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)10.56.0.0/13

network10.56.0.0/13

broadcast10.63.255.255

first host10.56.0.1

last host10.63.255.254

subnet mask255.248.0.0

wildcard0.7.255.255

addresses524,288

usable hosts524,286

classA

ipcalc 10.56.0.0/13

address00001010.00111000.00000000.00000000

subnet mask11111111.11111000.00000000.00000000

network00001010.00111000.00000000.00000000

broadcast00001010.00111111.11111111.11111111

green = network part, grey = host part

hex0x0a380000

decimal171442176

reverse dns0.0.56.10.in-addr.arpa

ipv4-mapped::ffff:a38:0

/13 split into /21 · 256 subnets

close ×

#	network	host range	broadcast
1	10.56.0.0/21	10.56.0.1 – 10.56.7.254	10.56.7.255
2	10.56.8.0/21	10.56.8.1 – 10.56.15.254	10.56.15.255
3	10.56.16.0/21	10.56.16.1 – 10.56.23.254	10.56.23.255
4	10.56.24.0/21	10.56.24.1 – 10.56.31.254	10.56.31.255
5	10.56.32.0/21	10.56.32.1 – 10.56.39.254	10.56.39.255
6	10.56.40.0/21	10.56.40.1 – 10.56.47.254	10.56.47.255
7	10.56.48.0/21	10.56.48.1 – 10.56.55.254	10.56.55.255
8	10.56.56.0/21	10.56.56.1 – 10.56.63.254	10.56.63.255
9	10.56.64.0/21	10.56.64.1 – 10.56.71.254	10.56.71.255
10	10.56.72.0/21	10.56.72.1 – 10.56.79.254	10.56.79.255
11	10.56.80.0/21	10.56.80.1 – 10.56.87.254	10.56.87.255
12	10.56.88.0/21	10.56.88.1 – 10.56.95.254	10.56.95.255
13	10.56.96.0/21	10.56.96.1 – 10.56.103.254	10.56.103.255
14	10.56.104.0/21	10.56.104.1 – 10.56.111.254	10.56.111.255
15	10.56.112.0/21	10.56.112.1 – 10.56.119.254	10.56.119.255
16	10.56.120.0/21	10.56.120.1 – 10.56.127.254	10.56.127.255
17	10.56.128.0/21	10.56.128.1 – 10.56.135.254	10.56.135.255
18	10.56.136.0/21	10.56.136.1 – 10.56.143.254	10.56.143.255
19	10.56.144.0/21	10.56.144.1 – 10.56.151.254	10.56.151.255
20	10.56.152.0/21	10.56.152.1 – 10.56.159.254	10.56.159.255
21	10.56.160.0/21	10.56.160.1 – 10.56.167.254	10.56.167.255
22	10.56.168.0/21	10.56.168.1 – 10.56.175.254	10.56.175.255
23	10.56.176.0/21	10.56.176.1 – 10.56.183.254	10.56.183.255
24	10.56.184.0/21	10.56.184.1 – 10.56.191.254	10.56.191.255
25	10.56.192.0/21	10.56.192.1 – 10.56.199.254	10.56.199.255
26	10.56.200.0/21	10.56.200.1 – 10.56.207.254	10.56.207.255
27	10.56.208.0/21	10.56.208.1 – 10.56.215.254	10.56.215.255
28	10.56.216.0/21	10.56.216.1 – 10.56.223.254	10.56.223.255
29	10.56.224.0/21	10.56.224.1 – 10.56.231.254	10.56.231.255
30	10.56.232.0/21	10.56.232.1 – 10.56.239.254	10.56.239.255
31	10.56.240.0/21	10.56.240.1 – 10.56.247.254	10.56.247.255
32	10.56.248.0/21	10.56.248.1 – 10.56.255.254	10.56.255.255
33	10.57.0.0/21	10.57.0.1 – 10.57.7.254	10.57.7.255
34	10.57.8.0/21	10.57.8.1 – 10.57.15.254	10.57.15.255
35	10.57.16.0/21	10.57.16.1 – 10.57.23.254	10.57.23.255
36	10.57.24.0/21	10.57.24.1 – 10.57.31.254	10.57.31.255
37	10.57.32.0/21	10.57.32.1 – 10.57.39.254	10.57.39.255
