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)10.9.0.0/17

network10.9.0.0/17

broadcast10.9.127.255

first host10.9.0.1

last host10.9.127.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.9.0.0/17

address00001010.00001001.00000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.00001001.00000000.00000000

broadcast00001010.00001001.01111111.11111111

green = network part, grey = host part

hex0x0a090000

decimal168361984

reverse dns0.0.9.10.in-addr.arpa

ipv4-mapped::ffff:a09:0

/17 split into /24 · 128 subnets

close ×

#	network	host range	broadcast
1	10.9.0.0/24	10.9.0.1 – 10.9.0.254	10.9.0.255
2	10.9.1.0/24	10.9.1.1 – 10.9.1.254	10.9.1.255
3	10.9.2.0/24	10.9.2.1 – 10.9.2.254	10.9.2.255
4	10.9.3.0/24	10.9.3.1 – 10.9.3.254	10.9.3.255
5	10.9.4.0/24	10.9.4.1 – 10.9.4.254	10.9.4.255
6	10.9.5.0/24	10.9.5.1 – 10.9.5.254	10.9.5.255
7	10.9.6.0/24	10.9.6.1 – 10.9.6.254	10.9.6.255
8	10.9.7.0/24	10.9.7.1 – 10.9.7.254	10.9.7.255
9	10.9.8.0/24	10.9.8.1 – 10.9.8.254	10.9.8.255
10	10.9.9.0/24	10.9.9.1 – 10.9.9.254	10.9.9.255
11	10.9.10.0/24	10.9.10.1 – 10.9.10.254	10.9.10.255
12	10.9.11.0/24	10.9.11.1 – 10.9.11.254	10.9.11.255
13	10.9.12.0/24	10.9.12.1 – 10.9.12.254	10.9.12.255
14	10.9.13.0/24	10.9.13.1 – 10.9.13.254	10.9.13.255
15	10.9.14.0/24	10.9.14.1 – 10.9.14.254	10.9.14.255
16	10.9.15.0/24	10.9.15.1 – 10.9.15.254	10.9.15.255
17	10.9.16.0/24	10.9.16.1 – 10.9.16.254	10.9.16.255
18	10.9.17.0/24	10.9.17.1 – 10.9.17.254	10.9.17.255
19	10.9.18.0/24	10.9.18.1 – 10.9.18.254	10.9.18.255
20	10.9.19.0/24	10.9.19.1 – 10.9.19.254	10.9.19.255
21	10.9.20.0/24	10.9.20.1 – 10.9.20.254	10.9.20.255
22	10.9.21.0/24	10.9.21.1 – 10.9.21.254	10.9.21.255
23	10.9.22.0/24	10.9.22.1 – 10.9.22.254	10.9.22.255
24	10.9.23.0/24	10.9.23.1 – 10.9.23.254	10.9.23.255
25	10.9.24.0/24	10.9.24.1 – 10.9.24.254	10.9.24.255
26	10.9.25.0/24	10.9.25.1 – 10.9.25.254	10.9.25.255
27	10.9.26.0/24	10.9.26.1 – 10.9.26.254	10.9.26.255
28	10.9.27.0/24	10.9.27.1 – 10.9.27.254	10.9.27.255
29	10.9.28.0/24	10.9.28.1 – 10.9.28.254	10.9.28.255
30	10.9.29.0/24	10.9.29.1 – 10.9.29.254	10.9.29.255
31	10.9.30.0/24	10.9.30.1 – 10.9.30.254	10.9.30.255
32	10.9.31.0/24	10.9.31.1 – 10.9.31.254	10.9.31.255
33	10.9.32.0/24	10.9.32.1 – 10.9.32.254	10.9.32.255
34	10.9.33.0/24	10.9.33.1 – 10.9.33.254	10.9.33.255
35	10.9.34.0/24	10.9.34.1 – 10.9.34.254	10.9.34.255
36	10.9.35.0/24	10.9.35.1 – 10.9.35.254	10.9.35.255
37	10.9.36.0/24	10.9.36.1 – 10.9.36.254	10.9.36.255
38	10.9.37.0/24	10.9.37.1 – 10.9.37.254	10.9.37.255
39	10.9.38.0/24	10.9.38.1 – 10.9.38.254	10.9.38.255
40	10.9.39.0/24	10.9.39.1 – 10.9.39.254	10.9.39.255
41	10.9.40.0/24	10.9.40.1 – 10.9.40.254	10.9.40.255
42	10.9.41.0/24	10.9.41.1 – 10.9.41.254	10.9.41.255
