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)10.9.0.0/18

network10.9.0.0/18

broadcast10.9.63.255

first host10.9.0.1

last host10.9.63.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.9.0.0/18

address00001010.00001001.00000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00001001.00000000.00000000

broadcast00001010.00001001.00111111.11111111

green = network part, grey = host part

hex0x0a090000

decimal168361984

reverse dns0.0.9.10.in-addr.arpa

ipv4-mapped::ffff:a09:0

/18 split into /25 · 128 subnets

close ×

#	network	host range	broadcast
1	10.9.0.0/25	10.9.0.1 – 10.9.0.126	10.9.0.127
2	10.9.0.128/25	10.9.0.129 – 10.9.0.254	10.9.0.255
3	10.9.1.0/25	10.9.1.1 – 10.9.1.126	10.9.1.127
4	10.9.1.128/25	10.9.1.129 – 10.9.1.254	10.9.1.255
5	10.9.2.0/25	10.9.2.1 – 10.9.2.126	10.9.2.127
6	10.9.2.128/25	10.9.2.129 – 10.9.2.254	10.9.2.255
7	10.9.3.0/25	10.9.3.1 – 10.9.3.126	10.9.3.127
8	10.9.3.128/25	10.9.3.129 – 10.9.3.254	10.9.3.255
9	10.9.4.0/25	10.9.4.1 – 10.9.4.126	10.9.4.127
10	10.9.4.128/25	10.9.4.129 – 10.9.4.254	10.9.4.255
11	10.9.5.0/25	10.9.5.1 – 10.9.5.126	10.9.5.127
12	10.9.5.128/25	10.9.5.129 – 10.9.5.254	10.9.5.255
13	10.9.6.0/25	10.9.6.1 – 10.9.6.126	10.9.6.127
14	10.9.6.128/25	10.9.6.129 – 10.9.6.254	10.9.6.255
15	10.9.7.0/25	10.9.7.1 – 10.9.7.126	10.9.7.127
16	10.9.7.128/25	10.9.7.129 – 10.9.7.254	10.9.7.255
17	10.9.8.0/25	10.9.8.1 – 10.9.8.126	10.9.8.127
18	10.9.8.128/25	10.9.8.129 – 10.9.8.254	10.9.8.255
19	10.9.9.0/25	10.9.9.1 – 10.9.9.126	10.9.9.127
20	10.9.9.128/25	10.9.9.129 – 10.9.9.254	10.9.9.255
21	10.9.10.0/25	10.9.10.1 – 10.9.10.126	10.9.10.127
22	10.9.10.128/25	10.9.10.129 – 10.9.10.254	10.9.10.255
23	10.9.11.0/25	10.9.11.1 – 10.9.11.126	10.9.11.127
24	10.9.11.128/25	10.9.11.129 – 10.9.11.254	10.9.11.255
25	10.9.12.0/25	10.9.12.1 – 10.9.12.126	10.9.12.127
26	10.9.12.128/25	10.9.12.129 – 10.9.12.254	10.9.12.255
27	10.9.13.0/25	10.9.13.1 – 10.9.13.126	10.9.13.127
28	10.9.13.128/25	10.9.13.129 – 10.9.13.254	10.9.13.255
29	10.9.14.0/25	10.9.14.1 – 10.9.14.126	10.9.14.127
30	10.9.14.128/25	10.9.14.129 – 10.9.14.254	10.9.14.255
31	10.9.15.0/25	10.9.15.1 – 10.9.15.126	10.9.15.127
32	10.9.15.128/25	10.9.15.129 – 10.9.15.254	10.9.15.255
33	10.9.16.0/25	10.9.16.1 – 10.9.16.126	10.9.16.127
34	10.9.16.128/25	10.9.16.129 – 10.9.16.254	10.9.16.255
35	10.9.17.0/25	10.9.17.1 – 10.9.17.126	10.9.17.127
36	10.9.17.128/25	10.9.17.129 – 10.9.17.254	10.9.17.255
37	10.9.18.0/25	10.9.18.1 – 10.9.18.126	10.9.18.127
