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)10.18.96.0/19

network10.18.96.0/19

broadcast10.18.127.255

first host10.18.96.1

last host10.18.127.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.18.96.0/19

address00001010.00010010.01100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010010.01100000.00000000

broadcast00001010.00010010.01111111.11111111

green = network part, grey = host part

hex0x0a126000

decimal168976384

reverse dns0.96.18.10.in-addr.arpa

ipv4-mapped::ffff:a12:6000

/19 split into /27 · 256 subnets

close ×

#	network	host range	broadcast
1	10.18.96.0/27	10.18.96.1 – 10.18.96.30	10.18.96.31
2	10.18.96.32/27	10.18.96.33 – 10.18.96.62	10.18.96.63
3	10.18.96.64/27	10.18.96.65 – 10.18.96.94	10.18.96.95
4	10.18.96.96/27	10.18.96.97 – 10.18.96.126	10.18.96.127
5	10.18.96.128/27	10.18.96.129 – 10.18.96.158	10.18.96.159
6	10.18.96.160/27	10.18.96.161 – 10.18.96.190	10.18.96.191
7	10.18.96.192/27	10.18.96.193 – 10.18.96.222	10.18.96.223
8	10.18.96.224/27	10.18.96.225 – 10.18.96.254	10.18.96.255
9	10.18.97.0/27	10.18.97.1 – 10.18.97.30	10.18.97.31
10	10.18.97.32/27	10.18.97.33 – 10.18.97.62	10.18.97.63
11	10.18.97.64/27	10.18.97.65 – 10.18.97.94	10.18.97.95
12	10.18.97.96/27	10.18.97.97 – 10.18.97.126	10.18.97.127
13	10.18.97.128/27	10.18.97.129 – 10.18.97.158	10.18.97.159
14	10.18.97.160/27	10.18.97.161 – 10.18.97.190	10.18.97.191
15	10.18.97.192/27	10.18.97.193 – 10.18.97.222	10.18.97.223
16	10.18.97.224/27	10.18.97.225 – 10.18.97.254	10.18.97.255
17	10.18.98.0/27	10.18.98.1 – 10.18.98.30	10.18.98.31
18	10.18.98.32/27	10.18.98.33 – 10.18.98.62	10.18.98.63
19	10.18.98.64/27	10.18.98.65 – 10.18.98.94	10.18.98.95
20	10.18.98.96/27	10.18.98.97 – 10.18.98.126	10.18.98.127
21	10.18.98.128/27	10.18.98.129 – 10.18.98.158	10.18.98.159
22	10.18.98.160/27	10.18.98.161 – 10.18.98.190	10.18.98.191
23	10.18.98.192/27	10.18.98.193 – 10.18.98.222	10.18.98.223
24	10.18.98.224/27	10.18.98.225 – 10.18.98.254	10.18.98.255
25	10.18.99.0/27	10.18.99.1 – 10.18.99.30	10.18.99.31
26	10.18.99.32/27	10.18.99.33 – 10.18.99.62	10.18.99.63
27	10.18.99.64/27	10.18.99.65 – 10.18.99.94	10.18.99.95
28	10.18.99.96/27	10.18.99.97 – 10.18.99.126	10.18.99.127
29	10.18.99.128/27	10.18.99.129 – 10.18.99.158	10.18.99.159
30	10.18.99.160/27	10.18.99.161 – 10.18.99.190	10.18.99.191
31	10.18.99.192/27	10.18.99.193 – 10.18.99.222	10.18.99.223
32	10.18.99.224/27	10.18.99.225 – 10.18.99.254	10.18.99.255
33	10.18.100.0/27	10.18.100.1 – 10.18.100.30	10.18.100.31
34	10.18.100.32/27	10.18.100.33 – 10.18.100.62	10.18.100.63
35	10.18.100.64/27	10.18.100.65 – 10.18.100.94	10.18.100.95
36	10.18.100.96/27	10.18.100.97 – 10.18.100.126	10.18.100.127
37	10.18.100.128/27	10.18.100.129 – 10.18.100.158	10.18.100.159
