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)10.31.0.0/19

network10.31.0.0/19

broadcast10.31.31.255

first host10.31.0.1

last host10.31.31.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.31.0.0/19

address00001010.00011111.00000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00011111.00000000.00000000

broadcast00001010.00011111.00011111.11111111

green = network part, grey = host part

hex0x0a1f0000

decimal169803776

reverse dns0.0.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:0

/19 split into /28 · 512 subnets

close ×

#	network	host range	broadcast
1	10.31.0.0/28	10.31.0.1 – 10.31.0.14	10.31.0.15
2	10.31.0.16/28	10.31.0.17 – 10.31.0.30	10.31.0.31
3	10.31.0.32/28	10.31.0.33 – 10.31.0.46	10.31.0.47
4	10.31.0.48/28	10.31.0.49 – 10.31.0.62	10.31.0.63
5	10.31.0.64/28	10.31.0.65 – 10.31.0.78	10.31.0.79
6	10.31.0.80/28	10.31.0.81 – 10.31.0.94	10.31.0.95
7	10.31.0.96/28	10.31.0.97 – 10.31.0.110	10.31.0.111
8	10.31.0.112/28	10.31.0.113 – 10.31.0.126	10.31.0.127
9	10.31.0.128/28	10.31.0.129 – 10.31.0.142	10.31.0.143
10	10.31.0.144/28	10.31.0.145 – 10.31.0.158	10.31.0.159
11	10.31.0.160/28	10.31.0.161 – 10.31.0.174	10.31.0.175
12	10.31.0.176/28	10.31.0.177 – 10.31.0.190	10.31.0.191
13	10.31.0.192/28	10.31.0.193 – 10.31.0.206	10.31.0.207
14	10.31.0.208/28	10.31.0.209 – 10.31.0.222	10.31.0.223
15	10.31.0.224/28	10.31.0.225 – 10.31.0.238	10.31.0.239
16	10.31.0.240/28	10.31.0.241 – 10.31.0.254	10.31.0.255
17	10.31.1.0/28	10.31.1.1 – 10.31.1.14	10.31.1.15
18	10.31.1.16/28	10.31.1.17 – 10.31.1.30	10.31.1.31
19	10.31.1.32/28	10.31.1.33 – 10.31.1.46	10.31.1.47
20	10.31.1.48/28	10.31.1.49 – 10.31.1.62	10.31.1.63
21	10.31.1.64/28	10.31.1.65 – 10.31.1.78	10.31.1.79
22	10.31.1.80/28	10.31.1.81 – 10.31.1.94	10.31.1.95
23	10.31.1.96/28	10.31.1.97 – 10.31.1.110	10.31.1.111
24	10.31.1.112/28	10.31.1.113 – 10.31.1.126	10.31.1.127
25	10.31.1.128/28	10.31.1.129 – 10.31.1.142	10.31.1.143
26	10.31.1.144/28	10.31.1.145 – 10.31.1.158	10.31.1.159
27	10.31.1.160/28	10.31.1.161 – 10.31.1.174	10.31.1.175
28	10.31.1.176/28	10.31.1.177 – 10.31.1.190	10.31.1.191
29	10.31.1.192/28	10.31.1.193 – 10.31.1.206	10.31.1.207
30	10.31.1.208/28	10.31.1.209 – 10.31.1.222	10.31.1.223
31	10.31.1.224/28	10.31.1.225 – 10.31.1.238	10.31.1.239
32	10.31.1.240/28	10.31.1.241 – 10.31.1.254	10.31.1.255
33	10.31.2.0/28	10.31.2.1 – 10.31.2.14	10.31.2.15
34	10.31.2.16/28	10.31.2.17 – 10.31.2.30	10.31.2.31
35	10.31.2.32/28	10.31.2.33 – 10.31.2.46	10.31.2.47
36	10.31.2.48/28	10.31.2.49 – 10.31.2.62	10.31.2.63