38	10.9.18.128/25	10.9.18.129 – 10.9.18.254	10.9.18.255
39	10.9.19.0/25	10.9.19.1 – 10.9.19.126	10.9.19.127
40	10.9.19.128/25	10.9.19.129 – 10.9.19.254	10.9.19.255
41	10.9.20.0/25	10.9.20.1 – 10.9.20.126	10.9.20.127
42	10.9.20.128/25	10.9.20.129 – 10.9.20.254	10.9.20.255
43	10.9.21.0/25	10.9.21.1 – 10.9.21.126	10.9.21.127
44	10.9.21.128/25	10.9.21.129 – 10.9.21.254	10.9.21.255
45	10.9.22.0/25	10.9.22.1 – 10.9.22.126	10.9.22.127
46	10.9.22.128/25	10.9.22.129 – 10.9.22.254	10.9.22.255
47	10.9.23.0/25	10.9.23.1 – 10.9.23.126	10.9.23.127
48	10.9.23.128/25	10.9.23.129 – 10.9.23.254	10.9.23.255
49	10.9.24.0/25	10.9.24.1 – 10.9.24.126	10.9.24.127
50	10.9.24.128/25	10.9.24.129 – 10.9.24.254	10.9.24.255
51	10.9.25.0/25	10.9.25.1 – 10.9.25.126	10.9.25.127
52	10.9.25.128/25	10.9.25.129 – 10.9.25.254	10.9.25.255
53	10.9.26.0/25	10.9.26.1 – 10.9.26.126	10.9.26.127
54	10.9.26.128/25	10.9.26.129 – 10.9.26.254	10.9.26.255
55	10.9.27.0/25	10.9.27.1 – 10.9.27.126	10.9.27.127
56	10.9.27.128/25	10.9.27.129 – 10.9.27.254	10.9.27.255
57	10.9.28.0/25	10.9.28.1 – 10.9.28.126	10.9.28.127
58	10.9.28.128/25	10.9.28.129 – 10.9.28.254	10.9.28.255
59	10.9.29.0/25	10.9.29.1 – 10.9.29.126	10.9.29.127
60	10.9.29.128/25	10.9.29.129 – 10.9.29.254	10.9.29.255
61	10.9.30.0/25	10.9.30.1 – 10.9.30.126	10.9.30.127
62	10.9.30.128/25	10.9.30.129 – 10.9.30.254	10.9.30.255
63	10.9.31.0/25	10.9.31.1 – 10.9.31.126	10.9.31.127
64	10.9.31.128/25	10.9.31.129 – 10.9.31.254	10.9.31.255
65	10.9.32.0/25	10.9.32.1 – 10.9.32.126	10.9.32.127
66	10.9.32.128/25	10.9.32.129 – 10.9.32.254	10.9.32.255
67	10.9.33.0/25	10.9.33.1 – 10.9.33.126	10.9.33.127
68	10.9.33.128/25	10.9.33.129 – 10.9.33.254	10.9.33.255
69	10.9.34.0/25	10.9.34.1 – 10.9.34.126	10.9.34.127
70	10.9.34.128/25	10.9.34.129 – 10.9.34.254	10.9.34.255
71	10.9.35.0/25	10.9.35.1 – 10.9.35.126	10.9.35.127
72	10.9.35.128/25	10.9.35.129 – 10.9.35.254	10.9.35.255
73	10.9.36.0/25	10.9.36.1 – 10.9.36.126	10.9.36.127
74	10.9.36.128/25	10.9.36.129 – 10.9.36.254	10.9.36.255
75	10.9.37.0/25	10.9.37.1 – 10.9.37.126	10.9.37.127
76	10.9.37.128/25	10.9.37.129 – 10.9.37.254	10.9.37.255
77	10.9.38.0/25	10.9.38.1 – 10.9.38.126	10.9.38.127
78	10.9.38.128/25	10.9.38.129 – 10.9.38.254	10.9.38.255
79	10.9.39.0/25	10.9.39.1 – 10.9.39.126	10.9.39.127
80	10.9.39.128/25	10.9.39.129 – 10.9.39.254	10.9.39.255
81	10.9.40.0/25	10.9.40.1 – 10.9.40.126	10.9.40.127
82	10.9.40.128/25	10.9.40.129 – 10.9.40.254	10.9.40.255
83	10.9.41.0/25	10.9.41.1 – 10.9.41.126	10.9.41.127
