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)10.18.192.0/19

network10.18.192.0/19

broadcast10.18.223.255

first host10.18.192.1

last host10.18.223.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.18.192.0/19

address00001010.00010010.11000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010010.11000000.00000000

broadcast00001010.00010010.11011111.11111111

green = network part, grey = host part

hex0x0a12c000

decimal169000960

reverse dns0.192.18.10.in-addr.arpa

ipv4-mapped::ffff:a12:c000

/19 split into /26 · 128 subnets

close ×

#	network	host range	broadcast
1	10.18.192.0/26	10.18.192.1 – 10.18.192.62	10.18.192.63
2	10.18.192.64/26	10.18.192.65 – 10.18.192.126	10.18.192.127
3	10.18.192.128/26	10.18.192.129 – 10.18.192.190	10.18.192.191
4	10.18.192.192/26	10.18.192.193 – 10.18.192.254	10.18.192.255
5	10.18.193.0/26	10.18.193.1 – 10.18.193.62	10.18.193.63
6	10.18.193.64/26	10.18.193.65 – 10.18.193.126	10.18.193.127
7	10.18.193.128/26	10.18.193.129 – 10.18.193.190	10.18.193.191
8	10.18.193.192/26	10.18.193.193 – 10.18.193.254	10.18.193.255
9	10.18.194.0/26	10.18.194.1 – 10.18.194.62	10.18.194.63
10	10.18.194.64/26	10.18.194.65 – 10.18.194.126	10.18.194.127
11	10.18.194.128/26	10.18.194.129 – 10.18.194.190	10.18.194.191
12	10.18.194.192/26	10.18.194.193 – 10.18.194.254	10.18.194.255
13	10.18.195.0/26	10.18.195.1 – 10.18.195.62	10.18.195.63
14	10.18.195.64/26	10.18.195.65 – 10.18.195.126	10.18.195.127
15	10.18.195.128/26	10.18.195.129 – 10.18.195.190	10.18.195.191
16	10.18.195.192/26	10.18.195.193 – 10.18.195.254	10.18.195.255
17	10.18.196.0/26	10.18.196.1 – 10.18.196.62	10.18.196.63
18	10.18.196.64/26	10.18.196.65 – 10.18.196.126	10.18.196.127
19	10.18.196.128/26	10.18.196.129 – 10.18.196.190	10.18.196.191
20	10.18.196.192/26	10.18.196.193 – 10.18.196.254	10.18.196.255
21	10.18.197.0/26	10.18.197.1 – 10.18.197.62	10.18.197.63
22	10.18.197.64/26	10.18.197.65 – 10.18.197.126	10.18.197.127
23	10.18.197.128/26	10.18.197.129 – 10.18.197.190	10.18.197.191
24	10.18.197.192/26	10.18.197.193 – 10.18.197.254	10.18.197.255
25	10.18.198.0/26	10.18.198.1 – 10.18.198.62	10.18.198.63
26	10.18.198.64/26	10.18.198.65 – 10.18.198.126	10.18.198.127
27	10.18.198.128/26	10.18.198.129 – 10.18.198.190	10.18.198.191
28	10.18.198.192/26	10.18.198.193 – 10.18.198.254	10.18.198.255
29	10.18.199.0/26	10.18.199.1 – 10.18.199.62	10.18.199.63
30	10.18.199.64/26	10.18.199.65 – 10.18.199.126	10.18.199.127
31	10.18.199.128/26	10.18.199.129 – 10.18.199.190	10.18.199.191
32	10.18.199.192/26	10.18.199.193 – 10.18.199.254	10.18.199.255
33	10.18.200.0/26	10.18.200.1 – 10.18.200.62	10.18.200.63
34	10.18.200.64/26	10.18.200.65 – 10.18.200.126	10.18.200.127
35	10.18.200.128/26	10.18.200.129 – 10.18.200.190	10.18.200.191
36	10.18.200.192/26	10.18.200.193 – 10.18.200.254	10.18.200.255
37	10.18.201.0/26	10.18.201.1 – 10.18.201.62	10.18.201.63