37	10.31.2.64/28	10.31.2.65 – 10.31.2.78	10.31.2.79
38	10.31.2.80/28	10.31.2.81 – 10.31.2.94	10.31.2.95
39	10.31.2.96/28	10.31.2.97 – 10.31.2.110	10.31.2.111
40	10.31.2.112/28	10.31.2.113 – 10.31.2.126	10.31.2.127
41	10.31.2.128/28	10.31.2.129 – 10.31.2.142	10.31.2.143
42	10.31.2.144/28	10.31.2.145 – 10.31.2.158	10.31.2.159
43	10.31.2.160/28	10.31.2.161 – 10.31.2.174	10.31.2.175
44	10.31.2.176/28	10.31.2.177 – 10.31.2.190	10.31.2.191
45	10.31.2.192/28	10.31.2.193 – 10.31.2.206	10.31.2.207
46	10.31.2.208/28	10.31.2.209 – 10.31.2.222	10.31.2.223
47	10.31.2.224/28	10.31.2.225 – 10.31.2.238	10.31.2.239
48	10.31.2.240/28	10.31.2.241 – 10.31.2.254	10.31.2.255
49	10.31.3.0/28	10.31.3.1 – 10.31.3.14	10.31.3.15
50	10.31.3.16/28	10.31.3.17 – 10.31.3.30	10.31.3.31
51	10.31.3.32/28	10.31.3.33 – 10.31.3.46	10.31.3.47
52	10.31.3.48/28	10.31.3.49 – 10.31.3.62	10.31.3.63
53	10.31.3.64/28	10.31.3.65 – 10.31.3.78	10.31.3.79
54	10.31.3.80/28	10.31.3.81 – 10.31.3.94	10.31.3.95
55	10.31.3.96/28	10.31.3.97 – 10.31.3.110	10.31.3.111
56	10.31.3.112/28	10.31.3.113 – 10.31.3.126	10.31.3.127
57	10.31.3.128/28	10.31.3.129 – 10.31.3.142	10.31.3.143
58	10.31.3.144/28	10.31.3.145 – 10.31.3.158	10.31.3.159
59	10.31.3.160/28	10.31.3.161 – 10.31.3.174	10.31.3.175
60	10.31.3.176/28	10.31.3.177 – 10.31.3.190	10.31.3.191
61	10.31.3.192/28	10.31.3.193 – 10.31.3.206	10.31.3.207
62	10.31.3.208/28	10.31.3.209 – 10.31.3.222	10.31.3.223
63	10.31.3.224/28	10.31.3.225 – 10.31.3.238	10.31.3.239
64	10.31.3.240/28	10.31.3.241 – 10.31.3.254	10.31.3.255
65	10.31.4.0/28	10.31.4.1 – 10.31.4.14	10.31.4.15
66	10.31.4.16/28	10.31.4.17 – 10.31.4.30	10.31.4.31
67	10.31.4.32/28	10.31.4.33 – 10.31.4.46	10.31.4.47
68	10.31.4.48/28	10.31.4.49 – 10.31.4.62	10.31.4.63
69	10.31.4.64/28	10.31.4.65 – 10.31.4.78	10.31.4.79
70	10.31.4.80/28	10.31.4.81 – 10.31.4.94	10.31.4.95
71	10.31.4.96/28	10.31.4.97 – 10.31.4.110	10.31.4.111
72	10.31.4.112/28	10.31.4.113 – 10.31.4.126	10.31.4.127
73	10.31.4.128/28	10.31.4.129 – 10.31.4.142	10.31.4.143
74	10.31.4.144/28	10.31.4.145 – 10.31.4.158	10.31.4.159
75	10.31.4.160/28	10.31.4.161 – 10.31.4.174	10.31.4.175
76	10.31.4.176/28	10.31.4.177 – 10.31.4.190	10.31.4.191
77	10.31.4.192/28	10.31.4.193 – 10.31.4.206	10.31.4.207
78	10.31.4.208/28	10.31.4.209 – 10.31.4.222	10.31.4.223
79	10.31.4.224/28	10.31.4.225 – 10.31.4.238	10.31.4.239
80	10.31.4.240/28	10.31.4.241 – 10.31.4.254	10.31.4.255
81	10.31.5.0/28	10.31.5.1 – 10.31.5.14	10.31.5.15
82	10.31.5.16/28	10.31.5.17 – 10.31.5.30	10.31.5.31