84	10.9.41.128/25	10.9.41.129 – 10.9.41.254	10.9.41.255
85	10.9.42.0/25	10.9.42.1 – 10.9.42.126	10.9.42.127
86	10.9.42.128/25	10.9.42.129 – 10.9.42.254	10.9.42.255
87	10.9.43.0/25	10.9.43.1 – 10.9.43.126	10.9.43.127
88	10.9.43.128/25	10.9.43.129 – 10.9.43.254	10.9.43.255
89	10.9.44.0/25	10.9.44.1 – 10.9.44.126	10.9.44.127
90	10.9.44.128/25	10.9.44.129 – 10.9.44.254	10.9.44.255
91	10.9.45.0/25	10.9.45.1 – 10.9.45.126	10.9.45.127
92	10.9.45.128/25	10.9.45.129 – 10.9.45.254	10.9.45.255
93	10.9.46.0/25	10.9.46.1 – 10.9.46.126	10.9.46.127
94	10.9.46.128/25	10.9.46.129 – 10.9.46.254	10.9.46.255
95	10.9.47.0/25	10.9.47.1 – 10.9.47.126	10.9.47.127
96	10.9.47.128/25	10.9.47.129 – 10.9.47.254	10.9.47.255
97	10.9.48.0/25	10.9.48.1 – 10.9.48.126	10.9.48.127
98	10.9.48.128/25	10.9.48.129 – 10.9.48.254	10.9.48.255
99	10.9.49.0/25	10.9.49.1 – 10.9.49.126	10.9.49.127
100	10.9.49.128/25	10.9.49.129 – 10.9.49.254	10.9.49.255
101	10.9.50.0/25	10.9.50.1 – 10.9.50.126	10.9.50.127
102	10.9.50.128/25	10.9.50.129 – 10.9.50.254	10.9.50.255
103	10.9.51.0/25	10.9.51.1 – 10.9.51.126	10.9.51.127
104	10.9.51.128/25	10.9.51.129 – 10.9.51.254	10.9.51.255
105	10.9.52.0/25	10.9.52.1 – 10.9.52.126	10.9.52.127
106	10.9.52.128/25	10.9.52.129 – 10.9.52.254	10.9.52.255
107	10.9.53.0/25	10.9.53.1 – 10.9.53.126	10.9.53.127
108	10.9.53.128/25	10.9.53.129 – 10.9.53.254	10.9.53.255
109	10.9.54.0/25	10.9.54.1 – 10.9.54.126	10.9.54.127
110	10.9.54.128/25	10.9.54.129 – 10.9.54.254	10.9.54.255
111	10.9.55.0/25	10.9.55.1 – 10.9.55.126	10.9.55.127
112	10.9.55.128/25	10.9.55.129 – 10.9.55.254	10.9.55.255
113	10.9.56.0/25	10.9.56.1 – 10.9.56.126	10.9.56.127
114	10.9.56.128/25	10.9.56.129 – 10.9.56.254	10.9.56.255
115	10.9.57.0/25	10.9.57.1 – 10.9.57.126	10.9.57.127
116	10.9.57.128/25	10.9.57.129 – 10.9.57.254	10.9.57.255
117	10.9.58.0/25	10.9.58.1 – 10.9.58.126	10.9.58.127
118	10.9.58.128/25	10.9.58.129 – 10.9.58.254	10.9.58.255
119	10.9.59.0/25	10.9.59.1 – 10.9.59.126	10.9.59.127
120	10.9.59.128/25	10.9.59.129 – 10.9.59.254	10.9.59.255
121	10.9.60.0/25	10.9.60.1 – 10.9.60.126	10.9.60.127
122	10.9.60.128/25	10.9.60.129 – 10.9.60.254	10.9.60.255
123	10.9.61.0/25	10.9.61.1 – 10.9.61.126	10.9.61.127
124	10.9.61.128/25	10.9.61.129 – 10.9.61.254	10.9.61.255
125	10.9.62.0/25	10.9.62.1 – 10.9.62.126	10.9.62.127
126	10.9.62.128/25	10.9.62.129 – 10.9.62.254	10.9.62.255
127	10.9.63.0/25	10.9.63.1 – 10.9.63.126	10.9.63.127
128	10.9.63.128/25	10.9.63.129 – 10.9.63.254	10.9.63.255

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →