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)10.48.0.0/12

network10.48.0.0/12

broadcast10.63.255.255

first host10.48.0.1

last host10.63.255.254

subnet mask255.240.0.0

wildcard0.15.255.255

addresses1,048,576

usable hosts1,048,574

classA

ipcalc 10.48.0.0/12

address00001010.00110000.00000000.00000000

subnet mask11111111.11110000.00000000.00000000

network00001010.00110000.00000000.00000000

broadcast00001010.00111111.11111111.11111111

green = network part, grey = host part

hex0x0a300000

decimal170917888

reverse dns0.0.48.10.in-addr.arpa

ipv4-mapped::ffff:a30:0

/12 split into /19 · 128 subnets

close ×

#	network	host range	broadcast
1	10.48.0.0/19	10.48.0.1 – 10.48.31.254	10.48.31.255
2	10.48.32.0/19	10.48.32.1 – 10.48.63.254	10.48.63.255
3	10.48.64.0/19	10.48.64.1 – 10.48.95.254	10.48.95.255
4	10.48.96.0/19	10.48.96.1 – 10.48.127.254	10.48.127.255
5	10.48.128.0/19	10.48.128.1 – 10.48.159.254	10.48.159.255
6	10.48.160.0/19	10.48.160.1 – 10.48.191.254	10.48.191.255
7	10.48.192.0/19	10.48.192.1 – 10.48.223.254	10.48.223.255
8	10.48.224.0/19	10.48.224.1 – 10.48.255.254	10.48.255.255
9	10.49.0.0/19	10.49.0.1 – 10.49.31.254	10.49.31.255
10	10.49.32.0/19	10.49.32.1 – 10.49.63.254	10.49.63.255
11	10.49.64.0/19	10.49.64.1 – 10.49.95.254	10.49.95.255
12	10.49.96.0/19	10.49.96.1 – 10.49.127.254	10.49.127.255
13	10.49.128.0/19	10.49.128.1 – 10.49.159.254	10.49.159.255
14	10.49.160.0/19	10.49.160.1 – 10.49.191.254	10.49.191.255
15	10.49.192.0/19	10.49.192.1 – 10.49.223.254	10.49.223.255
16	10.49.224.0/19	10.49.224.1 – 10.49.255.254	10.49.255.255
17	10.50.0.0/19	10.50.0.1 – 10.50.31.254	10.50.31.255
18	10.50.32.0/19	10.50.32.1 – 10.50.63.254	10.50.63.255
19	10.50.64.0/19	10.50.64.1 – 10.50.95.254	10.50.95.255
20	10.50.96.0/19	10.50.96.1 – 10.50.127.254	10.50.127.255
21	10.50.128.0/19	10.50.128.1 – 10.50.159.254	10.50.159.255
22	10.50.160.0/19	10.50.160.1 – 10.50.191.254	10.50.191.255
23	10.50.192.0/19	10.50.192.1 – 10.50.223.254	10.50.223.255
24	10.50.224.0/19	10.50.224.1 – 10.50.255.254	10.50.255.255
25	10.51.0.0/19	10.51.0.1 – 10.51.31.254	10.51.31.255
26	10.51.32.0/19	10.51.32.1 – 10.51.63.254	10.51.63.255
27	10.51.64.0/19	10.51.64.1 – 10.51.95.254	10.51.95.255
28	10.51.96.0/19	10.51.96.1 – 10.51.127.254	10.51.127.255
29	10.51.128.0/19	10.51.128.1 – 10.51.159.254	10.51.159.255
30	10.51.160.0/19	10.51.160.1 – 10.51.191.254	10.51.191.255
31	10.51.192.0/19	10.51.192.1 – 10.51.223.254	10.51.223.255
32	10.51.224.0/19	10.51.224.1 – 10.51.255.254	10.51.255.255
33	10.52.0.0/19	10.52.0.1 – 10.52.31.254	10.52.31.255
34	10.52.32.0/19	10.52.32.1 – 10.52.63.254	10.52.63.255
35	10.52.64.0/19	10.52.64.1 – 10.52.95.254	10.52.95.255
36	10.52.96.0/19	10.52.96.1 – 10.52.127.254	10.52.127.255