38	10.18.100.160/27	10.18.100.161 – 10.18.100.190	10.18.100.191
39	10.18.100.192/27	10.18.100.193 – 10.18.100.222	10.18.100.223
40	10.18.100.224/27	10.18.100.225 – 10.18.100.254	10.18.100.255
41	10.18.101.0/27	10.18.101.1 – 10.18.101.30	10.18.101.31
42	10.18.101.32/27	10.18.101.33 – 10.18.101.62	10.18.101.63
43	10.18.101.64/27	10.18.101.65 – 10.18.101.94	10.18.101.95
44	10.18.101.96/27	10.18.101.97 – 10.18.101.126	10.18.101.127
45	10.18.101.128/27	10.18.101.129 – 10.18.101.158	10.18.101.159
46	10.18.101.160/27	10.18.101.161 – 10.18.101.190	10.18.101.191
47	10.18.101.192/27	10.18.101.193 – 10.18.101.222	10.18.101.223
48	10.18.101.224/27	10.18.101.225 – 10.18.101.254	10.18.101.255
49	10.18.102.0/27	10.18.102.1 – 10.18.102.30	10.18.102.31
50	10.18.102.32/27	10.18.102.33 – 10.18.102.62	10.18.102.63
51	10.18.102.64/27	10.18.102.65 – 10.18.102.94	10.18.102.95
52	10.18.102.96/27	10.18.102.97 – 10.18.102.126	10.18.102.127
53	10.18.102.128/27	10.18.102.129 – 10.18.102.158	10.18.102.159
54	10.18.102.160/27	10.18.102.161 – 10.18.102.190	10.18.102.191
55	10.18.102.192/27	10.18.102.193 – 10.18.102.222	10.18.102.223
56	10.18.102.224/27	10.18.102.225 – 10.18.102.254	10.18.102.255
57	10.18.103.0/27	10.18.103.1 – 10.18.103.30	10.18.103.31
58	10.18.103.32/27	10.18.103.33 – 10.18.103.62	10.18.103.63
59	10.18.103.64/27	10.18.103.65 – 10.18.103.94	10.18.103.95
60	10.18.103.96/27	10.18.103.97 – 10.18.103.126	10.18.103.127
61	10.18.103.128/27	10.18.103.129 – 10.18.103.158	10.18.103.159
62	10.18.103.160/27	10.18.103.161 – 10.18.103.190	10.18.103.191
63	10.18.103.192/27	10.18.103.193 – 10.18.103.222	10.18.103.223
64	10.18.103.224/27	10.18.103.225 – 10.18.103.254	10.18.103.255
65	10.18.104.0/27	10.18.104.1 – 10.18.104.30	10.18.104.31
66	10.18.104.32/27	10.18.104.33 – 10.18.104.62	10.18.104.63
67	10.18.104.64/27	10.18.104.65 – 10.18.104.94	10.18.104.95
68	10.18.104.96/27	10.18.104.97 – 10.18.104.126	10.18.104.127
69	10.18.104.128/27	10.18.104.129 – 10.18.104.158	10.18.104.159
70	10.18.104.160/27	10.18.104.161 – 10.18.104.190	10.18.104.191
71	10.18.104.192/27	10.18.104.193 – 10.18.104.222	10.18.104.223
72	10.18.104.224/27	10.18.104.225 – 10.18.104.254	10.18.104.255
73	10.18.105.0/27	10.18.105.1 – 10.18.105.30	10.18.105.31
74	10.18.105.32/27	10.18.105.33 – 10.18.105.62	10.18.105.63
75	10.18.105.64/27	10.18.105.65 – 10.18.105.94	10.18.105.95
76	10.18.105.96/27	10.18.105.97 – 10.18.105.126	10.18.105.127
77	10.18.105.128/27	10.18.105.129 – 10.18.105.158	10.18.105.159
78	10.18.105.160/27	10.18.105.161 – 10.18.105.190	10.18.105.191
79	10.18.105.192/27	10.18.105.193 – 10.18.105.222	10.18.105.223
80	10.18.105.224/27	10.18.105.225 – 10.18.105.254	10.18.105.255
81	10.18.106.0/27	10.18.106.1 – 10.18.106.30	10.18.106.31
82	10.18.106.32/27	10.18.106.33 – 10.18.106.62	10.18.106.63