43	10.9.42.0/24	10.9.42.1 – 10.9.42.254	10.9.42.255
44	10.9.43.0/24	10.9.43.1 – 10.9.43.254	10.9.43.255
45	10.9.44.0/24	10.9.44.1 – 10.9.44.254	10.9.44.255
46	10.9.45.0/24	10.9.45.1 – 10.9.45.254	10.9.45.255
47	10.9.46.0/24	10.9.46.1 – 10.9.46.254	10.9.46.255
48	10.9.47.0/24	10.9.47.1 – 10.9.47.254	10.9.47.255
49	10.9.48.0/24	10.9.48.1 – 10.9.48.254	10.9.48.255
50	10.9.49.0/24	10.9.49.1 – 10.9.49.254	10.9.49.255
51	10.9.50.0/24	10.9.50.1 – 10.9.50.254	10.9.50.255
52	10.9.51.0/24	10.9.51.1 – 10.9.51.254	10.9.51.255
53	10.9.52.0/24	10.9.52.1 – 10.9.52.254	10.9.52.255
54	10.9.53.0/24	10.9.53.1 – 10.9.53.254	10.9.53.255
55	10.9.54.0/24	10.9.54.1 – 10.9.54.254	10.9.54.255
56	10.9.55.0/24	10.9.55.1 – 10.9.55.254	10.9.55.255
57	10.9.56.0/24	10.9.56.1 – 10.9.56.254	10.9.56.255
58	10.9.57.0/24	10.9.57.1 – 10.9.57.254	10.9.57.255
59	10.9.58.0/24	10.9.58.1 – 10.9.58.254	10.9.58.255
60	10.9.59.0/24	10.9.59.1 – 10.9.59.254	10.9.59.255
61	10.9.60.0/24	10.9.60.1 – 10.9.60.254	10.9.60.255
62	10.9.61.0/24	10.9.61.1 – 10.9.61.254	10.9.61.255
63	10.9.62.0/24	10.9.62.1 – 10.9.62.254	10.9.62.255
64	10.9.63.0/24	10.9.63.1 – 10.9.63.254	10.9.63.255
65	10.9.64.0/24	10.9.64.1 – 10.9.64.254	10.9.64.255
66	10.9.65.0/24	10.9.65.1 – 10.9.65.254	10.9.65.255
67	10.9.66.0/24	10.9.66.1 – 10.9.66.254	10.9.66.255
68	10.9.67.0/24	10.9.67.1 – 10.9.67.254	10.9.67.255
69	10.9.68.0/24	10.9.68.1 – 10.9.68.254	10.9.68.255
70	10.9.69.0/24	10.9.69.1 – 10.9.69.254	10.9.69.255
71	10.9.70.0/24	10.9.70.1 – 10.9.70.254	10.9.70.255
72	10.9.71.0/24	10.9.71.1 – 10.9.71.254	10.9.71.255
73	10.9.72.0/24	10.9.72.1 – 10.9.72.254	10.9.72.255
74	10.9.73.0/24	10.9.73.1 – 10.9.73.254	10.9.73.255
75	10.9.74.0/24	10.9.74.1 – 10.9.74.254	10.9.74.255
76	10.9.75.0/24	10.9.75.1 – 10.9.75.254	10.9.75.255
77	10.9.76.0/24	10.9.76.1 – 10.9.76.254	10.9.76.255
78	10.9.77.0/24	10.9.77.1 – 10.9.77.254	10.9.77.255
79	10.9.78.0/24	10.9.78.1 – 10.9.78.254	10.9.78.255
80	10.9.79.0/24	10.9.79.1 – 10.9.79.254	10.9.79.255
81	10.9.80.0/24	10.9.80.1 – 10.9.80.254	10.9.80.255
82	10.9.81.0/24	10.9.81.1 – 10.9.81.254	10.9.81.255
83	10.9.82.0/24	10.9.82.1 – 10.9.82.254	10.9.82.255
84	10.9.83.0/24	10.9.83.1 – 10.9.83.254	10.9.83.255
85	10.9.84.0/24	10.9.84.1 – 10.9.84.254	10.9.84.255
86	10.9.85.0/24	10.9.85.1 – 10.9.85.254	10.9.85.255
87	10.9.86.0/24	10.9.86.1 – 10.9.86.254	10.9.86.255
88	10.9.87.0/24	10.9.87.1 – 10.9.87.254	10.9.87.255
89	10.9.88.0/24	10.9.88.1 – 10.9.88.254	10.9.88.255
90	10.9.89.0/24	10.9.89.1 – 10.9.89.254	10.9.89.255
91	10.9.90.0/24	10.9.90.1 – 10.9.90.254	10.9.90.255
92	10.9.91.0/24	10.9.91.1 – 10.9.91.254	10.9.91.255
93	10.9.92.0/24	10.9.92.1 – 10.9.92.254	10.9.92.255