38	10.18.201.64/26	10.18.201.65 – 10.18.201.126	10.18.201.127
39	10.18.201.128/26	10.18.201.129 – 10.18.201.190	10.18.201.191
40	10.18.201.192/26	10.18.201.193 – 10.18.201.254	10.18.201.255
41	10.18.202.0/26	10.18.202.1 – 10.18.202.62	10.18.202.63
42	10.18.202.64/26	10.18.202.65 – 10.18.202.126	10.18.202.127
43	10.18.202.128/26	10.18.202.129 – 10.18.202.190	10.18.202.191
44	10.18.202.192/26	10.18.202.193 – 10.18.202.254	10.18.202.255
45	10.18.203.0/26	10.18.203.1 – 10.18.203.62	10.18.203.63
46	10.18.203.64/26	10.18.203.65 – 10.18.203.126	10.18.203.127
47	10.18.203.128/26	10.18.203.129 – 10.18.203.190	10.18.203.191
48	10.18.203.192/26	10.18.203.193 – 10.18.203.254	10.18.203.255
49	10.18.204.0/26	10.18.204.1 – 10.18.204.62	10.18.204.63
50	10.18.204.64/26	10.18.204.65 – 10.18.204.126	10.18.204.127
51	10.18.204.128/26	10.18.204.129 – 10.18.204.190	10.18.204.191
52	10.18.204.192/26	10.18.204.193 – 10.18.204.254	10.18.204.255
53	10.18.205.0/26	10.18.205.1 – 10.18.205.62	10.18.205.63
54	10.18.205.64/26	10.18.205.65 – 10.18.205.126	10.18.205.127
55	10.18.205.128/26	10.18.205.129 – 10.18.205.190	10.18.205.191
56	10.18.205.192/26	10.18.205.193 – 10.18.205.254	10.18.205.255
57	10.18.206.0/26	10.18.206.1 – 10.18.206.62	10.18.206.63
58	10.18.206.64/26	10.18.206.65 – 10.18.206.126	10.18.206.127
59	10.18.206.128/26	10.18.206.129 – 10.18.206.190	10.18.206.191
60	10.18.206.192/26	10.18.206.193 – 10.18.206.254	10.18.206.255
61	10.18.207.0/26	10.18.207.1 – 10.18.207.62	10.18.207.63
62	10.18.207.64/26	10.18.207.65 – 10.18.207.126	10.18.207.127
63	10.18.207.128/26	10.18.207.129 – 10.18.207.190	10.18.207.191
64	10.18.207.192/26	10.18.207.193 – 10.18.207.254	10.18.207.255
65	10.18.208.0/26	10.18.208.1 – 10.18.208.62	10.18.208.63
66	10.18.208.64/26	10.18.208.65 – 10.18.208.126	10.18.208.127
67	10.18.208.128/26	10.18.208.129 – 10.18.208.190	10.18.208.191
68	10.18.208.192/26	10.18.208.193 – 10.18.208.254	10.18.208.255
69	10.18.209.0/26	10.18.209.1 – 10.18.209.62	10.18.209.63
70	10.18.209.64/26	10.18.209.65 – 10.18.209.126	10.18.209.127
71	10.18.209.128/26	10.18.209.129 – 10.18.209.190	10.18.209.191
72	10.18.209.192/26	10.18.209.193 – 10.18.209.254	10.18.209.255
73	10.18.210.0/26	10.18.210.1 – 10.18.210.62	10.18.210.63
74	10.18.210.64/26	10.18.210.65 – 10.18.210.126	10.18.210.127
75	10.18.210.128/26	10.18.210.129 – 10.18.210.190	10.18.210.191
76	10.18.210.192/26	10.18.210.193 – 10.18.210.254	10.18.210.255
77	10.18.211.0/26	10.18.211.1 – 10.18.211.62	10.18.211.63
78	10.18.211.64/26	10.18.211.65 – 10.18.211.126	10.18.211.127
79	10.18.211.128/26	10.18.211.129 – 10.18.211.190	10.18.211.191
80	10.18.211.192/26	10.18.211.193 – 10.18.211.254	10.18.211.255
81	10.18.212.0/26	10.18.212.1 – 10.18.212.62	10.18.212.63
82	10.18.212.64/26	10.18.212.65 – 10.18.212.126	10.18.212.127
83	10.18.212.128/26	10.18.212.129 – 10.18.212.190	10.18.212.191