37	10.52.128.0/19	10.52.128.1 – 10.52.159.254	10.52.159.255
38	10.52.160.0/19	10.52.160.1 – 10.52.191.254	10.52.191.255
39	10.52.192.0/19	10.52.192.1 – 10.52.223.254	10.52.223.255
40	10.52.224.0/19	10.52.224.1 – 10.52.255.254	10.52.255.255
41	10.53.0.0/19	10.53.0.1 – 10.53.31.254	10.53.31.255
42	10.53.32.0/19	10.53.32.1 – 10.53.63.254	10.53.63.255
43	10.53.64.0/19	10.53.64.1 – 10.53.95.254	10.53.95.255
44	10.53.96.0/19	10.53.96.1 – 10.53.127.254	10.53.127.255
45	10.53.128.0/19	10.53.128.1 – 10.53.159.254	10.53.159.255
46	10.53.160.0/19	10.53.160.1 – 10.53.191.254	10.53.191.255
47	10.53.192.0/19	10.53.192.1 – 10.53.223.254	10.53.223.255
48	10.53.224.0/19	10.53.224.1 – 10.53.255.254	10.53.255.255
49	10.54.0.0/19	10.54.0.1 – 10.54.31.254	10.54.31.255
50	10.54.32.0/19	10.54.32.1 – 10.54.63.254	10.54.63.255
51	10.54.64.0/19	10.54.64.1 – 10.54.95.254	10.54.95.255
52	10.54.96.0/19	10.54.96.1 – 10.54.127.254	10.54.127.255
53	10.54.128.0/19	10.54.128.1 – 10.54.159.254	10.54.159.255
54	10.54.160.0/19	10.54.160.1 – 10.54.191.254	10.54.191.255
55	10.54.192.0/19	10.54.192.1 – 10.54.223.254	10.54.223.255
56	10.54.224.0/19	10.54.224.1 – 10.54.255.254	10.54.255.255
57	10.55.0.0/19	10.55.0.1 – 10.55.31.254	10.55.31.255
58	10.55.32.0/19	10.55.32.1 – 10.55.63.254	10.55.63.255
59	10.55.64.0/19	10.55.64.1 – 10.55.95.254	10.55.95.255
60	10.55.96.0/19	10.55.96.1 – 10.55.127.254	10.55.127.255
61	10.55.128.0/19	10.55.128.1 – 10.55.159.254	10.55.159.255
62	10.55.160.0/19	10.55.160.1 – 10.55.191.254	10.55.191.255
63	10.55.192.0/19	10.55.192.1 – 10.55.223.254	10.55.223.255
64	10.55.224.0/19	10.55.224.1 – 10.55.255.254	10.55.255.255
65	10.56.0.0/19	10.56.0.1 – 10.56.31.254	10.56.31.255
66	10.56.32.0/19	10.56.32.1 – 10.56.63.254	10.56.63.255
67	10.56.64.0/19	10.56.64.1 – 10.56.95.254	10.56.95.255
68	10.56.96.0/19	10.56.96.1 – 10.56.127.254	10.56.127.255
69	10.56.128.0/19	10.56.128.1 – 10.56.159.254	10.56.159.255
70	10.56.160.0/19	10.56.160.1 – 10.56.191.254	10.56.191.255
71	10.56.192.0/19	10.56.192.1 – 10.56.223.254	10.56.223.255
72	10.56.224.0/19	10.56.224.1 – 10.56.255.254	10.56.255.255
73	10.57.0.0/19	10.57.0.1 – 10.57.31.254	10.57.31.255
74	10.57.32.0/19	10.57.32.1 – 10.57.63.254	10.57.63.255
75	10.57.64.0/19	10.57.64.1 – 10.57.95.254	10.57.95.255
76	10.57.96.0/19	10.57.96.1 – 10.57.127.254	10.57.127.255
77	10.57.128.0/19	10.57.128.1 – 10.57.159.254	10.57.159.255
78	10.57.160.0/19	10.57.160.1 – 10.57.191.254	10.57.191.255
79	10.57.192.0/19	10.57.192.1 – 10.57.223.254	10.57.223.255
80	10.57.224.0/19	10.57.224.1 – 10.57.255.254	10.57.255.255
81	10.58.0.0/19	10.58.0.1 – 10.58.31.254	10.58.31.255
82	10.58.32.0/19	10.58.32.1 – 10.58.63.254	10.58.63.255
83	10.58.64.0/19	10.58.64.1 – 10.58.95.254	10.58.95.255