83	10.31.5.32/28	10.31.5.33 – 10.31.5.46	10.31.5.47
84	10.31.5.48/28	10.31.5.49 – 10.31.5.62	10.31.5.63
85	10.31.5.64/28	10.31.5.65 – 10.31.5.78	10.31.5.79
86	10.31.5.80/28	10.31.5.81 – 10.31.5.94	10.31.5.95
87	10.31.5.96/28	10.31.5.97 – 10.31.5.110	10.31.5.111
88	10.31.5.112/28	10.31.5.113 – 10.31.5.126	10.31.5.127
89	10.31.5.128/28	10.31.5.129 – 10.31.5.142	10.31.5.143
90	10.31.5.144/28	10.31.5.145 – 10.31.5.158	10.31.5.159
91	10.31.5.160/28	10.31.5.161 – 10.31.5.174	10.31.5.175
92	10.31.5.176/28	10.31.5.177 – 10.31.5.190	10.31.5.191
93	10.31.5.192/28	10.31.5.193 – 10.31.5.206	10.31.5.207
94	10.31.5.208/28	10.31.5.209 – 10.31.5.222	10.31.5.223
95	10.31.5.224/28	10.31.5.225 – 10.31.5.238	10.31.5.239
96	10.31.5.240/28	10.31.5.241 – 10.31.5.254	10.31.5.255
97	10.31.6.0/28	10.31.6.1 – 10.31.6.14	10.31.6.15
98	10.31.6.16/28	10.31.6.17 – 10.31.6.30	10.31.6.31
99	10.31.6.32/28	10.31.6.33 – 10.31.6.46	10.31.6.47
100	10.31.6.48/28	10.31.6.49 – 10.31.6.62	10.31.6.63
101	10.31.6.64/28	10.31.6.65 – 10.31.6.78	10.31.6.79
102	10.31.6.80/28	10.31.6.81 – 10.31.6.94	10.31.6.95
103	10.31.6.96/28	10.31.6.97 – 10.31.6.110	10.31.6.111
104	10.31.6.112/28	10.31.6.113 – 10.31.6.126	10.31.6.127
105	10.31.6.128/28	10.31.6.129 – 10.31.6.142	10.31.6.143
106	10.31.6.144/28	10.31.6.145 – 10.31.6.158	10.31.6.159
107	10.31.6.160/28	10.31.6.161 – 10.31.6.174	10.31.6.175
108	10.31.6.176/28	10.31.6.177 – 10.31.6.190	10.31.6.191
109	10.31.6.192/28	10.31.6.193 – 10.31.6.206	10.31.6.207
110	10.31.6.208/28	10.31.6.209 – 10.31.6.222	10.31.6.223
111	10.31.6.224/28	10.31.6.225 – 10.31.6.238	10.31.6.239
112	10.31.6.240/28	10.31.6.241 – 10.31.6.254	10.31.6.255
113	10.31.7.0/28	10.31.7.1 – 10.31.7.14	10.31.7.15
114	10.31.7.16/28	10.31.7.17 – 10.31.7.30	10.31.7.31
115	10.31.7.32/28	10.31.7.33 – 10.31.7.46	10.31.7.47
116	10.31.7.48/28	10.31.7.49 – 10.31.7.62	10.31.7.63
117	10.31.7.64/28	10.31.7.65 – 10.31.7.78	10.31.7.79
118	10.31.7.80/28	10.31.7.81 – 10.31.7.94	10.31.7.95
119	10.31.7.96/28	10.31.7.97 – 10.31.7.110	10.31.7.111
120	10.31.7.112/28	10.31.7.113 – 10.31.7.126	10.31.7.127
121	10.31.7.128/28	10.31.7.129 – 10.31.7.142	10.31.7.143
122	10.31.7.144/28	10.31.7.145 – 10.31.7.158	10.31.7.159
123	10.31.7.160/28	10.31.7.161 – 10.31.7.174	10.31.7.175
124	10.31.7.176/28	10.31.7.177 – 10.31.7.190	10.31.7.191
125	10.31.7.192/28	10.31.7.193 – 10.31.7.206	10.31.7.207
126	10.31.7.208/28	10.31.7.209 – 10.31.7.222	10.31.7.223
127	10.31.7.224/28	10.31.7.225 – 10.31.7.238	10.31.7.239
128	10.31.7.240/28	10.31.7.241 – 10.31.7.254	10.31.7.255