84	10.18.212.192/26	10.18.212.193 – 10.18.212.254	10.18.212.255
85	10.18.213.0/26	10.18.213.1 – 10.18.213.62	10.18.213.63
86	10.18.213.64/26	10.18.213.65 – 10.18.213.126	10.18.213.127
87	10.18.213.128/26	10.18.213.129 – 10.18.213.190	10.18.213.191
88	10.18.213.192/26	10.18.213.193 – 10.18.213.254	10.18.213.255
89	10.18.214.0/26	10.18.214.1 – 10.18.214.62	10.18.214.63
90	10.18.214.64/26	10.18.214.65 – 10.18.214.126	10.18.214.127
91	10.18.214.128/26	10.18.214.129 – 10.18.214.190	10.18.214.191
92	10.18.214.192/26	10.18.214.193 – 10.18.214.254	10.18.214.255
93	10.18.215.0/26	10.18.215.1 – 10.18.215.62	10.18.215.63
94	10.18.215.64/26	10.18.215.65 – 10.18.215.126	10.18.215.127
95	10.18.215.128/26	10.18.215.129 – 10.18.215.190	10.18.215.191
96	10.18.215.192/26	10.18.215.193 – 10.18.215.254	10.18.215.255
97	10.18.216.0/26	10.18.216.1 – 10.18.216.62	10.18.216.63
98	10.18.216.64/26	10.18.216.65 – 10.18.216.126	10.18.216.127
99	10.18.216.128/26	10.18.216.129 – 10.18.216.190	10.18.216.191
100	10.18.216.192/26	10.18.216.193 – 10.18.216.254	10.18.216.255
101	10.18.217.0/26	10.18.217.1 – 10.18.217.62	10.18.217.63
102	10.18.217.64/26	10.18.217.65 – 10.18.217.126	10.18.217.127
103	10.18.217.128/26	10.18.217.129 – 10.18.217.190	10.18.217.191
104	10.18.217.192/26	10.18.217.193 – 10.18.217.254	10.18.217.255
105	10.18.218.0/26	10.18.218.1 – 10.18.218.62	10.18.218.63
106	10.18.218.64/26	10.18.218.65 – 10.18.218.126	10.18.218.127
107	10.18.218.128/26	10.18.218.129 – 10.18.218.190	10.18.218.191
108	10.18.218.192/26	10.18.218.193 – 10.18.218.254	10.18.218.255
109	10.18.219.0/26	10.18.219.1 – 10.18.219.62	10.18.219.63
110	10.18.219.64/26	10.18.219.65 – 10.18.219.126	10.18.219.127
111	10.18.219.128/26	10.18.219.129 – 10.18.219.190	10.18.219.191
112	10.18.219.192/26	10.18.219.193 – 10.18.219.254	10.18.219.255
113	10.18.220.0/26	10.18.220.1 – 10.18.220.62	10.18.220.63
114	10.18.220.64/26	10.18.220.65 – 10.18.220.126	10.18.220.127
115	10.18.220.128/26	10.18.220.129 – 10.18.220.190	10.18.220.191
116	10.18.220.192/26	10.18.220.193 – 10.18.220.254	10.18.220.255
117	10.18.221.0/26	10.18.221.1 – 10.18.221.62	10.18.221.63
118	10.18.221.64/26	10.18.221.65 – 10.18.221.126	10.18.221.127
119	10.18.221.128/26	10.18.221.129 – 10.18.221.190	10.18.221.191
120	10.18.221.192/26	10.18.221.193 – 10.18.221.254	10.18.221.255
121	10.18.222.0/26	10.18.222.1 – 10.18.222.62	10.18.222.63
122	10.18.222.64/26	10.18.222.65 – 10.18.222.126	10.18.222.127
123	10.18.222.128/26	10.18.222.129 – 10.18.222.190	10.18.222.191
124	10.18.222.192/26	10.18.222.193 – 10.18.222.254	10.18.222.255
125	10.18.223.0/26	10.18.223.1 – 10.18.223.62	10.18.223.63
126	10.18.223.64/26	10.18.223.65 – 10.18.223.126	10.18.223.127
127	10.18.223.128/26	10.18.223.129 – 10.18.223.190	10.18.223.191
128	10.18.223.192/26	10.18.223.193 – 10.18.223.254	10.18.223.255

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 →