83	10.18.106.64/27	10.18.106.65 – 10.18.106.94	10.18.106.95
84	10.18.106.96/27	10.18.106.97 – 10.18.106.126	10.18.106.127
85	10.18.106.128/27	10.18.106.129 – 10.18.106.158	10.18.106.159
86	10.18.106.160/27	10.18.106.161 – 10.18.106.190	10.18.106.191
87	10.18.106.192/27	10.18.106.193 – 10.18.106.222	10.18.106.223
88	10.18.106.224/27	10.18.106.225 – 10.18.106.254	10.18.106.255
89	10.18.107.0/27	10.18.107.1 – 10.18.107.30	10.18.107.31
90	10.18.107.32/27	10.18.107.33 – 10.18.107.62	10.18.107.63
91	10.18.107.64/27	10.18.107.65 – 10.18.107.94	10.18.107.95
92	10.18.107.96/27	10.18.107.97 – 10.18.107.126	10.18.107.127
93	10.18.107.128/27	10.18.107.129 – 10.18.107.158	10.18.107.159
94	10.18.107.160/27	10.18.107.161 – 10.18.107.190	10.18.107.191
95	10.18.107.192/27	10.18.107.193 – 10.18.107.222	10.18.107.223
96	10.18.107.224/27	10.18.107.225 – 10.18.107.254	10.18.107.255
97	10.18.108.0/27	10.18.108.1 – 10.18.108.30	10.18.108.31
98	10.18.108.32/27	10.18.108.33 – 10.18.108.62	10.18.108.63
99	10.18.108.64/27	10.18.108.65 – 10.18.108.94	10.18.108.95
100	10.18.108.96/27	10.18.108.97 – 10.18.108.126	10.18.108.127
101	10.18.108.128/27	10.18.108.129 – 10.18.108.158	10.18.108.159
102	10.18.108.160/27	10.18.108.161 – 10.18.108.190	10.18.108.191
103	10.18.108.192/27	10.18.108.193 – 10.18.108.222	10.18.108.223
104	10.18.108.224/27	10.18.108.225 – 10.18.108.254	10.18.108.255
105	10.18.109.0/27	10.18.109.1 – 10.18.109.30	10.18.109.31
106	10.18.109.32/27	10.18.109.33 – 10.18.109.62	10.18.109.63
107	10.18.109.64/27	10.18.109.65 – 10.18.109.94	10.18.109.95
108	10.18.109.96/27	10.18.109.97 – 10.18.109.126	10.18.109.127
109	10.18.109.128/27	10.18.109.129 – 10.18.109.158	10.18.109.159
110	10.18.109.160/27	10.18.109.161 – 10.18.109.190	10.18.109.191
111	10.18.109.192/27	10.18.109.193 – 10.18.109.222	10.18.109.223
112	10.18.109.224/27	10.18.109.225 – 10.18.109.254	10.18.109.255
113	10.18.110.0/27	10.18.110.1 – 10.18.110.30	10.18.110.31
114	10.18.110.32/27	10.18.110.33 – 10.18.110.62	10.18.110.63
115	10.18.110.64/27	10.18.110.65 – 10.18.110.94	10.18.110.95
116	10.18.110.96/27	10.18.110.97 – 10.18.110.126	10.18.110.127
117	10.18.110.128/27	10.18.110.129 – 10.18.110.158	10.18.110.159
118	10.18.110.160/27	10.18.110.161 – 10.18.110.190	10.18.110.191
119	10.18.110.192/27	10.18.110.193 – 10.18.110.222	10.18.110.223
120	10.18.110.224/27	10.18.110.225 – 10.18.110.254	10.18.110.255
121	10.18.111.0/27	10.18.111.1 – 10.18.111.30	10.18.111.31
122	10.18.111.32/27	10.18.111.33 – 10.18.111.62	10.18.111.63
123	10.18.111.64/27	10.18.111.65 – 10.18.111.94	10.18.111.95
124	10.18.111.96/27	10.18.111.97 – 10.18.111.126	10.18.111.127
125	10.18.111.128/27	10.18.111.129 – 10.18.111.158	10.18.111.159
126	10.18.111.160/27	10.18.111.161 – 10.18.111.190	10.18.111.191