129	10.31.8.0/28	10.31.8.1 – 10.31.8.14	10.31.8.15
130	10.31.8.16/28	10.31.8.17 – 10.31.8.30	10.31.8.31
131	10.31.8.32/28	10.31.8.33 – 10.31.8.46	10.31.8.47
132	10.31.8.48/28	10.31.8.49 – 10.31.8.62	10.31.8.63
133	10.31.8.64/28	10.31.8.65 – 10.31.8.78	10.31.8.79
134	10.31.8.80/28	10.31.8.81 – 10.31.8.94	10.31.8.95
135	10.31.8.96/28	10.31.8.97 – 10.31.8.110	10.31.8.111
136	10.31.8.112/28	10.31.8.113 – 10.31.8.126	10.31.8.127
137	10.31.8.128/28	10.31.8.129 – 10.31.8.142	10.31.8.143
138	10.31.8.144/28	10.31.8.145 – 10.31.8.158	10.31.8.159
139	10.31.8.160/28	10.31.8.161 – 10.31.8.174	10.31.8.175
140	10.31.8.176/28	10.31.8.177 – 10.31.8.190	10.31.8.191
141	10.31.8.192/28	10.31.8.193 – 10.31.8.206	10.31.8.207
142	10.31.8.208/28	10.31.8.209 – 10.31.8.222	10.31.8.223
143	10.31.8.224/28	10.31.8.225 – 10.31.8.238	10.31.8.239
144	10.31.8.240/28	10.31.8.241 – 10.31.8.254	10.31.8.255
145	10.31.9.0/28	10.31.9.1 – 10.31.9.14	10.31.9.15
146	10.31.9.16/28	10.31.9.17 – 10.31.9.30	10.31.9.31
147	10.31.9.32/28	10.31.9.33 – 10.31.9.46	10.31.9.47
148	10.31.9.48/28	10.31.9.49 – 10.31.9.62	10.31.9.63
149	10.31.9.64/28	10.31.9.65 – 10.31.9.78	10.31.9.79
150	10.31.9.80/28	10.31.9.81 – 10.31.9.94	10.31.9.95
151	10.31.9.96/28	10.31.9.97 – 10.31.9.110	10.31.9.111
152	10.31.9.112/28	10.31.9.113 – 10.31.9.126	10.31.9.127
153	10.31.9.128/28	10.31.9.129 – 10.31.9.142	10.31.9.143
154	10.31.9.144/28	10.31.9.145 – 10.31.9.158	10.31.9.159
155	10.31.9.160/28	10.31.9.161 – 10.31.9.174	10.31.9.175
156	10.31.9.176/28	10.31.9.177 – 10.31.9.190	10.31.9.191
157	10.31.9.192/28	10.31.9.193 – 10.31.9.206	10.31.9.207
158	10.31.9.208/28	10.31.9.209 – 10.31.9.222	10.31.9.223
159	10.31.9.224/28	10.31.9.225 – 10.31.9.238	10.31.9.239
160	10.31.9.240/28	10.31.9.241 – 10.31.9.254	10.31.9.255
161	10.31.10.0/28	10.31.10.1 – 10.31.10.14	10.31.10.15
162	10.31.10.16/28	10.31.10.17 – 10.31.10.30	10.31.10.31
163	10.31.10.32/28	10.31.10.33 – 10.31.10.46	10.31.10.47
164	10.31.10.48/28	10.31.10.49 – 10.31.10.62	10.31.10.63
165	10.31.10.64/28	10.31.10.65 – 10.31.10.78	10.31.10.79
166	10.31.10.80/28	10.31.10.81 – 10.31.10.94	10.31.10.95
167	10.31.10.96/28	10.31.10.97 – 10.31.10.110	10.31.10.111
168	10.31.10.112/28	10.31.10.113 – 10.31.10.126	10.31.10.127
169	10.31.10.128/28	10.31.10.129 – 10.31.10.142	10.31.10.143
170	10.31.10.144/28	10.31.10.145 – 10.31.10.158	10.31.10.159
171	10.31.10.160/28	10.31.10.161 – 10.31.10.174	10.31.10.175
172	10.31.10.176/28	10.31.10.177 – 10.31.10.190	10.31.10.191
173	10.31.10.192/28	10.31.10.193 – 10.31.10.206	10.31.10.207