84	10.58.96.0/19	10.58.96.1 – 10.58.127.254	10.58.127.255
85	10.58.128.0/19	10.58.128.1 – 10.58.159.254	10.58.159.255
86	10.58.160.0/19	10.58.160.1 – 10.58.191.254	10.58.191.255
87	10.58.192.0/19	10.58.192.1 – 10.58.223.254	10.58.223.255
88	10.58.224.0/19	10.58.224.1 – 10.58.255.254	10.58.255.255
89	10.59.0.0/19	10.59.0.1 – 10.59.31.254	10.59.31.255
90	10.59.32.0/19	10.59.32.1 – 10.59.63.254	10.59.63.255
91	10.59.64.0/19	10.59.64.1 – 10.59.95.254	10.59.95.255
92	10.59.96.0/19	10.59.96.1 – 10.59.127.254	10.59.127.255
93	10.59.128.0/19	10.59.128.1 – 10.59.159.254	10.59.159.255
94	10.59.160.0/19	10.59.160.1 – 10.59.191.254	10.59.191.255
95	10.59.192.0/19	10.59.192.1 – 10.59.223.254	10.59.223.255
96	10.59.224.0/19	10.59.224.1 – 10.59.255.254	10.59.255.255
97	10.60.0.0/19	10.60.0.1 – 10.60.31.254	10.60.31.255
98	10.60.32.0/19	10.60.32.1 – 10.60.63.254	10.60.63.255
99	10.60.64.0/19	10.60.64.1 – 10.60.95.254	10.60.95.255
100	10.60.96.0/19	10.60.96.1 – 10.60.127.254	10.60.127.255
101	10.60.128.0/19	10.60.128.1 – 10.60.159.254	10.60.159.255
102	10.60.160.0/19	10.60.160.1 – 10.60.191.254	10.60.191.255
103	10.60.192.0/19	10.60.192.1 – 10.60.223.254	10.60.223.255
104	10.60.224.0/19	10.60.224.1 – 10.60.255.254	10.60.255.255
105	10.61.0.0/19	10.61.0.1 – 10.61.31.254	10.61.31.255
106	10.61.32.0/19	10.61.32.1 – 10.61.63.254	10.61.63.255
107	10.61.64.0/19	10.61.64.1 – 10.61.95.254	10.61.95.255
108	10.61.96.0/19	10.61.96.1 – 10.61.127.254	10.61.127.255
109	10.61.128.0/19	10.61.128.1 – 10.61.159.254	10.61.159.255
110	10.61.160.0/19	10.61.160.1 – 10.61.191.254	10.61.191.255
111	10.61.192.0/19	10.61.192.1 – 10.61.223.254	10.61.223.255
112	10.61.224.0/19	10.61.224.1 – 10.61.255.254	10.61.255.255
113	10.62.0.0/19	10.62.0.1 – 10.62.31.254	10.62.31.255
114	10.62.32.0/19	10.62.32.1 – 10.62.63.254	10.62.63.255
115	10.62.64.0/19	10.62.64.1 – 10.62.95.254	10.62.95.255
116	10.62.96.0/19	10.62.96.1 – 10.62.127.254	10.62.127.255
117	10.62.128.0/19	10.62.128.1 – 10.62.159.254	10.62.159.255
118	10.62.160.0/19	10.62.160.1 – 10.62.191.254	10.62.191.255
119	10.62.192.0/19	10.62.192.1 – 10.62.223.254	10.62.223.255
120	10.62.224.0/19	10.62.224.1 – 10.62.255.254	10.62.255.255
121	10.63.0.0/19	10.63.0.1 – 10.63.31.254	10.63.31.255
122	10.63.32.0/19	10.63.32.1 – 10.63.63.254	10.63.63.255
123	10.63.64.0/19	10.63.64.1 – 10.63.95.254	10.63.95.255
124	10.63.96.0/19	10.63.96.1 – 10.63.127.254	10.63.127.255
125	10.63.128.0/19	10.63.128.1 – 10.63.159.254	10.63.159.255
126	10.63.160.0/19	10.63.160.1 – 10.63.191.254	10.63.191.255
127	10.63.192.0/19	10.63.192.1 – 10.63.223.254	10.63.223.255
128	10.63.224.0/19	10.63.224.1 – 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 /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 →