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)10.32.0.0/12

network10.32.0.0/12

broadcast10.47.255.255

first host10.32.0.1

last host10.47.255.254

subnet mask255.240.0.0

wildcard0.15.255.255

addresses1,048,576

usable hosts1,048,574

classA

ipcalc 10.32.0.0/12

address00001010.00100000.00000000.00000000

subnet mask11111111.11110000.00000000.00000000

network00001010.00100000.00000000.00000000

broadcast00001010.00101111.11111111.11111111

green = network part, grey = host part

hex0x0a200000

decimal169869312

reverse dns0.0.32.10.in-addr.arpa

ipv4-mapped::ffff:a20:0

/12 split into /19 · 128 subnets

close ×

#	network	host range	broadcast
1	10.32.0.0/19	10.32.0.1 – 10.32.31.254	10.32.31.255
2	10.32.32.0/19	10.32.32.1 – 10.32.63.254	10.32.63.255
3	10.32.64.0/19	10.32.64.1 – 10.32.95.254	10.32.95.255
4	10.32.96.0/19	10.32.96.1 – 10.32.127.254	10.32.127.255
5	10.32.128.0/19	10.32.128.1 – 10.32.159.254	10.32.159.255
6	10.32.160.0/19	10.32.160.1 – 10.32.191.254	10.32.191.255
7	10.32.192.0/19	10.32.192.1 – 10.32.223.254	10.32.223.255
8	10.32.224.0/19	10.32.224.1 – 10.32.255.254	10.32.255.255
9	10.33.0.0/19	10.33.0.1 – 10.33.31.254	10.33.31.255
10	10.33.32.0/19	10.33.32.1 – 10.33.63.254	10.33.63.255
11	10.33.64.0/19	10.33.64.1 – 10.33.95.254	10.33.95.255
12	10.33.96.0/19	10.33.96.1 – 10.33.127.254	10.33.127.255
13	10.33.128.0/19	10.33.128.1 – 10.33.159.254	10.33.159.255
14	10.33.160.0/19	10.33.160.1 – 10.33.191.254	10.33.191.255
15	10.33.192.0/19	10.33.192.1 – 10.33.223.254	10.33.223.255
16	10.33.224.0/19	10.33.224.1 – 10.33.255.254	10.33.255.255
17	10.34.0.0/19	10.34.0.1 – 10.34.31.254	10.34.31.255
18	10.34.32.0/19	10.34.32.1 – 10.34.63.254	10.34.63.255
19	10.34.64.0/19	10.34.64.1 – 10.34.95.254	10.34.95.255
20	10.34.96.0/19	10.34.96.1 – 10.34.127.254	10.34.127.255
21	10.34.128.0/19	10.34.128.1 – 10.34.159.254	10.34.159.255
22	10.34.160.0/19	10.34.160.1 – 10.34.191.254	10.34.191.255
23	10.34.192.0/19	10.34.192.1 – 10.34.223.254	10.34.223.255
24	10.34.224.0/19	10.34.224.1 – 10.34.255.254	10.34.255.255
25	10.35.0.0/19	10.35.0.1 – 10.35.31.254	10.35.31.255
26	10.35.32.0/19	10.35.32.1 – 10.35.63.254	10.35.63.255
27	10.35.64.0/19	10.35.64.1 – 10.35.95.254	10.35.95.255
28	10.35.96.0/19	10.35.96.1 – 10.35.127.254	10.35.127.255
29	10.35.128.0/19	10.35.128.1 – 10.35.159.254	10.35.159.255
30	10.35.160.0/19	10.35.160.1 – 10.35.191.254	10.35.191.255
31	10.35.192.0/19	10.35.192.1 – 10.35.223.254	10.35.223.255
32	10.35.224.0/19	10.35.224.1 – 10.35.255.254	10.35.255.255
33	10.36.0.0/19	10.36.0.1 – 10.36.31.254	10.36.31.255
34	10.36.32.0/19	10.36.32.1 – 10.36.63.254	10.36.63.255
35	10.36.64.0/19	10.36.64.1 – 10.36.95.254	10.36.95.255
36	10.36.96.0/19	10.36.96.1 – 10.36.127.254	10.36.127.255
37	10.36.128.0/19	10.36.128.1 – 10.36.159.254	10.36.159.255
38	10.36.160.0/19	10.36.160.1 – 10.36.191.254	10.36.191.255
39	10.36.192.0/19	10.36.192.1 – 10.36.223.254	10.36.223.255
40	10.36.224.0/19	10.36.224.1 – 10.36.255.254	10.36.255.255
41	10.37.0.0/19	10.37.0.1 – 10.37.31.254	10.37.31.255