174	10.31.10.208/28	10.31.10.209 – 10.31.10.222	10.31.10.223
175	10.31.10.224/28	10.31.10.225 – 10.31.10.238	10.31.10.239
176	10.31.10.240/28	10.31.10.241 – 10.31.10.254	10.31.10.255
177	10.31.11.0/28	10.31.11.1 – 10.31.11.14	10.31.11.15
178	10.31.11.16/28	10.31.11.17 – 10.31.11.30	10.31.11.31
179	10.31.11.32/28	10.31.11.33 – 10.31.11.46	10.31.11.47
180	10.31.11.48/28	10.31.11.49 – 10.31.11.62	10.31.11.63
181	10.31.11.64/28	10.31.11.65 – 10.31.11.78	10.31.11.79
182	10.31.11.80/28	10.31.11.81 – 10.31.11.94	10.31.11.95
183	10.31.11.96/28	10.31.11.97 – 10.31.11.110	10.31.11.111
184	10.31.11.112/28	10.31.11.113 – 10.31.11.126	10.31.11.127
185	10.31.11.128/28	10.31.11.129 – 10.31.11.142	10.31.11.143
186	10.31.11.144/28	10.31.11.145 – 10.31.11.158	10.31.11.159
187	10.31.11.160/28	10.31.11.161 – 10.31.11.174	10.31.11.175
188	10.31.11.176/28	10.31.11.177 – 10.31.11.190	10.31.11.191
189	10.31.11.192/28	10.31.11.193 – 10.31.11.206	10.31.11.207
190	10.31.11.208/28	10.31.11.209 – 10.31.11.222	10.31.11.223
191	10.31.11.224/28	10.31.11.225 – 10.31.11.238	10.31.11.239
192	10.31.11.240/28	10.31.11.241 – 10.31.11.254	10.31.11.255
193	10.31.12.0/28	10.31.12.1 – 10.31.12.14	10.31.12.15
194	10.31.12.16/28	10.31.12.17 – 10.31.12.30	10.31.12.31
195	10.31.12.32/28	10.31.12.33 – 10.31.12.46	10.31.12.47
196	10.31.12.48/28	10.31.12.49 – 10.31.12.62	10.31.12.63
197	10.31.12.64/28	10.31.12.65 – 10.31.12.78	10.31.12.79
198	10.31.12.80/28	10.31.12.81 – 10.31.12.94	10.31.12.95
199	10.31.12.96/28	10.31.12.97 – 10.31.12.110	10.31.12.111
200	10.31.12.112/28	10.31.12.113 – 10.31.12.126	10.31.12.127
201	10.31.12.128/28	10.31.12.129 – 10.31.12.142	10.31.12.143
202	10.31.12.144/28	10.31.12.145 – 10.31.12.158	10.31.12.159
203	10.31.12.160/28	10.31.12.161 – 10.31.12.174	10.31.12.175
204	10.31.12.176/28	10.31.12.177 – 10.31.12.190	10.31.12.191
205	10.31.12.192/28	10.31.12.193 – 10.31.12.206	10.31.12.207
206	10.31.12.208/28	10.31.12.209 – 10.31.12.222	10.31.12.223
207	10.31.12.224/28	10.31.12.225 – 10.31.12.238	10.31.12.239
208	10.31.12.240/28	10.31.12.241 – 10.31.12.254	10.31.12.255
209	10.31.13.0/28	10.31.13.1 – 10.31.13.14	10.31.13.15
210	10.31.13.16/28	10.31.13.17 – 10.31.13.30	10.31.13.31
211	10.31.13.32/28	10.31.13.33 – 10.31.13.46	10.31.13.47
212	10.31.13.48/28	10.31.13.49 – 10.31.13.62	10.31.13.63
213	10.31.13.64/28	10.31.13.65 – 10.31.13.78	10.31.13.79
214	10.31.13.80/28	10.31.13.81 – 10.31.13.94	10.31.13.95
215	10.31.13.96/28	10.31.13.97 – 10.31.13.110	10.31.13.111
216	10.31.13.112/28	10.31.13.113 – 10.31.13.126	10.31.13.127
