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)10.4.88.0/21

network10.4.88.0/21

broadcast10.4.95.255

first host10.4.88.1

last host10.4.95.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.88.0/21

address00001010.00000100.01011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.01011000.00000000

broadcast00001010.00000100.01011111.11111111

green = network part, grey = host part

hex0x0a045800

decimal168056832

reverse dns0.88.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:5800

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.4.88.0/29	10.4.88.1 – 10.4.88.6	10.4.88.7
2	10.4.88.8/29	10.4.88.9 – 10.4.88.14	10.4.88.15
3	10.4.88.16/29	10.4.88.17 – 10.4.88.22	10.4.88.23
4	10.4.88.24/29	10.4.88.25 – 10.4.88.30	10.4.88.31
5	10.4.88.32/29	10.4.88.33 – 10.4.88.38	10.4.88.39
6	10.4.88.40/29	10.4.88.41 – 10.4.88.46	10.4.88.47
7	10.4.88.48/29	10.4.88.49 – 10.4.88.54	10.4.88.55
8	10.4.88.56/29	10.4.88.57 – 10.4.88.62	10.4.88.63
9	10.4.88.64/29	10.4.88.65 – 10.4.88.70	10.4.88.71
10	10.4.88.72/29	10.4.88.73 – 10.4.88.78	10.4.88.79
11	10.4.88.80/29	10.4.88.81 – 10.4.88.86	10.4.88.87
12	10.4.88.88/29	10.4.88.89 – 10.4.88.94	10.4.88.95
13	10.4.88.96/29	10.4.88.97 – 10.4.88.102	10.4.88.103
14	10.4.88.104/29	10.4.88.105 – 10.4.88.110	10.4.88.111
15	10.4.88.112/29	10.4.88.113 – 10.4.88.118	10.4.88.119
16	10.4.88.120/29	10.4.88.121 – 10.4.88.126	10.4.88.127
17	10.4.88.128/29	10.4.88.129 – 10.4.88.134	10.4.88.135
18	10.4.88.136/29	10.4.88.137 – 10.4.88.142	10.4.88.143
19	10.4.88.144/29	10.4.88.145 – 10.4.88.150	10.4.88.151
20	10.4.88.152/29	10.4.88.153 – 10.4.88.158	10.4.88.159
21	10.4.88.160/29	10.4.88.161 – 10.4.88.166	10.4.88.167
22	10.4.88.168/29	10.4.88.169 – 10.4.88.174	10.4.88.175
23	10.4.88.176/29	10.4.88.177 – 10.4.88.182	10.4.88.183
24	10.4.88.184/29	10.4.88.185 – 10.4.88.190	10.4.88.191
25	10.4.88.192/29	10.4.88.193 – 10.4.88.198	10.4.88.199
26	10.4.88.200/29	10.4.88.201 – 10.4.88.206	10.4.88.207
27	10.4.88.208/29	10.4.88.209 – 10.4.88.214	10.4.88.215
28	10.4.88.216/29	10.4.88.217 – 10.4.88.222	10.4.88.223
29	10.4.88.224/29	10.4.88.225 – 10.4.88.230	10.4.88.231
30	10.4.88.232/29	10.4.88.233 – 10.4.88.238	10.4.88.239
31	10.4.88.240/29	10.4.88.241 – 10.4.88.246	10.4.88.247
32	10.4.88.248/29	10.4.88.249 – 10.4.88.254	10.4.88.255
33	10.4.89.0/29	10.4.89.1 – 10.4.89.6	10.4.89.7
34	10.4.89.8/29	10.4.89.9 – 10.4.89.14	10.4.89.15
35	10.4.89.16/29	10.4.89.17 – 10.4.89.22	10.4.89.23