42	10.37.32.0/19	10.37.32.1 – 10.37.63.254	10.37.63.255
43	10.37.64.0/19	10.37.64.1 – 10.37.95.254	10.37.95.255
44	10.37.96.0/19	10.37.96.1 – 10.37.127.254	10.37.127.255
45	10.37.128.0/19	10.37.128.1 – 10.37.159.254	10.37.159.255
46	10.37.160.0/19	10.37.160.1 – 10.37.191.254	10.37.191.255
47	10.37.192.0/19	10.37.192.1 – 10.37.223.254	10.37.223.255
48	10.37.224.0/19	10.37.224.1 – 10.37.255.254	10.37.255.255
49	10.38.0.0/19	10.38.0.1 – 10.38.31.254	10.38.31.255
50	10.38.32.0/19	10.38.32.1 – 10.38.63.254	10.38.63.255
51	10.38.64.0/19	10.38.64.1 – 10.38.95.254	10.38.95.255
52	10.38.96.0/19	10.38.96.1 – 10.38.127.254	10.38.127.255
53	10.38.128.0/19	10.38.128.1 – 10.38.159.254	10.38.159.255
54	10.38.160.0/19	10.38.160.1 – 10.38.191.254	10.38.191.255
55	10.38.192.0/19	10.38.192.1 – 10.38.223.254	10.38.223.255
56	10.38.224.0/19	10.38.224.1 – 10.38.255.254	10.38.255.255
57	10.39.0.0/19	10.39.0.1 – 10.39.31.254	10.39.31.255
58	10.39.32.0/19	10.39.32.1 – 10.39.63.254	10.39.63.255
59	10.39.64.0/19	10.39.64.1 – 10.39.95.254	10.39.95.255
60	10.39.96.0/19	10.39.96.1 – 10.39.127.254	10.39.127.255
61	10.39.128.0/19	10.39.128.1 – 10.39.159.254	10.39.159.255
62	10.39.160.0/19	10.39.160.1 – 10.39.191.254	10.39.191.255
63	10.39.192.0/19	10.39.192.1 – 10.39.223.254	10.39.223.255
64	10.39.224.0/19	10.39.224.1 – 10.39.255.254	10.39.255.255
65	10.40.0.0/19	10.40.0.1 – 10.40.31.254	10.40.31.255
66	10.40.32.0/19	10.40.32.1 – 10.40.63.254	10.40.63.255
67	10.40.64.0/19	10.40.64.1 – 10.40.95.254	10.40.95.255
68	10.40.96.0/19	10.40.96.1 – 10.40.127.254	10.40.127.255
69	10.40.128.0/19	10.40.128.1 – 10.40.159.254	10.40.159.255
70	10.40.160.0/19	10.40.160.1 – 10.40.191.254	10.40.191.255
71	10.40.192.0/19	10.40.192.1 – 10.40.223.254	10.40.223.255
72	10.40.224.0/19	10.40.224.1 – 10.40.255.254	10.40.255.255
73	10.41.0.0/19	10.41.0.1 – 10.41.31.254	10.41.31.255
74	10.41.32.0/19	10.41.32.1 – 10.41.63.254	10.41.63.255
75	10.41.64.0/19	10.41.64.1 – 10.41.95.254	10.41.95.255
76	10.41.96.0/19	10.41.96.1 – 10.41.127.254	10.41.127.255
77	10.41.128.0/19	10.41.128.1 – 10.41.159.254	10.41.159.255
78	10.41.160.0/19	10.41.160.1 – 10.41.191.254	10.41.191.255
79	10.41.192.0/19	10.41.192.1 – 10.41.223.254	10.41.223.255
80	10.41.224.0/19	10.41.224.1 – 10.41.255.254	10.41.255.255
81	10.42.0.0/19	10.42.0.1 – 10.42.31.254	10.42.31.255
82	10.42.32.0/19	10.42.32.1 – 10.42.63.254	10.42.63.255
83	10.42.64.0/19	10.42.64.1 – 10.42.95.254	10.42.95.255
84	10.42.96.0/19	10.42.96.1 – 10.42.127.254	10.42.127.255
85	10.42.128.0/19	10.42.128.1 – 10.42.159.254	10.42.159.255
86	10.42.160.0/19	10.42.160.1 – 10.42.191.254	10.42.191.255
87	10.42.192.0/19	10.42.192.1 – 10.42.223.254	10.42.223.255
88	10.42.224.0/19	10.42.224.1 – 10.42.255.254	10.42.255.255
89	10.43.0.0/19	10.43.0.1 – 10.43.31.254	10.43.31.255
90	10.43.32.0/19	10.43.32.1 – 10.43.63.254	10.43.63.255
91	10.43.64.0/19	10.43.64.1 – 10.43.95.254	10.43.95.255
92	10.43.96.0/19	10.43.96.1 – 10.43.127.254	10.43.127.255
93	10.43.128.0/19	10.43.128.1 – 10.43.159.254	10.43.159.255