38	10.57.40.0/21	10.57.40.1 – 10.57.47.254	10.57.47.255
39	10.57.48.0/21	10.57.48.1 – 10.57.55.254	10.57.55.255
40	10.57.56.0/21	10.57.56.1 – 10.57.63.254	10.57.63.255
41	10.57.64.0/21	10.57.64.1 – 10.57.71.254	10.57.71.255
42	10.57.72.0/21	10.57.72.1 – 10.57.79.254	10.57.79.255
43	10.57.80.0/21	10.57.80.1 – 10.57.87.254	10.57.87.255
44	10.57.88.0/21	10.57.88.1 – 10.57.95.254	10.57.95.255
45	10.57.96.0/21	10.57.96.1 – 10.57.103.254	10.57.103.255
46	10.57.104.0/21	10.57.104.1 – 10.57.111.254	10.57.111.255
47	10.57.112.0/21	10.57.112.1 – 10.57.119.254	10.57.119.255
48	10.57.120.0/21	10.57.120.1 – 10.57.127.254	10.57.127.255
49	10.57.128.0/21	10.57.128.1 – 10.57.135.254	10.57.135.255
50	10.57.136.0/21	10.57.136.1 – 10.57.143.254	10.57.143.255
51	10.57.144.0/21	10.57.144.1 – 10.57.151.254	10.57.151.255
52	10.57.152.0/21	10.57.152.1 – 10.57.159.254	10.57.159.255
53	10.57.160.0/21	10.57.160.1 – 10.57.167.254	10.57.167.255
54	10.57.168.0/21	10.57.168.1 – 10.57.175.254	10.57.175.255
55	10.57.176.0/21	10.57.176.1 – 10.57.183.254	10.57.183.255
56	10.57.184.0/21	10.57.184.1 – 10.57.191.254	10.57.191.255
57	10.57.192.0/21	10.57.192.1 – 10.57.199.254	10.57.199.255
58	10.57.200.0/21	10.57.200.1 – 10.57.207.254	10.57.207.255
59	10.57.208.0/21	10.57.208.1 – 10.57.215.254	10.57.215.255
60	10.57.216.0/21	10.57.216.1 – 10.57.223.254	10.57.223.255
61	10.57.224.0/21	10.57.224.1 – 10.57.231.254	10.57.231.255
62	10.57.232.0/21	10.57.232.1 – 10.57.239.254	10.57.239.255
63	10.57.240.0/21	10.57.240.1 – 10.57.247.254	10.57.247.255
64	10.57.248.0/21	10.57.248.1 – 10.57.255.254	10.57.255.255
65	10.58.0.0/21	10.58.0.1 – 10.58.7.254	10.58.7.255
66	10.58.8.0/21	10.58.8.1 – 10.58.15.254	10.58.15.255
67	10.58.16.0/21	10.58.16.1 – 10.58.23.254	10.58.23.255
68	10.58.24.0/21	10.58.24.1 – 10.58.31.254	10.58.31.255
69	10.58.32.0/21	10.58.32.1 – 10.58.39.254	10.58.39.255
70	10.58.40.0/21	10.58.40.1 – 10.58.47.254	10.58.47.255
71	10.58.48.0/21	10.58.48.1 – 10.58.55.254	10.58.55.255
72	10.58.56.0/21	10.58.56.1 – 10.58.63.254	10.58.63.255
73	10.58.64.0/21	10.58.64.1 – 10.58.71.254	10.58.71.255
74	10.58.72.0/21	10.58.72.1 – 10.58.79.254	10.58.79.255
75	10.58.80.0/21	10.58.80.1 – 10.58.87.254	10.58.87.255
76	10.58.88.0/21	10.58.88.1 – 10.58.95.254	10.58.95.255
77	10.58.96.0/21	10.58.96.1 – 10.58.103.254	10.58.103.255
78	10.58.104.0/21	10.58.104.1 – 10.58.111.254	10.58.111.255
79	10.58.112.0/21	10.58.112.1 – 10.58.119.254	10.58.119.255
80	10.58.120.0/21	10.58.120.1 – 10.58.127.254	10.58.127.255
81	10.58.128.0/21	10.58.128.1 – 10.58.135.254	10.58.135.255
82	10.58.136.0/21	10.58.136.1 – 10.58.143.254	10.58.143.255
83	10.58.144.0/21	10.58.144.1 – 10.58.151.254	10.58.151.255
84	10.58.152.0/21	10.58.152.1 – 10.58.159.254	10.58.159.255
85	10.58.160.0/21	10.58.160.1 – 10.58.167.254	10.58.167.255