217	10.31.13.128/28	10.31.13.129 – 10.31.13.142	10.31.13.143
218	10.31.13.144/28	10.31.13.145 – 10.31.13.158	10.31.13.159
219	10.31.13.160/28	10.31.13.161 – 10.31.13.174	10.31.13.175
220	10.31.13.176/28	10.31.13.177 – 10.31.13.190	10.31.13.191
221	10.31.13.192/28	10.31.13.193 – 10.31.13.206	10.31.13.207
222	10.31.13.208/28	10.31.13.209 – 10.31.13.222	10.31.13.223
223	10.31.13.224/28	10.31.13.225 – 10.31.13.238	10.31.13.239
224	10.31.13.240/28	10.31.13.241 – 10.31.13.254	10.31.13.255
225	10.31.14.0/28	10.31.14.1 – 10.31.14.14	10.31.14.15
226	10.31.14.16/28	10.31.14.17 – 10.31.14.30	10.31.14.31
227	10.31.14.32/28	10.31.14.33 – 10.31.14.46	10.31.14.47
228	10.31.14.48/28	10.31.14.49 – 10.31.14.62	10.31.14.63
229	10.31.14.64/28	10.31.14.65 – 10.31.14.78	10.31.14.79
230	10.31.14.80/28	10.31.14.81 – 10.31.14.94	10.31.14.95
231	10.31.14.96/28	10.31.14.97 – 10.31.14.110	10.31.14.111
232	10.31.14.112/28	10.31.14.113 – 10.31.14.126	10.31.14.127
233	10.31.14.128/28	10.31.14.129 – 10.31.14.142	10.31.14.143
234	10.31.14.144/28	10.31.14.145 – 10.31.14.158	10.31.14.159
235	10.31.14.160/28	10.31.14.161 – 10.31.14.174	10.31.14.175
236	10.31.14.176/28	10.31.14.177 – 10.31.14.190	10.31.14.191
237	10.31.14.192/28	10.31.14.193 – 10.31.14.206	10.31.14.207
238	10.31.14.208/28	10.31.14.209 – 10.31.14.222	10.31.14.223
239	10.31.14.224/28	10.31.14.225 – 10.31.14.238	10.31.14.239
240	10.31.14.240/28	10.31.14.241 – 10.31.14.254	10.31.14.255
241	10.31.15.0/28	10.31.15.1 – 10.31.15.14	10.31.15.15
242	10.31.15.16/28	10.31.15.17 – 10.31.15.30	10.31.15.31
243	10.31.15.32/28	10.31.15.33 – 10.31.15.46	10.31.15.47
244	10.31.15.48/28	10.31.15.49 – 10.31.15.62	10.31.15.63
245	10.31.15.64/28	10.31.15.65 – 10.31.15.78	10.31.15.79
246	10.31.15.80/28	10.31.15.81 – 10.31.15.94	10.31.15.95
247	10.31.15.96/28	10.31.15.97 – 10.31.15.110	10.31.15.111
248	10.31.15.112/28	10.31.15.113 – 10.31.15.126	10.31.15.127
249	10.31.15.128/28	10.31.15.129 – 10.31.15.142	10.31.15.143
250	10.31.15.144/28	10.31.15.145 – 10.31.15.158	10.31.15.159
251	10.31.15.160/28	10.31.15.161 – 10.31.15.174	10.31.15.175
252	10.31.15.176/28	10.31.15.177 – 10.31.15.190	10.31.15.191
253	10.31.15.192/28	10.31.15.193 – 10.31.15.206	10.31.15.207
254	10.31.15.208/28	10.31.15.209 – 10.31.15.222	10.31.15.223
255	10.31.15.224/28	10.31.15.225 – 10.31.15.238	10.31.15.239
256	10.31.15.240/28	10.31.15.241 – 10.31.15.254	10.31.15.255

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 /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 →