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)10.2.173.0/25

network10.2.173.0/25

broadcast10.2.173.127

first host10.2.173.1

last host10.2.173.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.173.0/25

address00001010.00000010.10101101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10101101.00000000

broadcast00001010.00000010.10101101.01111111

green = network part, grey = host part

hex0x0a02ad00

decimal167947520

reverse dns0.173.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ad00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.173.0/32	10.2.173.0 – 10.2.173.0	10.2.173.0
2	10.2.173.1/32	10.2.173.1 – 10.2.173.1	10.2.173.1
3	10.2.173.2/32	10.2.173.2 – 10.2.173.2	10.2.173.2
4	10.2.173.3/32	10.2.173.3 – 10.2.173.3	10.2.173.3
5	10.2.173.4/32	10.2.173.4 – 10.2.173.4	10.2.173.4
6	10.2.173.5/32	10.2.173.5 – 10.2.173.5	10.2.173.5
7	10.2.173.6/32	10.2.173.6 – 10.2.173.6	10.2.173.6
8	10.2.173.7/32	10.2.173.7 – 10.2.173.7	10.2.173.7
9	10.2.173.8/32	10.2.173.8 – 10.2.173.8	10.2.173.8
10	10.2.173.9/32	10.2.173.9 – 10.2.173.9	10.2.173.9
11	10.2.173.10/32	10.2.173.10 – 10.2.173.10	10.2.173.10
12	10.2.173.11/32	10.2.173.11 – 10.2.173.11	10.2.173.11
13	10.2.173.12/32	10.2.173.12 – 10.2.173.12	10.2.173.12
14	10.2.173.13/32	10.2.173.13 – 10.2.173.13	10.2.173.13
15	10.2.173.14/32	10.2.173.14 – 10.2.173.14	10.2.173.14
16	10.2.173.15/32	10.2.173.15 – 10.2.173.15	10.2.173.15
17	10.2.173.16/32	10.2.173.16 – 10.2.173.16	10.2.173.16
18	10.2.173.17/32	10.2.173.17 – 10.2.173.17	10.2.173.17
19	10.2.173.18/32	10.2.173.18 – 10.2.173.18	10.2.173.18
20	10.2.173.19/32	10.2.173.19 – 10.2.173.19	10.2.173.19
21	10.2.173.20/32	10.2.173.20 – 10.2.173.20	10.2.173.20
22	10.2.173.21/32	10.2.173.21 – 10.2.173.21	10.2.173.21
23	10.2.173.22/32	10.2.173.22 – 10.2.173.22	10.2.173.22
24	10.2.173.23/32	10.2.173.23 – 10.2.173.23	10.2.173.23
25	10.2.173.24/32	10.2.173.24 – 10.2.173.24	10.2.173.24
26	10.2.173.25/32	10.2.173.25 – 10.2.173.25	10.2.173.25
27	10.2.173.26/32	10.2.173.26 – 10.2.173.26	10.2.173.26
28	10.2.173.27/32	10.2.173.27 – 10.2.173.27	10.2.173.27
29	10.2.173.28/32	10.2.173.28 – 10.2.173.28	10.2.173.28
30	10.2.173.29/32	10.2.173.29 – 10.2.173.29	10.2.173.29
31	10.2.173.30/32	10.2.173.30 – 10.2.173.30	10.2.173.30
32	10.2.173.31/32	10.2.173.31 – 10.2.173.31	10.2.173.31
33	10.2.173.32/32	10.2.173.32 – 10.2.173.32	10.2.173.32
34	10.2.173.33/32	10.2.173.33 – 10.2.173.33	10.2.173.33
35	10.2.173.34/32	10.2.173.34 – 10.2.173.34	10.2.173.34
36	10.2.173.35/32	10.2.173.35 – 10.2.173.35	10.2.173.35
37	10.2.173.36/32	10.2.173.36 – 10.2.173.36	10.2.173.36
38	10.2.173.37/32	10.2.173.37 – 10.2.173.37	10.2.173.37
39	10.2.173.38/32	10.2.173.38 – 10.2.173.38	10.2.173.38
40	10.2.173.39/32	10.2.173.39 – 10.2.173.39	10.2.173.39
41	10.2.173.40/32	10.2.173.40 – 10.2.173.40	10.2.173.40
42	10.2.173.41/32	10.2.173.41 – 10.2.173.41	10.2.173.41
43	10.2.173.42/32	10.2.173.42 – 10.2.173.42	10.2.173.42
44	10.2.173.43/32	10.2.173.43 – 10.2.173.43	10.2.173.43
45	10.2.173.44/32	10.2.173.44 – 10.2.173.44	10.2.173.44
46	10.2.173.45/32	10.2.173.45 – 10.2.173.45	10.2.173.45
47	10.2.173.46/32	10.2.173.46 – 10.2.173.46	10.2.173.46
48	10.2.173.47/32	10.2.173.47 – 10.2.173.47	10.2.173.47
49	10.2.173.48/32	10.2.173.48 – 10.2.173.48	10.2.173.48
50	10.2.173.49/32	10.2.173.49 – 10.2.173.49	10.2.173.49
51	10.2.173.50/32	10.2.173.50 – 10.2.173.50	10.2.173.50
