30	10.2.200.201 – 10.2.200.202	10.2.200.203
52	10.2.200.204/30	10.2.200.205 – 10.2.200.206	10.2.200.207
53	10.2.200.208/30	10.2.200.209 – 10.2.200.210	10.2.200.211
54	10.2.200.212/30	10.2.200.213 – 10.2.200.214	10.2.200.215
55	10.2.200.216/30	10.2.200.217 – 10.2.200.218	10.2.200.219
56	10.2.200.220/30	10.2.200.221 – 10.2.200.222	10.2.200.223
57	10.2.200.224/30	10.2.200.225 – 10.2.200.226	10.2.200.227
58	10.2.200.228/30	10.2.200.229 – 10.2.200.230	10.2.200.231
59	10.2.200.232/30	10.2.200.233 – 10.2.200.234	10.2.200.235
60	10.2.200.236/30	10.2.200.237 – 10.2.200.238	10.2.200.239
61	10.2.200.240/30	10.2.200.241 – 10.2.200.242	10.2.200.243
62	10.2.200.244/30	10.2.200.245 – 10.2.200.246	10.2.200.247
63	10.2.200.248/30	10.2.200.249 – 10.2.200.250	10.2.200.251
64	10.2.200.252/30	10.2.200.253 – 10.2.200.254	10.2.200.255
65	10.2.201.0/30	10.2.201.1 – 10.2.201.2	10.2.201.3
66	10.2.201.4/30	10.2.201.5 – 10.2.201.6	10.2.201.7
67	10.2.201.8/30	10.2.201.9 – 10.2.201.10	10.2.201.11
68	10.2.201.12/30	10.2.201.13 – 10.2.201.14	10.2.201.15
69	10.2.201.16/30	10.2.201.17 – 10.2.201.18	10.2.201.19
70	10.2.201.20/30	10.2.201.21 – 10.2.201.22	10.2.201.23
71	10.2.201.24/30	10.2.201.25 – 10.2.201.26	10.2.201.27
72	10.2.201.28/30	10.2.201.29 – 10.2.201.30	10.2.201.31
73	10.2.201.32/30	10.2.201.33 – 10.2.201.34	10.2.201.35
74	10.2.201.36/30	10.2.201.37 – 10.2.201.38	10.2.201.39
75	10.2.201.40/30	10.2.201.41 – 10.2.201.42	10.2.201.43
76	10.2.201.44/30	10.2.201.45 – 10.2.201.46	10.2.201.47
77	10.2.201.48/30	10.2.201.49 – 10.2.201.50	10.2.201.51
78	10.2.201.52/30	10.2.201.53 – 10.2.201.54	10.2.201.55
79	10.2.201.56/30	10.2.201.57 – 10.2.201.58	10.2.201.59
80	10.2.201.60/30	10.2.201.61 – 10.2.201.62	10.2.201.63
81	10.2.201.64/30	10.2.201.65 – 10.2.201.66	10.2.201.67
82	10.2.201.68/30	10.2.201.69 – 10.2.201.70	10.2.201.71
83	10.2.201.72/30	10.2.201.73 – 10.2.201.74	10.2.201.75
84	10.2.201.76/30	10.2.201.77 – 10.2.201.78	10.2.201.79
85	10.2.201.80/30	10.2.201.81 – 10.2.201.82	10.2.201.83
86	10.2.201.84/30	10.2.201.85 – 10.2.201.86	10.2.201.87
87	10.2.201.88/30	10.2.201.89 – 10.2.201.90	10.2.201.91
88	10.2.201.92/30	10.2.201.93 – 10.2.201.94	10.2.201.95
89	10.2.201.96/30	10.2.201.97 – 10.2.201.98	10.2.201.99
90	10.2.201.100/30	10.2.201.101 – 10.2.201.102	10.2.201.103
91	10.2.201.104/30	10.2.201.105 – 10.2.201.106	10.2.201.107
92	10.2.201.108/30	10.2.201.109 – 10.2.201.110	10.2.201.111
93	10.2.201.112/30	10.2.201.113 – 10.2.201.114	10.2.201.115