86	10.58.168.0/21	10.58.168.1 – 10.58.175.254	10.58.175.255
87	10.58.176.0/21	10.58.176.1 – 10.58.183.254	10.58.183.255
88	10.58.184.0/21	10.58.184.1 – 10.58.191.254	10.58.191.255
89	10.58.192.0/21	10.58.192.1 – 10.58.199.254	10.58.199.255
90	10.58.200.0/21	10.58.200.1 – 10.58.207.254	10.58.207.255
91	10.58.208.0/21	10.58.208.1 – 10.58.215.254	10.58.215.255
92	10.58.216.0/21	10.58.216.1 – 10.58.223.254	10.58.223.255
93	10.58.224.0/21	10.58.224.1 – 10.58.231.254	10.58.231.255
94	10.58.232.0/21	10.58.232.1 – 10.58.239.254	10.58.239.255
95	10.58.240.0/21	10.58.240.1 – 10.58.247.254	10.58.247.255
96	10.58.248.0/21	10.58.248.1 – 10.58.255.254	10.58.255.255
97	10.59.0.0/21	10.59.0.1 – 10.59.7.254	10.59.7.255
98	10.59.8.0/21	10.59.8.1 – 10.59.15.254	10.59.15.255
99	10.59.16.0/21	10.59.16.1 – 10.59.23.254	10.59.23.255
100	10.59.24.0/21	10.59.24.1 – 10.59.31.254	10.59.31.255
101	10.59.32.0/21	10.59.32.1 – 10.59.39.254	10.59.39.255
102	10.59.40.0/21	10.59.40.1 – 10.59.47.254	10.59.47.255
103	10.59.48.0/21	10.59.48.1 – 10.59.55.254	10.59.55.255
104	10.59.56.0/21	10.59.56.1 – 10.59.63.254	10.59.63.255
105	10.59.64.0/21	10.59.64.1 – 10.59.71.254	10.59.71.255
106	10.59.72.0/21	10.59.72.1 – 10.59.79.254	10.59.79.255
107	10.59.80.0/21	10.59.80.1 – 10.59.87.254	10.59.87.255
108	10.59.88.0/21	10.59.88.1 – 10.59.95.254	10.59.95.255
109	10.59.96.0/21	10.59.96.1 – 10.59.103.254	10.59.103.255
110	10.59.104.0/21	10.59.104.1 – 10.59.111.254	10.59.111.255
111	10.59.112.0/21	10.59.112.1 – 10.59.119.254	10.59.119.255
112	10.59.120.0/21	10.59.120.1 – 10.59.127.254	10.59.127.255
113	10.59.128.0/21	10.59.128.1 – 10.59.135.254	10.59.135.255
114	10.59.136.0/21	10.59.136.1 – 10.59.143.254	10.59.143.255
115	10.59.144.0/21	10.59.144.1 – 10.59.151.254	10.59.151.255
116	10.59.152.0/21	10.59.152.1 – 10.59.159.254	10.59.159.255
117	10.59.160.0/21	10.59.160.1 – 10.59.167.254	10.59.167.255
118	10.59.168.0/21	10.59.168.1 – 10.59.175.254	10.59.175.255
119	10.59.176.0/21	10.59.176.1 – 10.59.183.254	10.59.183.255
120	10.59.184.0/21	10.59.184.1 – 10.59.191.254	10.59.191.255
121	10.59.192.0/21	10.59.192.1 – 10.59.199.254	10.59.199.255
122	10.59.200.0/21	10.59.200.1 – 10.59.207.254	10.59.207.255
123	10.59.208.0/21	10.59.208.1 – 10.59.215.254	10.59.215.255
124	10.59.216.0/21	10.59.216.1 – 10.59.223.254	10.59.223.255
125	10.59.224.0/21	10.59.224.1 – 10.59.231.254	10.59.231.255
126	10.59.232.0/21	10.59.232.1 – 10.59.239.254	10.59.239.255
127	10.59.240.0/21	10.59.240.1 – 10.59.247.254	10.59.247.255
128	10.59.248.0/21	10.59.248.1 – 10.59.255.254	10.59.255.255
129	10.60.0.0/21	10.60.0.1 – 10.60.7.254	10.60.7.255
130	10.60.8.0/21	10.60.8.1 – 10.60.15.254	10.60.15.255
131	10.60.16.0/21	10.60.16.1 – 10.60.23.254	10.60.23.255
132	10.60.24.0/21	10.60.24.1 – 10.60.31.254	10.60.31.255