36	10.4.89.24/29	10.4.89.25 – 10.4.89.30	10.4.89.31
37	10.4.89.32/29	10.4.89.33 – 10.4.89.38	10.4.89.39
38	10.4.89.40/29	10.4.89.41 – 10.4.89.46	10.4.89.47
39	10.4.89.48/29	10.4.89.49 – 10.4.89.54	10.4.89.55
40	10.4.89.56/29	10.4.89.57 – 10.4.89.62	10.4.89.63
41	10.4.89.64/29	10.4.89.65 – 10.4.89.70	10.4.89.71
42	10.4.89.72/29	10.4.89.73 – 10.4.89.78	10.4.89.79
43	10.4.89.80/29	10.4.89.81 – 10.4.89.86	10.4.89.87
44	10.4.89.88/29	10.4.89.89 – 10.4.89.94	10.4.89.95
45	10.4.89.96/29	10.4.89.97 – 10.4.89.102	10.4.89.103
46	10.4.89.104/29	10.4.89.105 – 10.4.89.110	10.4.89.111
47	10.4.89.112/29	10.4.89.113 – 10.4.89.118	10.4.89.119
48	10.4.89.120/29	10.4.89.121 – 10.4.89.126	10.4.89.127
49	10.4.89.128/29	10.4.89.129 – 10.4.89.134	10.4.89.135
50	10.4.89.136/29	10.4.89.137 – 10.4.89.142	10.4.89.143
51	10.4.89.144/29	10.4.89.145 – 10.4.89.150	10.4.89.151
52	10.4.89.152/29	10.4.89.153 – 10.4.89.158	10.4.89.159
53	10.4.89.160/29	10.4.89.161 – 10.4.89.166	10.4.89.167
54	10.4.89.168/29	10.4.89.169 – 10.4.89.174	10.4.89.175
55	10.4.89.176/29	10.4.89.177 – 10.4.89.182	10.4.89.183
56	10.4.89.184/29	10.4.89.185 – 10.4.89.190	10.4.89.191
57	10.4.89.192/29	10.4.89.193 – 10.4.89.198	10.4.89.199
58	10.4.89.200/29	10.4.89.201 – 10.4.89.206	10.4.89.207
59	10.4.89.208/29	10.4.89.209 – 10.4.89.214	10.4.89.215
60	10.4.89.216/29	10.4.89.217 – 10.4.89.222	10.4.89.223
61	10.4.89.224/29	10.4.89.225 – 10.4.89.230	10.4.89.231
62	10.4.89.232/29	10.4.89.233 – 10.4.89.238	10.4.89.239
63	10.4.89.240/29	10.4.89.241 – 10.4.89.246	10.4.89.247
64	10.4.89.248/29	10.4.89.249 – 10.4.89.254	10.4.89.255
65	10.4.90.0/29	10.4.90.1 – 10.4.90.6	10.4.90.7
66	10.4.90.8/29	10.4.90.9 – 10.4.90.14	10.4.90.15
67	10.4.90.16/29	10.4.90.17 – 10.4.90.22	10.4.90.23
68	10.4.90.24/29	10.4.90.25 – 10.4.90.30	10.4.90.31
69	10.4.90.32/29	10.4.90.33 – 10.4.90.38	10.4.90.39
70	10.4.90.40/29	10.4.90.41 – 10.4.90.46	10.4.90.47
71	10.4.90.48/29	10.4.90.49 – 10.4.90.54	10.4.90.55
72	10.4.90.56/29	10.4.90.57 – 10.4.90.62	10.4.90.63
73	10.4.90.64/29	10.4.90.65 – 10.4.90.70	10.4.90.71
74	10.4.90.72/29	10.4.90.73 – 10.4.90.78	10.4.90.79
75	10.4.90.80/29	10.4.90.81 – 10.4.90.86	10.4.90.87
76	10.4.90.88/29	10.4.90.89 – 10.4.90.94	10.4.90.95
77	10.4.90.96/29	10.4.90.97 – 10.4.90.102	10.4.90.103
78	10.4.90.104/29	10.4.90.105 – 10.4.90.110	10.4.90.111
79	10.4.90.112/29	10.4.90.113 – 10.4.90.118	10.4.90.119
80	10.4.90.120/29	10.4.90.121 – 10.4.90.126	10.4.90.127
81	10.4.90.128/29	10.4.90.129 – 10.4.90.134	10.4.90.135
82	10.4.90.136/29	10.4.90.137 – 10.4.90.142	10.4.90.143
83	10.4.90.144/29	10.4.90.145 – 10.4.90.150	10.4.90.151
84	10.4.90.152/29	10.4.90.153 – 10.4.90.158	10.4.90.159
85	10.4.90.160/29	10.4.90.161 – 10.4.90.166	10.4.90.167
86	10.4.90.168/29	10.4.90.169 – 10.4.90.174	10.4.90.175
87	10.4.90.176/29	10.4.90.177 – 10.4.90.182	10.4.90.183
88	10.4.90.184/29	10.4.90.185 – 10.4.90.190	10.4.90.191
89	10.4.90.192/29	10.4.90.193 – 10.4.90.198	10.4.90.199
90	10.4.90.200/29	10.4.90.201 – 10.4.90.206	10.4.90.207
91	10.4.90.208/29	10.4.90.209 – 10.4.90.214	10.4.90.215
92	10.4.90.216/29	10.4.90.217 – 10.4.90.222	10.4.90.223
93	10.4.90.224/29	10.4.90.225 – 10.4.90.230	10.4.90.231
94	10.4.90.232/29	10.4.90.233 – 10.4.90.238	10.4.90.239
95	10.4.90.240/29	10.4.90.241 – 10.4.90.246	10.4.90.247
96	10.4.90.248/29	10.4.90.249 – 10.4.90.254	10.4.90.255
97	10.4.91.0/29	10.4.91.1 – 10.4.91.6	10.4.91.7
98	10.4.91.8/29	10.4.91.9 – 10.4.91.14	10.4.91.15
99	10.4.91.16/29	10.4.91.17 – 10.4.91.22	10.4.91.23
100	10.4.91.24/29	10.4.91.25 – 10.4.91.30	10.4.91.31
101	10.4.91.32/29	10.4.91.33 – 10.4.91.38	10.4.91.39
102	10.4.91.40/29	10.4.91.41 – 10.4.91.46	10.4.91.47
103	10.4.91.48/29	10.4.91.49 – 10.4.91.54	10.4.91.55
104	10.4.91.56/29	10.4.91.57 – 10.4.91.62	10.4.91.63
105	10.4.91.64/29	10.4.91.65 – 10.4.91.70	10.4.91.71
106	10.4.91.72/29	10.4.91.73 – 10.4.91.78	10.4.91.79
107	10.4.91.80/29	10.4.91.81 – 10.4.91.86	10.4.91.87
108	10.4.91.88/29	10.4.91.89 – 10.4.91.94	10.4.91.95
109	10.4.91.96/29	10.4.91.97 – 10.4.91.102	10.4.91.103
110	10.4.91.104/29	10.4.91.105 – 10.4.91.110	10.4.91.111
111	10.4.91.112/29	10.4.91.113 – 10.4.91.118	10.4.91.119
112	10.4.91.120/29	10.4.91.121 – 10.4.91.126	10.4.91.127
113	10.4.91.128/29	10.4.91.129 – 10.4.91.134	10.4.91.135
114	10.4.91.136/29	10.4.91.137 – 10.4.91.142	10.4.91.143
115	10.4.91.144/29	10.4.91.145 – 10.4.91.150	10.4.91.151
116	10.4.91.152/29	10.4.91.153 – 10.4.91.158	10.4.91.159
117	10.4.91.160/29	10.4.91.161 – 10.4.91.166	10.4.91.167
118	10.4.91.168/29	10.4.91.169 – 10.4.91.174	10.4.91.175
119	10.4.91.176/29	10.4.91.177 – 10.4.91.182	10.4.91.183
120	10.4.91.184/29	10.4.91.185 – 10.4.91.190	10.4.91.191
121	10.4.91.192/29	10.4.91.193 – 10.4.91.198	10.4.91.199
122	10.4.91.200/29	10.4.91.201 – 10.4.91.206	10.4.91.207
123	10.4.91.208/29	10.4.91.209 – 10.4.91.214	10.4.91.215
124	10.4.91.216/29	10.4.91.217 – 10.4.91.222	10.4.91.223
125	10.4.91.224/29	10.4.91.225 – 10.4.91.230	10.4.91.231