94	10.2.201.116/30	10.2.201.117 – 10.2.201.118	10.2.201.119
95	10.2.201.120/30	10.2.201.121 – 10.2.201.122	10.2.201.123
96	10.2.201.124/30	10.2.201.125 – 10.2.201.126	10.2.201.127
97	10.2.201.128/30	10.2.201.129 – 10.2.201.130	10.2.201.131
98	10.2.201.132/30	10.2.201.133 – 10.2.201.134	10.2.201.135
99	10.2.201.136/30	10.2.201.137 – 10.2.201.138	10.2.201.139
100	10.2.201.140/30	10.2.201.141 – 10.2.201.142	10.2.201.143
101	10.2.201.144/30	10.2.201.145 – 10.2.201.146	10.2.201.147
102	10.2.201.148/30	10.2.201.149 – 10.2.201.150	10.2.201.151
103	10.2.201.152/30	10.2.201.153 – 10.2.201.154	10.2.201.155
104	10.2.201.156/30	10.2.201.157 – 10.2.201.158	10.2.201.159
105	10.2.201.160/30	10.2.201.161 – 10.2.201.162	10.2.201.163
106	10.2.201.164/30	10.2.201.165 – 10.2.201.166	10.2.201.167
107	10.2.201.168/30	10.2.201.169 – 10.2.201.170	10.2.201.171
108	10.2.201.172/30	10.2.201.173 – 10.2.201.174	10.2.201.175
109	10.2.201.176/30	10.2.201.177 – 10.2.201.178	10.2.201.179
110	10.2.201.180/30	10.2.201.181 – 10.2.201.182	10.2.201.183
111	10.2.201.184/30	10.2.201.185 – 10.2.201.186	10.2.201.187
112	10.2.201.188/30	10.2.201.189 – 10.2.201.190	10.2.201.191
113	10.2.201.192/30	10.2.201.193 – 10.2.201.194	10.2.201.195
114	10.2.201.196/30	10.2.201.197 – 10.2.201.198	10.2.201.199
115	10.2.201.200/30	10.2.201.201 – 10.2.201.202	10.2.201.203
116	10.2.201.204/30	10.2.201.205 – 10.2.201.206	10.2.201.207
117	10.2.201.208/30	10.2.201.209 – 10.2.201.210	10.2.201.211
118	10.2.201.212/30	10.2.201.213 – 10.2.201.214	10.2.201.215
119	10.2.201.216/30	10.2.201.217 – 10.2.201.218	10.2.201.219
120	10.2.201.220/30	10.2.201.221 – 10.2.201.222	10.2.201.223
121	10.2.201.224/30	10.2.201.225 – 10.2.201.226	10.2.201.227
122	10.2.201.228/30	10.2.201.229 – 10.2.201.230	10.2.201.231
123	10.2.201.232/30	10.2.201.233 – 10.2.201.234	10.2.201.235
124	10.2.201.236/30	10.2.201.237 – 10.2.201.238	10.2.201.239
125	10.2.201.240/30	10.2.201.241 – 10.2.201.242	10.2.201.243
126	10.2.201.244/30	10.2.201.245 – 10.2.201.246	10.2.201.247
127	10.2.201.248/30	10.2.201.249 – 10.2.201.250	10.2.201.251
128	10.2.201.252/30	10.2.201.253 – 10.2.201.254	10.2.201.255
129	10.2.202.0/30	10.2.202.1 – 10.2.202.2	10.2.202.3
130	10.2.202.4/30	10.2.202.5 – 10.2.202.6	10.2.202.7
131	10.2.202.8/30	10.2.202.9 – 10.2.202.10	10.2.202.11
132	10.2.202.12/30	10.2.202.13 – 10.2.202.14	10.2.202.15
133	10.2.202.16/30	10.2.202.17 – 10.2.202.18	10.2.202.19
134	10.2.202.20/30	10.2.202.21 – 10.2.202.22	10.2.202.23
135	10.2.202.24/30	10.2.202.25 – 10.2.202.26	10.2.202.27
136	10.2.202.28/30	10.2.202.29 – 10.2.202.30	10.2.202.31
137	10.2.202.32/30	10.2.202.33 – 10.2.202.34	10.2.202.35
138	10.2.202.36/30	10.2.202.37 – 10.2.202.38	10.2.202.39
139	10.2.202.40/30	10.2.202.41 – 10.2.202.42	10.2.202.43
140	10.2.202.44/30	10.2.202.45 – 10.2.202.46	10.2.202.47
141	10.2.202.48/30	10.2.202.49 – 10.2.202.50	10.2.202.51
142	10.2.202.52/30	10.2.202.53 – 10.2.202.54	10.2.202.55
143	10.2.202.56/30	10.2.202.57 – 10.2.202.58	10.2.202.59
144	10.2.202.60/30	10.2.202.61 – 10.2.202.62	10.2.202.63
145	10.2.202.64/30	10.2.202.65 – 10.2.202.66	10.2.202.67
146	10.2.202.68/30	10.2.202.69 – 10.2.202.70	10.2.202.71
147	10.2.202.72/30	10.2.202.73 – 10.2.202.74	10.2.202.75
148	10.2.202.76/30	10.2.202.77 – 10.2.202.78	10.2.202.79
149	10.2.202.80/30	10.2.202.81 – 10.2.202.82	10.2.202.83
150	10.2.202.84/30	10.2.202.85 – 10.2.202.86	10.2.202.87
151	10.2.202.88/30	10.2.202.89 – 10.2.202.90	10.2.202.91
152	10.2.202.92/30	10.2.202.93 – 10.2.202.94	10.2.202.95
153	10.2.202.96/30	10.2.202.97 – 10.2.202.98	10.2.202.99
154	10.2.202.100/30	10.2.202.101 – 10.2.202.102	10.2.202.103
155	10.2.202.104/30	10.2.202.105 – 10.2.202.106	10.2.202.107
156	10.2.202.108/30	10.2.202.109 – 10.2.202.110	10.2.202.111
157	10.2.202.112/30	10.2.202.113 – 10.2.202.114	10.2.202.115
158	10.2.202.116/30	10.2.202.117 – 10.2.202.118	10.2.202.119
159	10.2.202.120/30	10.2.202.121 – 10.2.202.122	10.2.202.123
160	10.2.202.124/30	10.2.202.125 – 10.2.202.126	10.2.202.127
161	10.2.202.128/30	10.2.202.129 – 10.2.202.130	10.2.202.131
162	10.2.202.132/30	10.2.202.133 – 10.2.202.134	10.2.202.135
163	10.2.202.136/30	10.2.202.137 – 10.2.202.138	10.2.202.139
164	10.2.202.140/30	10.2.202.141 – 10.2.202.142	10.2.202.143
165	10.2.202.144/30	10.2.202.145 – 10.2.202.146	10.2.202.147
166	10.2.202.148/30	10.2.202.149 – 10.2.202.150	10.2.202.151
167	10.2.202.152/30	10.2.202.153 – 10.2.202.154	10.2.202.155
168	10.2.202.156/30	10.2.202.157 – 10.2.202.158	10.2.202.159
169	10.2.202.160/30	10.2.202.161 – 10.2.202.162	10.2.202.163
170	10.2.202.164/30	10.2.202.165 – 10.2.202.166	10.2.202.167
171	10.2.202.168/30	10.2.202.169 – 10.2.202.170	10.2.202.171
172	10.2.202.172/30	10.2.202.173 – 10.2.202.174	10.2.202.175
173	10.2.202.176/30	10.2.202.177 – 10.2.202.178	10.2.202.179
174	10.2.202.180/30	10.2.202.181 – 10.2.202.182	10.2.202.183
175	10.2.202.184/30	10.2.202.185 – 10.2.202.186	10.2.202.187
176	10.2.202.188/30	10.2.202.189 – 10.2.202.190	10.2.202.191
177	10.2.202.192/30	10.2.202.193 – 10.2.202.194	10.2.202.195
178	10.2.202.196/30	10.2.202.197 – 10.2.202.198	10.2.202.199
179	10.2.202.200/30	10.2.202.201 – 10.2.202.202	10.2.202.203
180	10.2.202.204/30	10.2.202.205 – 10.2.202.206	10.2.202.207
181	10.2.202.208/30	10.2.202.209 – 10.2.202.210	10.2.202.211
182	10.2.202.212/30	10.2.202.213 – 10.2.202.214	10.2.202.215
183	10.2.202.216/30	10.2.202.217 – 10.2.202.218	10.2.202.219
184	10.2.202.220/30	10.2.202.221 – 10.2.202.222	10.2.202.223
185	10.2.202.224/30	10.2.202.225 – 10.2.202.226	10.2.202.227
186	10.2.202.228/30	10.2.202.229 – 10.2.202.230	10.2.202.231
187	10.2.202.232/30	10.2.202.233 – 10.2.202.234	10.2.202.235
188	10.2.202.236/30	10.2.202.237 – 10.2.202.238	10.2.202.239
189	10.2.202.240/30	10.2.202.241 – 10.2.202.242	10.2.202.243
190	10.2.202.244/30	10.2.202.245 – 10.2.202.246	10.2.202.247
191	10.2.202.248/30	10.2.202.249 – 10.2.202.250	10.2.202.251
192	10.2.202.252/30	10.2.202.253 – 10.2.202.254	10.2.202.255
193	10.2.203.0/30	10.2.203.1 – 10.2.203.2	10.2.203.3
194	10.2.203.4/30	10.2.203.5 – 10.2.203.6	10.2.203.7
195	10.2.203.8/30	10.2.203.9 – 10.2.203.10	10.2.203.11
196	10.2.203.12/30	10.2.203.13 – 10.2.203.14	10.2.203.15
197	10.2.203.16/30	10.2.203.17 – 10.2.203.18	10.2.203.19
198	10.2.203.20/30	10.2.203.21 – 10.2.203.22	10.2.203.23
199	10.2.203.24/30	10.2.203.25 – 10.2.203.26	10.2.203.27
200	10.2.203.28/30	10.2.203.29 – 10.2.203.30	10.2.203.31
201	10.2.203.32/30	10.2.203.33 – 10.2.203.34	10.2.203.35
202	10.2.203.36/30	10.2.203.37 – 10.2.203.38	10.2.203.39
203	10.2.203.40/30	10.2.203.41 – 10.2.203.42	10.2.203.43
204	10.2.203.44/30	10.2.203.45 – 10.2.203.46	10.2.203.47
205	10.2.203.48/30	10.2.203.49 – 10.2.203.50	10.2.203.51
206	10.2.203.52/30	10.2.203.53 – 10.2.203.54	10.2.203.55
207	10.2.203.56/30	10.2.203.57 – 10.2.203.58	10.2.203.59
208	10.2.203.60/30	10.2.203.61 – 10.2.203.62	10.2.203.63
209	10.2.203.64/30	10.2.203.65 – 10.2.203.66	10.2.203.67
210	10.2.203.68/30	10.2.203.69 – 10.2.203.70	10.2.203.71
211	10.2.203.72/30	10.2.203.73 – 10.2.203.74	10.2.203.75
212	10.2.203.76/30	10.2.203.77 – 10.2.203.78	10.2.203.79
213	10.2.203.80/30	10.2.203.81 – 10.2.203.82	10.2.203.83
214	10.2.203.84/30	10.2.203.85 – 10.2.203.86	10.2.203.87
215	10.2.203.88/30	10.2.203.89 – 10.2.203.90	10.2.203.91
216	10.2.203.92/30	10.2.203.93 – 10.2.203.94	10.2.203.95
217	10.2.203.96/30	10.2.203.97 – 10.2.203.98	10.2.203.99