133	10.60.32.0/21	10.60.32.1 – 10.60.39.254	10.60.39.255
134	10.60.40.0/21	10.60.40.1 – 10.60.47.254	10.60.47.255
135	10.60.48.0/21	10.60.48.1 – 10.60.55.254	10.60.55.255
136	10.60.56.0/21	10.60.56.1 – 10.60.63.254	10.60.63.255
137	10.60.64.0/21	10.60.64.1 – 10.60.71.254	10.60.71.255
138	10.60.72.0/21	10.60.72.1 – 10.60.79.254	10.60.79.255
139	10.60.80.0/21	10.60.80.1 – 10.60.87.254	10.60.87.255
140	10.60.88.0/21	10.60.88.1 – 10.60.95.254	10.60.95.255
141	10.60.96.0/21	10.60.96.1 – 10.60.103.254	10.60.103.255
142	10.60.104.0/21	10.60.104.1 – 10.60.111.254	10.60.111.255
143	10.60.112.0/21	10.60.112.1 – 10.60.119.254	10.60.119.255
144	10.60.120.0/21	10.60.120.1 – 10.60.127.254	10.60.127.255
145	10.60.128.0/21	10.60.128.1 – 10.60.135.254	10.60.135.255
146	10.60.136.0/21	10.60.136.1 – 10.60.143.254	10.60.143.255
147	10.60.144.0/21	10.60.144.1 – 10.60.151.254	10.60.151.255
148	10.60.152.0/21	10.60.152.1 – 10.60.159.254	10.60.159.255
149	10.60.160.0/21	10.60.160.1 – 10.60.167.254	10.60.167.255
150	10.60.168.0/21	10.60.168.1 – 10.60.175.254	10.60.175.255
151	10.60.176.0/21	10.60.176.1 – 10.60.183.254	10.60.183.255
152	10.60.184.0/21	10.60.184.1 – 10.60.191.254	10.60.191.255
153	10.60.192.0/21	10.60.192.1 – 10.60.199.254	10.60.199.255
154	10.60.200.0/21	10.60.200.1 – 10.60.207.254	10.60.207.255
155	10.60.208.0/21	10.60.208.1 – 10.60.215.254	10.60.215.255
156	10.60.216.0/21	10.60.216.1 – 10.60.223.254	10.60.223.255
157	10.60.224.0/21	10.60.224.1 – 10.60.231.254	10.60.231.255
158	10.60.232.0/21	10.60.232.1 – 10.60.239.254	10.60.239.255
159	10.60.240.0/21	10.60.240.1 – 10.60.247.254	10.60.247.255
160	10.60.248.0/21	10.60.248.1 – 10.60.255.254	10.60.255.255
161	10.61.0.0/21	10.61.0.1 – 10.61.7.254	10.61.7.255
162	10.61.8.0/21	10.61.8.1 – 10.61.15.254	10.61.15.255
163	10.61.16.0/21	10.61.16.1 – 10.61.23.254	10.61.23.255
164	10.61.24.0/21	10.61.24.1 – 10.61.31.254	10.61.31.255
165	10.61.32.0/21	10.61.32.1 – 10.61.39.254	10.61.39.255
166	10.61.40.0/21	10.61.40.1 – 10.61.47.254	10.61.47.255
167	10.61.48.0/21	10.61.48.1 – 10.61.55.254	10.61.55.255
168	10.61.56.0/21	10.61.56.1 – 10.61.63.254	10.61.63.255
169	10.61.64.0/21	10.61.64.1 – 10.61.71.254	10.61.71.255
170	10.61.72.0/21	10.61.72.1 – 10.61.79.254	10.61.79.255
171	10.61.80.0/21	10.61.80.1 – 10.61.87.254	10.61.87.255
172	10.61.88.0/21	10.61.88.1 – 10.61.95.254	10.61.95.255
173	10.61.96.0/21	10.61.96.1 – 10.61.103.254	10.61.103.255
174	10.61.104.0/21	10.61.104.1 – 10.61.111.254	10.61.111.255
175	10.61.112.0/21	10.61.112.1 – 10.61.119.254	10.61.119.255
176	10.61.120.0/21	10.61.120.1 – 10.61.127.254	10.61.127.255
177	10.61.128.0/21	10.61.128.1 – 10.61.135.254	10.61.135.255
178	10.61.136.0/21	10.61.136.1 – 10.61.143.254	10.61.143.255
179	10.61.144.0/21	10.61.144.1 – 10.61.151.254	10.61.151.255