94	10.9.93.0/24	10.9.93.1 – 10.9.93.254	10.9.93.255
95	10.9.94.0/24	10.9.94.1 – 10.9.94.254	10.9.94.255
96	10.9.95.0/24	10.9.95.1 – 10.9.95.254	10.9.95.255
97	10.9.96.0/24	10.9.96.1 – 10.9.96.254	10.9.96.255
98	10.9.97.0/24	10.9.97.1 – 10.9.97.254	10.9.97.255
99	10.9.98.0/24	10.9.98.1 – 10.9.98.254	10.9.98.255
100	10.9.99.0/24	10.9.99.1 – 10.9.99.254	10.9.99.255
101	10.9.100.0/24	10.9.100.1 – 10.9.100.254	10.9.100.255
102	10.9.101.0/24	10.9.101.1 – 10.9.101.254	10.9.101.255
103	10.9.102.0/24	10.9.102.1 – 10.9.102.254	10.9.102.255
104	10.9.103.0/24	10.9.103.1 – 10.9.103.254	10.9.103.255
105	10.9.104.0/24	10.9.104.1 – 10.9.104.254	10.9.104.255
106	10.9.105.0/24	10.9.105.1 – 10.9.105.254	10.9.105.255
107	10.9.106.0/24	10.9.106.1 – 10.9.106.254	10.9.106.255
108	10.9.107.0/24	10.9.107.1 – 10.9.107.254	10.9.107.255
109	10.9.108.0/24	10.9.108.1 – 10.9.108.254	10.9.108.255
110	10.9.109.0/24	10.9.109.1 – 10.9.109.254	10.9.109.255
111	10.9.110.0/24	10.9.110.1 – 10.9.110.254	10.9.110.255
112	10.9.111.0/24	10.9.111.1 – 10.9.111.254	10.9.111.255
113	10.9.112.0/24	10.9.112.1 – 10.9.112.254	10.9.112.255
114	10.9.113.0/24	10.9.113.1 – 10.9.113.254	10.9.113.255
115	10.9.114.0/24	10.9.114.1 – 10.9.114.254	10.9.114.255
116	10.9.115.0/24	10.9.115.1 – 10.9.115.254	10.9.115.255
117	10.9.116.0/24	10.9.116.1 – 10.9.116.254	10.9.116.255
118	10.9.117.0/24	10.9.117.1 – 10.9.117.254	10.9.117.255
119	10.9.118.0/24	10.9.118.1 – 10.9.118.254	10.9.118.255
120	10.9.119.0/24	10.9.119.1 – 10.9.119.254	10.9.119.255
121	10.9.120.0/24	10.9.120.1 – 10.9.120.254	10.9.120.255
122	10.9.121.0/24	10.9.121.1 – 10.9.121.254	10.9.121.255
123	10.9.122.0/24	10.9.122.1 – 10.9.122.254	10.9.122.255
124	10.9.123.0/24	10.9.123.1 – 10.9.123.254	10.9.123.255
125	10.9.124.0/24	10.9.124.1 – 10.9.124.254	10.9.124.255
126	10.9.125.0/24	10.9.125.1 – 10.9.125.254	10.9.125.255
127	10.9.126.0/24	10.9.126.1 – 10.9.126.254	10.9.126.255
128	10.9.127.0/24	10.9.127.1 – 10.9.127.254	10.9.127.255

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 /17
/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	1
/18	255.255.192.0	16,384	16,382	2 split →
/19	255.255.224.0	8,192	8,190	4 split →
/20	255.255.240.0	4,096	4,094	8 split →
/21	255.255.248.0	2,048	2,046	16 split →
/22	255.255.252.0	1,024	1,022	32 split →
/23	255.255.254.0	512	510	64 split →
/24	255.255.255.0	256	254	128 split →
/25	255.255.255.128	128	126	256 split →
/26	255.255.255.192	64	62	512 split →
/27	255.255.255.224	32	30	1,024 split →
/28	255.255.255.240	16	14	2,048 split →
/29	255.255.255.248	8	6	4,096 split →
/30	255.255.255.252	4	2	8,192 split →
/31	255.255.255.254	2	2	16,384 split →
/32	255.255.255.255	1	1	32,768 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 →