126	10.4.91.232/29	10.4.91.233 – 10.4.91.238	10.4.91.239
127	10.4.91.240/29	10.4.91.241 – 10.4.91.246	10.4.91.247
128	10.4.91.248/29	10.4.91.249 – 10.4.91.254	10.4.91.255
129	10.4.92.0/29	10.4.92.1 – 10.4.92.6	10.4.92.7
130	10.4.92.8/29	10.4.92.9 – 10.4.92.14	10.4.92.15
131	10.4.92.16/29	10.4.92.17 – 10.4.92.22	10.4.92.23
132	10.4.92.24/29	10.4.92.25 – 10.4.92.30	10.4.92.31
133	10.4.92.32/29	10.4.92.33 – 10.4.92.38	10.4.92.39
134	10.4.92.40/29	10.4.92.41 – 10.4.92.46	10.4.92.47
135	10.4.92.48/29	10.4.92.49 – 10.4.92.54	10.4.92.55
136	10.4.92.56/29	10.4.92.57 – 10.4.92.62	10.4.92.63
137	10.4.92.64/29	10.4.92.65 – 10.4.92.70	10.4.92.71
138	10.4.92.72/29	10.4.92.73 – 10.4.92.78	10.4.92.79
139	10.4.92.80/29	10.4.92.81 – 10.4.92.86	10.4.92.87
140	10.4.92.88/29	10.4.92.89 – 10.4.92.94	10.4.92.95
141	10.4.92.96/29	10.4.92.97 – 10.4.92.102	10.4.92.103
142	10.4.92.104/29	10.4.92.105 – 10.4.92.110	10.4.92.111
143	10.4.92.112/29	10.4.92.113 – 10.4.92.118	10.4.92.119
144	10.4.92.120/29	10.4.92.121 – 10.4.92.126	10.4.92.127
145	10.4.92.128/29	10.4.92.129 – 10.4.92.134	10.4.92.135
146	10.4.92.136/29	10.4.92.137 – 10.4.92.142	10.4.92.143
147	10.4.92.144/29	10.4.92.145 – 10.4.92.150	10.4.92.151
148	10.4.92.152/29	10.4.92.153 – 10.4.92.158	10.4.92.159
149	10.4.92.160/29	10.4.92.161 – 10.4.92.166	10.4.92.167
150	10.4.92.168/29	10.4.92.169 – 10.4.92.174	10.4.92.175
151	10.4.92.176/29	10.4.92.177 – 10.4.92.182	10.4.92.183
152	10.4.92.184/29	10.4.92.185 – 10.4.92.190	10.4.92.191
153	10.4.92.192/29	10.4.92.193 – 10.4.92.198	10.4.92.199
154	10.4.92.200/29	10.4.92.201 – 10.4.92.206	10.4.92.207
155	10.4.92.208/29	10.4.92.209 – 10.4.92.214	10.4.92.215
156	10.4.92.216/29	10.4.92.217 – 10.4.92.222	10.4.92.223
157	10.4.92.224/29	10.4.92.225 – 10.4.92.230	10.4.92.231
158	10.4.92.232/29	10.4.92.233 – 10.4.92.238	10.4.92.239
159	10.4.92.240/29	10.4.92.241 – 10.4.92.246	10.4.92.247
160	10.4.92.248/29	10.4.92.249 – 10.4.92.254	10.4.92.255
161	10.4.93.0/29	10.4.93.1 – 10.4.93.6	10.4.93.7
162	10.4.93.8/29	10.4.93.9 – 10.4.93.14	10.4.93.15
163	10.4.93.16/29	10.4.93.17 – 10.4.93.22	10.4.93.23
164	10.4.93.24/29	10.4.93.25 – 10.4.93.30	10.4.93.31
165	10.4.93.32/29	10.4.93.33 – 10.4.93.38	10.4.93.39
166	10.4.93.40/29	10.4.93.41 – 10.4.93.46	10.4.93.47
167	10.4.93.48/29	10.4.93.49 – 10.4.93.54	10.4.93.55
168	10.4.93.56/29	10.4.93.57 – 10.4.93.62	10.4.93.63
169	10.4.93.64/29	10.4.93.65 – 10.4.93.70	10.4.93.71