180	10.61.152.0/21	10.61.152.1 – 10.61.159.254	10.61.159.255
181	10.61.160.0/21	10.61.160.1 – 10.61.167.254	10.61.167.255
182	10.61.168.0/21	10.61.168.1 – 10.61.175.254	10.61.175.255
183	10.61.176.0/21	10.61.176.1 – 10.61.183.254	10.61.183.255
184	10.61.184.0/21	10.61.184.1 – 10.61.191.254	10.61.191.255
185	10.61.192.0/21	10.61.192.1 – 10.61.199.254	10.61.199.255
186	10.61.200.0/21	10.61.200.1 – 10.61.207.254	10.61.207.255
187	10.61.208.0/21	10.61.208.1 – 10.61.215.254	10.61.215.255
188	10.61.216.0/21	10.61.216.1 – 10.61.223.254	10.61.223.255
189	10.61.224.0/21	10.61.224.1 – 10.61.231.254	10.61.231.255
190	10.61.232.0/21	10.61.232.1 – 10.61.239.254	10.61.239.255
191	10.61.240.0/21	10.61.240.1 – 10.61.247.254	10.61.247.255
192	10.61.248.0/21	10.61.248.1 – 10.61.255.254	10.61.255.255
193	10.62.0.0/21	10.62.0.1 – 10.62.7.254	10.62.7.255
194	10.62.8.0/21	10.62.8.1 – 10.62.15.254	10.62.15.255
195	10.62.16.0/21	10.62.16.1 – 10.62.23.254	10.62.23.255
196	10.62.24.0/21	10.62.24.1 – 10.62.31.254	10.62.31.255
197	10.62.32.0/21	10.62.32.1 – 10.62.39.254	10.62.39.255
198	10.62.40.0/21	10.62.40.1 – 10.62.47.254	10.62.47.255
199	10.62.48.0/21	10.62.48.1 – 10.62.55.254	10.62.55.255
200	10.62.56.0/21	10.62.56.1 – 10.62.63.254	10.62.63.255
201	10.62.64.0/21	10.62.64.1 – 10.62.71.254	10.62.71.255
202	10.62.72.0/21	10.62.72.1 – 10.62.79.254	10.62.79.255
203	10.62.80.0/21	10.62.80.1 – 10.62.87.254	10.62.87.255
204	10.62.88.0/21	10.62.88.1 – 10.62.95.254	10.62.95.255
205	10.62.96.0/21	10.62.96.1 – 10.62.103.254	10.62.103.255
206	10.62.104.0/21	10.62.104.1 – 10.62.111.254	10.62.111.255
207	10.62.112.0/21	10.62.112.1 – 10.62.119.254	10.62.119.255
208	10.62.120.0/21	10.62.120.1 – 10.62.127.254	10.62.127.255
209	10.62.128.0/21	10.62.128.1 – 10.62.135.254	10.62.135.255
210	10.62.136.0/21	10.62.136.1 – 10.62.143.254	10.62.143.255
211	10.62.144.0/21	10.62.144.1 – 10.62.151.254	10.62.151.255
212	10.62.152.0/21	10.62.152.1 – 10.62.159.254	10.62.159.255
213	10.62.160.0/21	10.62.160.1 – 10.62.167.254	10.62.167.255
214	10.62.168.0/21	10.62.168.1 – 10.62.175.254	10.62.175.255
215	10.62.176.0/21	10.62.176.1 – 10.62.183.254	10.62.183.255
216	10.62.184.0/21	10.62.184.1 – 10.62.191.254	10.62.191.255
217	10.62.192.0/21	10.62.192.1 – 10.62.199.254	10.62.199.255
218	10.62.200.0/21	10.62.200.1 – 10.62.207.254	10.62.207.255
219	10.62.208.0/21	10.62.208.1 – 10.62.215.254	10.62.215.255
220	10.62.216.0/21	10.62.216.1 – 10.62.223.254	10.62.223.255
221	10.62.224.0/21	10.62.224.1 – 10.62.231.254	10.62.231.255
222	10.62.232.0/21	10.62.232.1 – 10.62.239.254	10.62.239.255
223	10.62.240.0/21	10.62.240.1 – 10.62.247.254	10.62.247.255
224	10.62.248.0/21	10.62.248.1 – 10.62.255.254	10.62.255.255
225	10.63.0.0/21	10.63.0.1 – 10.63.7.254	10.63.7.255