127	10.18.111.192/27	10.18.111.193 – 10.18.111.222	10.18.111.223
128	10.18.111.224/27	10.18.111.225 – 10.18.111.254	10.18.111.255
129	10.18.112.0/27	10.18.112.1 – 10.18.112.30	10.18.112.31
130	10.18.112.32/27	10.18.112.33 – 10.18.112.62	10.18.112.63
131	10.18.112.64/27	10.18.112.65 – 10.18.112.94	10.18.112.95
132	10.18.112.96/27	10.18.112.97 – 10.18.112.126	10.18.112.127
133	10.18.112.128/27	10.18.112.129 – 10.18.112.158	10.18.112.159
134	10.18.112.160/27	10.18.112.161 – 10.18.112.190	10.18.112.191
135	10.18.112.192/27	10.18.112.193 – 10.18.112.222	10.18.112.223
136	10.18.112.224/27	10.18.112.225 – 10.18.112.254	10.18.112.255
137	10.18.113.0/27	10.18.113.1 – 10.18.113.30	10.18.113.31
138	10.18.113.32/27	10.18.113.33 – 10.18.113.62	10.18.113.63
139	10.18.113.64/27	10.18.113.65 – 10.18.113.94	10.18.113.95
140	10.18.113.96/27	10.18.113.97 – 10.18.113.126	10.18.113.127
141	10.18.113.128/27	10.18.113.129 – 10.18.113.158	10.18.113.159
142	10.18.113.160/27	10.18.113.161 – 10.18.113.190	10.18.113.191
143	10.18.113.192/27	10.18.113.193 – 10.18.113.222	10.18.113.223
144	10.18.113.224/27	10.18.113.225 – 10.18.113.254	10.18.113.255
145	10.18.114.0/27	10.18.114.1 – 10.18.114.30	10.18.114.31
146	10.18.114.32/27	10.18.114.33 – 10.18.114.62	10.18.114.63
147	10.18.114.64/27	10.18.114.65 – 10.18.114.94	10.18.114.95
148	10.18.114.96/27	10.18.114.97 – 10.18.114.126	10.18.114.127
149	10.18.114.128/27	10.18.114.129 – 10.18.114.158	10.18.114.159
150	10.18.114.160/27	10.18.114.161 – 10.18.114.190	10.18.114.191
151	10.18.114.192/27	10.18.114.193 – 10.18.114.222	10.18.114.223
152	10.18.114.224/27	10.18.114.225 – 10.18.114.254	10.18.114.255
153	10.18.115.0/27	10.18.115.1 – 10.18.115.30	10.18.115.31
154	10.18.115.32/27	10.18.115.33 – 10.18.115.62	10.18.115.63
155	10.18.115.64/27	10.18.115.65 – 10.18.115.94	10.18.115.95
156	10.18.115.96/27	10.18.115.97 – 10.18.115.126	10.18.115.127
157	10.18.115.128/27	10.18.115.129 – 10.18.115.158	10.18.115.159
158	10.18.115.160/27	10.18.115.161 – 10.18.115.190	10.18.115.191
159	10.18.115.192/27	10.18.115.193 – 10.18.115.222	10.18.115.223
160	10.18.115.224/27	10.18.115.225 – 10.18.115.254	10.18.115.255
161	10.18.116.0/27	10.18.116.1 – 10.18.116.30	10.18.116.31
162	10.18.116.32/27	10.18.116.33 – 10.18.116.62	10.18.116.63
163	10.18.116.64/27	10.18.116.65 – 10.18.116.94	10.18.116.95
164	10.18.116.96/27	10.18.116.97 – 10.18.116.126	10.18.116.127
165	10.18.116.128/27	10.18.116.129 – 10.18.116.158	10.18.116.159
166	10.18.116.160/27	10.18.116.161 – 10.18.116.190	10.18.116.191
167	10.18.116.192/27	10.18.116.193 – 10.18.116.222	10.18.116.223
168	10.18.116.224/27	10.18.116.225 – 10.18.116.254	10.18.116.255
169	10.18.117.0/27	10.18.117.1 – 10.18.117.30	10.18.117.31
170	10.18.117.32/27	10.18.117.33 – 10.18.117.62	10.18.117.63
171	10.18.117.64/27	10.18.117.65 – 10.18.117.94	10.18.117.95
172	10.18.117.96/27	10.18.117.97 – 10.18.117.126	10.18.117.127
173	10.18.117.128/27	10.18.117.129 – 10.18.117.158	10.18.117.159
174	10.18.117.160/27	10.18.117.161 – 10.18.117.190	10.18.117.191
175	10.18.117.192/27	10.18.117.193 – 10.18.117.222	10.18.117.223
176	10.18.117.224/27	10.18.117.225 – 10.18.117.254	10.18.117.255
177	10.18.118.0/27	10.18.118.1 – 10.18.118.30	10.18.118.31
178	10.18.118.32/27	10.18.118.33 – 10.18.118.62	10.18.118.63
179	10.18.118.64/27	10.18.118.65 – 10.18.118.94	10.18.118.95
180	10.18.118.96/27	10.18.118.97 – 10.18.118.126	10.18.118.127
181	10.18.118.128/27	10.18.118.129 – 10.18.118.158	10.18.118.159
182	10.18.118.160/27	10.18.118.161 – 10.18.118.190	10.18.118.191
183	10.18.118.192/27	10.18.118.193 – 10.18.118.222	10.18.118.223
184	10.18.118.224/27	10.18.118.225 – 10.18.118.254	10.18.118.255
185	10.18.119.0/27	10.18.119.1 – 10.18.119.30	10.18.119.31
186	10.18.119.32/27	10.18.119.33 – 10.18.119.62	10.18.119.63
187	10.18.119.64/27	10.18.119.65 – 10.18.119.94	10.18.119.95
188	10.18.119.96/27	10.18.119.97 – 10.18.119.126	10.18.119.127
189	10.18.119.128/27	10.18.119.129 – 10.18.119.158	10.18.119.159
190	10.18.119.160/27	10.18.119.161 – 10.18.119.190	10.18.119.191
191	10.18.119.192/27	10.18.119.193 – 10.18.119.222	10.18.119.223
192	10.18.119.224/27	10.18.119.225 – 10.18.119.254	10.18.119.255
193	10.18.120.0/27	10.18.120.1 – 10.18.120.30	10.18.120.31
194	10.18.120.32/27	10.18.120.33 – 10.18.120.62	10.18.120.63
195	10.18.120.64/27	10.18.120.65 – 10.18.120.94	10.18.120.95
196	10.18.120.96/27	10.18.120.97 – 10.18.120.126	10.18.120.127
197	10.18.120.128/27	10.18.120.129 – 10.18.120.158	10.18.120.159
198	10.18.120.160/27	10.18.120.161 – 10.18.120.190	10.18.120.191
199	10.18.120.192/27	10.18.120.193 – 10.18.120.222	10.18.120.223
200	10.18.120.224/27	10.18.120.225 – 10.18.120.254	10.18.120.255
201	10.18.121.0/27	10.18.121.1 – 10.18.121.30	10.18.121.31
202	10.18.121.32/27	10.18.121.33 – 10.18.121.62	10.18.121.63
203	10.18.121.64/27	10.18.121.65 – 10.18.121.94	10.18.121.95
204	10.18.121.96/27	10.18.121.97 – 10.18.121.126	10.18.121.127
205	10.18.121.128/27	10.18.121.129 – 10.18.121.158	10.18.121.159
206	10.18.121.160/27	10.18.121.161 – 10.18.121.190	10.18.121.191
207	10.18.121.192/27	10.18.121.193 – 10.18.121.222	10.18.121.223
208	10.18.121.224/27	10.18.121.225 – 10.18.121.254	10.18.121.255
209	10.18.122.0/27	10.18.122.1 – 10.18.122.30	10.18.122.31
210	10.18.122.32/27	10.18.122.33 – 10.18.122.62	10.18.122.63
211	10.18.122.64/27	10.18.122.65 – 10.18.122.94	10.18.122.95
212	10.18.122.96/27	10.18.122.97 – 10.18.122.126	10.18.122.127
213	10.18.122.128/27	10.18.122.129 – 10.18.122.158	10.18.122.159
214	10.18.122.160/27	10.18.122.161 – 10.18.122.190	10.18.122.191