170	10.4.93.72/29	10.4.93.73 – 10.4.93.78	10.4.93.79
171	10.4.93.80/29	10.4.93.81 – 10.4.93.86	10.4.93.87
172	10.4.93.88/29	10.4.93.89 – 10.4.93.94	10.4.93.95
173	10.4.93.96/29	10.4.93.97 – 10.4.93.102	10.4.93.103
174	10.4.93.104/29	10.4.93.105 – 10.4.93.110	10.4.93.111
175	10.4.93.112/29	10.4.93.113 – 10.4.93.118	10.4.93.119
176	10.4.93.120/29	10.4.93.121 – 10.4.93.126	10.4.93.127
177	10.4.93.128/29	10.4.93.129 – 10.4.93.134	10.4.93.135
178	10.4.93.136/29	10.4.93.137 – 10.4.93.142	10.4.93.143
179	10.4.93.144/29	10.4.93.145 – 10.4.93.150	10.4.93.151
180	10.4.93.152/29	10.4.93.153 – 10.4.93.158	10.4.93.159
181	10.4.93.160/29	10.4.93.161 – 10.4.93.166	10.4.93.167
182	10.4.93.168/29	10.4.93.169 – 10.4.93.174	10.4.93.175
183	10.4.93.176/29	10.4.93.177 – 10.4.93.182	10.4.93.183
184	10.4.93.184/29	10.4.93.185 – 10.4.93.190	10.4.93.191
185	10.4.93.192/29	10.4.93.193 – 10.4.93.198	10.4.93.199
186	10.4.93.200/29	10.4.93.201 – 10.4.93.206	10.4.93.207
187	10.4.93.208/29	10.4.93.209 – 10.4.93.214	10.4.93.215
188	10.4.93.216/29	10.4.93.217 – 10.4.93.222	10.4.93.223
189	10.4.93.224/29	10.4.93.225 – 10.4.93.230	10.4.93.231
190	10.4.93.232/29	10.4.93.233 – 10.4.93.238	10.4.93.239
191	10.4.93.240/29	10.4.93.241 – 10.4.93.246	10.4.93.247
192	10.4.93.248/29	10.4.93.249 – 10.4.93.254	10.4.93.255
193	10.4.94.0/29	10.4.94.1 – 10.4.94.6	10.4.94.7
194	10.4.94.8/29	10.4.94.9 – 10.4.94.14	10.4.94.15
195	10.4.94.16/29	10.4.94.17 – 10.4.94.22	10.4.94.23
196	10.4.94.24/29	10.4.94.25 – 10.4.94.30	10.4.94.31
197	10.4.94.32/29	10.4.94.33 – 10.4.94.38	10.4.94.39
198	10.4.94.40/29	10.4.94.41 – 10.4.94.46	10.4.94.47
199	10.4.94.48/29	10.4.94.49 – 10.4.94.54	10.4.94.55
200	10.4.94.56/29	10.4.94.57 – 10.4.94.62	10.4.94.63
201	10.4.94.64/29	10.4.94.65 – 10.4.94.70	10.4.94.71
202	10.4.94.72/29	10.4.94.73 – 10.4.94.78	10.4.94.79
203	10.4.94.80/29	10.4.94.81 – 10.4.94.86	10.4.94.87
204	10.4.94.88/29	10.4.94.89 – 10.4.94.94	10.4.94.95
205	10.4.94.96/29	10.4.94.97 – 10.4.94.102	10.4.94.103
206	10.4.94.104/29	10.4.94.105 – 10.4.94.110	10.4.94.111
207	10.4.94.112/29	10.4.94.113 – 10.4.94.118	10.4.94.119
208	10.4.94.120/29	10.4.94.121 – 10.4.94.126	10.4.94.127
209	10.4.94.128/29	10.4.94.129 – 10.4.94.134	10.4.94.135
210	10.4.94.136/29	10.4.94.137 – 10.4.94.142	10.4.94.143
211	10.4.94.144/29	10.4.94.145 – 10.4.94.150	10.4.94.151
212	10.4.94.152/29	10.4.94.153 – 10.4.94.158	10.4.94.159
213	10.4.94.160/29	10.4.94.161 – 10.4.94.166	10.4.94.167
214	10.4.94.168/29	10.4.94.169 – 10.4.94.174	10.4.94.175
215	10.4.94.176/29	10.4.94.177 – 10.4.94.182	10.4.94.183
216	10.4.94.184/29	10.4.94.185 – 10.4.94.190	10.4.94.191
217	10.4.94.192/29	10.4.94.193 – 10.4.94.198	10.4.94.199
218	10.4.94.200/29	10.4.94.201 – 10.4.94.206	10.4.94.207
219	10.4.94.208/29	10.4.94.209 – 10.4.94.214	10.4.94.215
220	10.4.94.216/29	10.4.94.217 – 10.4.94.222	10.4.94.223
221	10.4.94.224/29	10.4.94.225 – 10.4.94.230	10.4.94.231
222	10.4.94.232/29	10.4.94.233 – 10.4.94.238	10.4.94.239
223	10.4.94.240/29	10.4.94.241 – 10.4.94.246	10.4.94.247
224	10.4.94.248/29	10.4.94.249 – 10.4.94.254	10.4.94.255
225	10.4.95.0/29	10.4.95.1 – 10.4.95.6	10.4.95.7
226	10.4.95.8/29	10.4.95.9 – 10.4.95.14	10.4.95.15
227	10.4.95.16/29	10.4.95.17 – 10.4.95.22	10.4.95.23
228	10.4.95.24/29	10.4.95.25 – 10.4.95.30	10.4.95.31
229	10.4.95.32/29	10.4.95.33 – 10.4.95.38	10.4.95.39
230	10.4.95.40/29	10.4.95.41 – 10.4.95.46	10.4.95.47
231	10.4.95.48/29	10.4.95.49 – 10.4.95.54	10.4.95.55
232	10.4.95.56/29	10.4.95.57 – 10.4.95.62	10.4.95.63
233	10.4.95.64/29	10.4.95.65 – 10.4.95.70	10.4.95.71
234	10.4.95.72/29	10.4.95.73 – 10.4.95.78	10.4.95.79
235	10.4.95.80/29	10.4.95.81 – 10.4.95.86	10.4.95.87
236	10.4.95.88/29	10.4.95.89 – 10.4.95.94	10.4.95.95
237	10.4.95.96/29	10.4.95.97 – 10.4.95.102	10.4.95.103
238	10.4.95.104/29	10.4.95.105 – 10.4.95.110	10.4.95.111
239	10.4.95.112/29	10.4.95.113 – 10.4.95.118	10.4.95.119
240	10.4.95.120/29	10.4.95.121 – 10.4.95.126	10.4.95.127
241	10.4.95.128/29	10.4.95.129 – 10.4.95.134	10.4.95.135
242	10.4.95.136/29	10.4.95.137 – 10.4.95.142	10.4.95.143
243	10.4.95.144/29	10.4.95.145 – 10.4.95.150	10.4.95.151
244	10.4.95.152/29	10.4.95.153 – 10.4.95.158	10.4.95.159
245	10.4.95.160/29	10.4.95.161 – 10.4.95.166	10.4.95.167
246	10.4.95.168/29	10.4.95.169 – 10.4.95.174	10.4.95.175
247	10.4.95.176/29	10.4.95.177 – 10.4.95.182	10.4.95.183
248	10.4.95.184/29	10.4.95.185 – 10.4.95.190	10.4.95.191
249	10.4.95.192/29	10.4.95.193 – 10.4.95.198	10.4.95.199
250	10.4.95.200/29	10.4.95.201 – 10.4.95.206	10.4.95.207
251	10.4.95.208/29	10.4.95.209 – 10.4.95.214	10.4.95.215
252	10.4.95.216/29	10.4.95.217 – 10.4.95.222	10.4.95.223
253	10.4.95.224/29	10.4.95.225 – 10.4.95.230	10.4.95.231
254	10.4.95.232/29	10.4.95.233 – 10.4.95.238	10.4.95.239
255	10.4.95.240/29	10.4.95.241 – 10.4.95.246	10.4.95.247
256	10.4.95.248/29	10.4.95.249 – 10.4.95.254	10.4.95.255

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 →