94	10.43.160.0/19	10.43.160.1 – 10.43.191.254	10.43.191.255
95	10.43.192.0/19	10.43.192.1 – 10.43.223.254	10.43.223.255
96	10.43.224.0/19	10.43.224.1 – 10.43.255.254	10.43.255.255
97	10.44.0.0/19	10.44.0.1 – 10.44.31.254	10.44.31.255
98	10.44.32.0/19	10.44.32.1 – 10.44.63.254	10.44.63.255
99	10.44.64.0/19	10.44.64.1 – 10.44.95.254	10.44.95.255
100	10.44.96.0/19	10.44.96.1 – 10.44.127.254	10.44.127.255
101	10.44.128.0/19	10.44.128.1 – 10.44.159.254	10.44.159.255
102	10.44.160.0/19	10.44.160.1 – 10.44.191.254	10.44.191.255
103	10.44.192.0/19	10.44.192.1 – 10.44.223.254	10.44.223.255
104	10.44.224.0/19	10.44.224.1 – 10.44.255.254	10.44.255.255
105	10.45.0.0/19	10.45.0.1 – 10.45.31.254	10.45.31.255
106	10.45.32.0/19	10.45.32.1 – 10.45.63.254	10.45.63.255
107	10.45.64.0/19	10.45.64.1 – 10.45.95.254	10.45.95.255
108	10.45.96.0/19	10.45.96.1 – 10.45.127.254	10.45.127.255
109	10.45.128.0/19	10.45.128.1 – 10.45.159.254	10.45.159.255
110	10.45.160.0/19	10.45.160.1 – 10.45.191.254	10.45.191.255
111	10.45.192.0/19	10.45.192.1 – 10.45.223.254	10.45.223.255
112	10.45.224.0/19	10.45.224.1 – 10.45.255.254	10.45.255.255
113	10.46.0.0/19	10.46.0.1 – 10.46.31.254	10.46.31.255
114	10.46.32.0/19	10.46.32.1 – 10.46.63.254	10.46.63.255
115	10.46.64.0/19	10.46.64.1 – 10.46.95.254	10.46.95.255
116	10.46.96.0/19	10.46.96.1 – 10.46.127.254	10.46.127.255
117	10.46.128.0/19	10.46.128.1 – 10.46.159.254	10.46.159.255
118	10.46.160.0/19	10.46.160.1 – 10.46.191.254	10.46.191.255
119	10.46.192.0/19	10.46.192.1 – 10.46.223.254	10.46.223.255
120	10.46.224.0/19	10.46.224.1 – 10.46.255.254	10.46.255.255
121	10.47.0.0/19	10.47.0.1 – 10.47.31.254	10.47.31.255
122	10.47.32.0/19	10.47.32.1 – 10.47.63.254	10.47.63.255
123	10.47.64.0/19	10.47.64.1 – 10.47.95.254	10.47.95.255
124	10.47.96.0/19	10.47.96.1 – 10.47.127.254	10.47.127.255
125	10.47.128.0/19	10.47.128.1 – 10.47.159.254	10.47.159.255
126	10.47.160.0/19	10.47.160.1 – 10.47.191.254	10.47.191.255
127	10.47.192.0/19	10.47.192.1 – 10.47.223.254	10.47.223.255
128	10.47.224.0/19	10.47.224.1 – 10.47.255.254	10.47.255.255

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 /12
/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	1
/13	255.248.0.0	524,288	524,286	2 split →
/14	255.252.0.0	262,144	262,142	4 split →
/15	255.254.0.0	131,072	131,070	8 split →
/16	255.255.0.0	65,536	65,534	16 split →
/17	255.255.128.0	32,768	32,766	32 split →
/18	255.255.192.0	16,384	16,382	64 split →
/19	255.255.224.0	8,192	8,190	128 split →
/20	255.255.240.0	4,096	4,094	256 split →
/21	255.255.248.0	2,048	2,046	512 split →
/22	255.255.252.0	1,024	1,022	1,024 split →
/23	255.255.254.0	512	510	2,048 split →
/24	255.255.255.0	256	254	4,096 split →
/25	255.255.255.128	128	126	8,192 split →
/26	255.255.255.192	64	62	16,384 split →
/27	255.255.255.224	32	30	32,768 split →
/28	255.255.255.240	16	14	65,536 split →
/29	255.255.255.248	8	6	131,072 split →
/30	255.255.255.252	4	2	262,144 split →
/31	255.255.255.254	2	2	524,288 split →
/32	255.255.255.255	1	1	1,048,576 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 →