215	10.18.122.192/27	10.18.122.193 – 10.18.122.222	10.18.122.223
216	10.18.122.224/27	10.18.122.225 – 10.18.122.254	10.18.122.255
217	10.18.123.0/27	10.18.123.1 – 10.18.123.30	10.18.123.31
218	10.18.123.32/27	10.18.123.33 – 10.18.123.62	10.18.123.63
219	10.18.123.64/27	10.18.123.65 – 10.18.123.94	10.18.123.95
220	10.18.123.96/27	10.18.123.97 – 10.18.123.126	10.18.123.127
221	10.18.123.128/27	10.18.123.129 – 10.18.123.158	10.18.123.159
222	10.18.123.160/27	10.18.123.161 – 10.18.123.190	10.18.123.191
223	10.18.123.192/27	10.18.123.193 – 10.18.123.222	10.18.123.223
224	10.18.123.224/27	10.18.123.225 – 10.18.123.254	10.18.123.255
225	10.18.124.0/27	10.18.124.1 – 10.18.124.30	10.18.124.31
226	10.18.124.32/27	10.18.124.33 – 10.18.124.62	10.18.124.63
227	10.18.124.64/27	10.18.124.65 – 10.18.124.94	10.18.124.95
228	10.18.124.96/27	10.18.124.97 – 10.18.124.126	10.18.124.127
229	10.18.124.128/27	10.18.124.129 – 10.18.124.158	10.18.124.159
230	10.18.124.160/27	10.18.124.161 – 10.18.124.190	10.18.124.191
231	10.18.124.192/27	10.18.124.193 – 10.18.124.222	10.18.124.223
232	10.18.124.224/27	10.18.124.225 – 10.18.124.254	10.18.124.255
233	10.18.125.0/27	10.18.125.1 – 10.18.125.30	10.18.125.31
234	10.18.125.32/27	10.18.125.33 – 10.18.125.62	10.18.125.63
235	10.18.125.64/27	10.18.125.65 – 10.18.125.94	10.18.125.95
236	10.18.125.96/27	10.18.125.97 – 10.18.125.126	10.18.125.127
237	10.18.125.128/27	10.18.125.129 – 10.18.125.158	10.18.125.159
238	10.18.125.160/27	10.18.125.161 – 10.18.125.190	10.18.125.191
239	10.18.125.192/27	10.18.125.193 – 10.18.125.222	10.18.125.223
240	10.18.125.224/27	10.18.125.225 – 10.18.125.254	10.18.125.255
241	10.18.126.0/27	10.18.126.1 – 10.18.126.30	10.18.126.31
242	10.18.126.32/27	10.18.126.33 – 10.18.126.62	10.18.126.63
243	10.18.126.64/27	10.18.126.65 – 10.18.126.94	10.18.126.95
244	10.18.126.96/27	10.18.126.97 – 10.18.126.126	10.18.126.127
245	10.18.126.128/27	10.18.126.129 – 10.18.126.158	10.18.126.159
246	10.18.126.160/27	10.18.126.161 – 10.18.126.190	10.18.126.191
247	10.18.126.192/27	10.18.126.193 – 10.18.126.222	10.18.126.223
248	10.18.126.224/27	10.18.126.225 – 10.18.126.254	10.18.126.255
249	10.18.127.0/27	10.18.127.1 – 10.18.127.30	10.18.127.31
250	10.18.127.32/27	10.18.127.33 – 10.18.127.62	10.18.127.63
251	10.18.127.64/27	10.18.127.65 – 10.18.127.94	10.18.127.95
252	10.18.127.96/27	10.18.127.97 – 10.18.127.126	10.18.127.127
253	10.18.127.128/27	10.18.127.129 – 10.18.127.158	10.18.127.159
254	10.18.127.160/27	10.18.127.161 – 10.18.127.190	10.18.127.191
255	10.18.127.192/27	10.18.127.193 – 10.18.127.222	10.18.127.223
256	10.18.127.224/27	10.18.127.225 – 10.18.127.254	10.18.127.255

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 /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 →