218	10.2.203.100/30	10.2.203.101 – 10.2.203.102	10.2.203.103
219	10.2.203.104/30	10.2.203.105 – 10.2.203.106	10.2.203.107
220	10.2.203.108/30	10.2.203.109 – 10.2.203.110	10.2.203.111
221	10.2.203.112/30	10.2.203.113 – 10.2.203.114	10.2.203.115
222	10.2.203.116/30	10.2.203.117 – 10.2.203.118	10.2.203.119
223	10.2.203.120/30	10.2.203.121 – 10.2.203.122	10.2.203.123
224	10.2.203.124/30	10.2.203.125 – 10.2.203.126	10.2.203.127
225	10.2.203.128/30	10.2.203.129 – 10.2.203.130	10.2.203.131
226	10.2.203.132/30	10.2.203.133 – 10.2.203.134	10.2.203.135
227	10.2.203.136/30	10.2.203.137 – 10.2.203.138	10.2.203.139
228	10.2.203.140/30	10.2.203.141 – 10.2.203.142	10.2.203.143
229	10.2.203.144/30	10.2.203.145 – 10.2.203.146	10.2.203.147
230	10.2.203.148/30	10.2.203.149 – 10.2.203.150	10.2.203.151
231	10.2.203.152/30	10.2.203.153 – 10.2.203.154	10.2.203.155
232	10.2.203.156/30	10.2.203.157 – 10.2.203.158	10.2.203.159
233	10.2.203.160/30	10.2.203.161 – 10.2.203.162	10.2.203.163
234	10.2.203.164/30	10.2.203.165 – 10.2.203.166	10.2.203.167
235	10.2.203.168/30	10.2.203.169 – 10.2.203.170	10.2.203.171
236	10.2.203.172/30	10.2.203.173 – 10.2.203.174	10.2.203.175
237	10.2.203.176/30	10.2.203.177 – 10.2.203.178	10.2.203.179
238	10.2.203.180/30	10.2.203.181 – 10.2.203.182	10.2.203.183
239	10.2.203.184/30	10.2.203.185 – 10.2.203.186	10.2.203.187
240	10.2.203.188/30	10.2.203.189 – 10.2.203.190	10.2.203.191
241	10.2.203.192/30	10.2.203.193 – 10.2.203.194	10.2.203.195
242	10.2.203.196/30	10.2.203.197 – 10.2.203.198	10.2.203.199
243	10.2.203.200/30	10.2.203.201 – 10.2.203.202	10.2.203.203
244	10.2.203.204/30	10.2.203.205 – 10.2.203.206	10.2.203.207
245	10.2.203.208/30	10.2.203.209 – 10.2.203.210	10.2.203.211
246	10.2.203.212/30	10.2.203.213 – 10.2.203.214	10.2.203.215
247	10.2.203.216/30	10.2.203.217 – 10.2.203.218	10.2.203.219
248	10.2.203.220/30	10.2.203.221 – 10.2.203.222	10.2.203.223
249	10.2.203.224/30	10.2.203.225 – 10.2.203.226	10.2.203.227
250	10.2.203.228/30	10.2.203.229 – 10.2.203.230	10.2.203.231
251	10.2.203.232/30	10.2.203.233 – 10.2.203.234	10.2.203.235
252	10.2.203.236/30	10.2.203.237 – 10.2.203.238	10.2.203.239
253	10.2.203.240/30	10.2.203.241 – 10.2.203.242	10.2.203.243
254	10.2.203.244/30	10.2.203.245 – 10.2.203.246	10.2.203.247
255	10.2.203.248/30	10.2.203.249 – 10.2.203.250	10.2.203.251
256	10.2.203.252/30	10.2.203.253 – 10.2.203.254	10.2.203.255

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 →