226	10.63.8.0/21	10.63.8.1 – 10.63.15.254	10.63.15.255
227	10.63.16.0/21	10.63.16.1 – 10.63.23.254	10.63.23.255
228	10.63.24.0/21	10.63.24.1 – 10.63.31.254	10.63.31.255
229	10.63.32.0/21	10.63.32.1 – 10.63.39.254	10.63.39.255
230	10.63.40.0/21	10.63.40.1 – 10.63.47.254	10.63.47.255
231	10.63.48.0/21	10.63.48.1 – 10.63.55.254	10.63.55.255
232	10.63.56.0/21	10.63.56.1 – 10.63.63.254	10.63.63.255
233	10.63.64.0/21	10.63.64.1 – 10.63.71.254	10.63.71.255
234	10.63.72.0/21	10.63.72.1 – 10.63.79.254	10.63.79.255
235	10.63.80.0/21	10.63.80.1 – 10.63.87.254	10.63.87.255
236	10.63.88.0/21	10.63.88.1 – 10.63.95.254	10.63.95.255
237	10.63.96.0/21	10.63.96.1 – 10.63.103.254	10.63.103.255
238	10.63.104.0/21	10.63.104.1 – 10.63.111.254	10.63.111.255
239	10.63.112.0/21	10.63.112.1 – 10.63.119.254	10.63.119.255
240	10.63.120.0/21	10.63.120.1 – 10.63.127.254	10.63.127.255
241	10.63.128.0/21	10.63.128.1 – 10.63.135.254	10.63.135.255
242	10.63.136.0/21	10.63.136.1 – 10.63.143.254	10.63.143.255
243	10.63.144.0/21	10.63.144.1 – 10.63.151.254	10.63.151.255
244	10.63.152.0/21	10.63.152.1 – 10.63.159.254	10.63.159.255
245	10.63.160.0/21	10.63.160.1 – 10.63.167.254	10.63.167.255
246	10.63.168.0/21	10.63.168.1 – 10.63.175.254	10.63.175.255
247	10.63.176.0/21	10.63.176.1 – 10.63.183.254	10.63.183.255
248	10.63.184.0/21	10.63.184.1 – 10.63.191.254	10.63.191.255
249	10.63.192.0/21	10.63.192.1 – 10.63.199.254	10.63.199.255
250	10.63.200.0/21	10.63.200.1 – 10.63.207.254	10.63.207.255
251	10.63.208.0/21	10.63.208.1 – 10.63.215.254	10.63.215.255
252	10.63.216.0/21	10.63.216.1 – 10.63.223.254	10.63.223.255
253	10.63.224.0/21	10.63.224.1 – 10.63.231.254	10.63.231.255
254	10.63.232.0/21	10.63.232.1 – 10.63.239.254	10.63.239.255
255	10.63.240.0/21	10.63.240.1 – 10.63.247.254	10.63.247.255
256	10.63.248.0/21	10.63.248.1 – 10.63.255.254	10.63.255.255

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 /13
/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	1
/14	255.252.0.0	262,144	262,142	2 split →
/15	255.254.0.0	131,072	131,070	4 split →
/16	255.255.0.0	65,536	65,534	8 split →
/17	255.255.128.0	32,768	32,766	16 split →
/18	255.255.192.0	16,384	16,382	32 split →
/19	255.255.224.0	8,192	8,190	64 split →
/20	255.255.240.0	4,096	4,094	128 split →
/21	255.255.248.0	2,048	2,046	256 split →
/22	255.255.252.0	1,024	1,022	512 split →
/23	255.255.254.0	512	510	1,024 split →
/24	255.255.255.0	256	254	2,048 split →
/25	255.255.255.128	128	126	4,096 split →
/26	255.255.255.192	64	62	8,192 split →
/27	255.255.255.224	32	30	16,384 split →
/28	255.255.255.240	16	14	32,768 split →
/29	255.255.255.248	8	6	65,536 split →
/30	255.255.255.252	4	2	131,072 split →
/31	255.255.255.254	2	2	262,144 split →
/32	255.255.255.255	1	1	524,288 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 →