52	10.2.173.51/32	10.2.173.51 – 10.2.173.51	10.2.173.51
53	10.2.173.52/32	10.2.173.52 – 10.2.173.52	10.2.173.52
54	10.2.173.53/32	10.2.173.53 – 10.2.173.53	10.2.173.53
55	10.2.173.54/32	10.2.173.54 – 10.2.173.54	10.2.173.54
56	10.2.173.55/32	10.2.173.55 – 10.2.173.55	10.2.173.55
57	10.2.173.56/32	10.2.173.56 – 10.2.173.56	10.2.173.56
58	10.2.173.57/32	10.2.173.57 – 10.2.173.57	10.2.173.57
59	10.2.173.58/32	10.2.173.58 – 10.2.173.58	10.2.173.58
60	10.2.173.59/32	10.2.173.59 – 10.2.173.59	10.2.173.59
61	10.2.173.60/32	10.2.173.60 – 10.2.173.60	10.2.173.60
62	10.2.173.61/32	10.2.173.61 – 10.2.173.61	10.2.173.61
63	10.2.173.62/32	10.2.173.62 – 10.2.173.62	10.2.173.62
64	10.2.173.63/32	10.2.173.63 – 10.2.173.63	10.2.173.63
65	10.2.173.64/32	10.2.173.64 – 10.2.173.64	10.2.173.64
66	10.2.173.65/32	10.2.173.65 – 10.2.173.65	10.2.173.65
67	10.2.173.66/32	10.2.173.66 – 10.2.173.66	10.2.173.66
68	10.2.173.67/32	10.2.173.67 – 10.2.173.67	10.2.173.67
69	10.2.173.68/32	10.2.173.68 – 10.2.173.68	10.2.173.68
70	10.2.173.69/32	10.2.173.69 – 10.2.173.69	10.2.173.69
71	10.2.173.70/32	10.2.173.70 – 10.2.173.70	10.2.173.70
72	10.2.173.71/32	10.2.173.71 – 10.2.173.71	10.2.173.71
73	10.2.173.72/32	10.2.173.72 – 10.2.173.72	10.2.173.72
74	10.2.173.73/32	10.2.173.73 – 10.2.173.73	10.2.173.73
75	10.2.173.74/32	10.2.173.74 – 10.2.173.74	10.2.173.74
76	10.2.173.75/32	10.2.173.75 – 10.2.173.75	10.2.173.75
77	10.2.173.76/32	10.2.173.76 – 10.2.173.76	10.2.173.76
78	10.2.173.77/32	10.2.173.77 – 10.2.173.77	10.2.173.77
79	10.2.173.78/32	10.2.173.78 – 10.2.173.78	10.2.173.78
80	10.2.173.79/32	10.2.173.79 – 10.2.173.79	10.2.173.79
81	10.2.173.80/32	10.2.173.80 – 10.2.173.80	10.2.173.80
82	10.2.173.81/32	10.2.173.81 – 10.2.173.81	10.2.173.81
83	10.2.173.82/32	10.2.173.82 – 10.2.173.82	10.2.173.82
84	10.2.173.83/32	10.2.173.83 – 10.2.173.83	10.2.173.83
85	10.2.173.84/32	10.2.173.84 – 10.2.173.84	10.2.173.84
86	10.2.173.85/32	10.2.173.85 – 10.2.173.85	10.2.173.85
87	10.2.173.86/32	10.2.173.86 – 10.2.173.86	10.2.173.86
88	10.2.173.87/32	10.2.173.87 – 10.2.173.87	10.2.173.87
89	10.2.173.88/32	10.2.173.88 – 10.2.173.88	10.2.173.88
90	10.2.173.89/32	10.2.173.89 – 10.2.173.89	10.2.173.89
91	10.2.173.90/32	10.2.173.90 – 10.2.173.90	10.2.173.90
92	10.2.173.91/32	10.2.173.91 – 10.2.173.91	10.2.173.91
93	10.2.173.92/32	10.2.173.92 – 10.2.173.92	10.2.173.92
94	10.2.173.93/32	10.2.173.93 – 10.2.173.93	10.2.173.93
95	10.2.173.94/32	10.2.173.94 – 10.2.173.94	10.2.173.94
96	10.2.173.95/32	10.2.173.95 – 10.2.173.95	10.2.173.95
97	10.2.173.96/32	10.2.173.96 – 10.2.173.96	10.2.173.96
98	10.2.173.97/32	10.2.173.97 – 10.2.173.97	10.2.173.97
99	10.2.173.98/32	10.2.173.98 – 10.2.173.98	10.2.173.98
100	10.2.173.99/32	10.2.173.99 – 10.2.173.99	10.2.173.99
101	10.2.173.100/32	10.2.173.100 – 10.2.173.100	10.2.173.100
102	10.2.173.101/32	10.2.173.101 – 10.2.173.101	10.2.173.101
103	10.2.173.102/32	10.2.173.102 – 10.2.173.102	10.2.173.102
104	10.2.173.103/32	10.2.173.103 – 10.2.173.103	10.2.173.103
105	10.2.173.104/32	10.2.173.104 – 10.2.173.104	10.2.173.104
106	10.2.173.105/32	10.2.173.105 – 10.2.173.105	10.2.173.105
107	10.2.173.106/32	10.2.173.106 – 10.2.173.106	10.2.173.106
108	10.2.173.107/32	10.2.173.107 – 10.2.173.107	10.2.173.107
109	10.2.173.108/32	10.2.173.108 – 10.2.173.108	10.2.173.108
110	10.2.173.109/32	10.2.173.109 – 10.2.173.109	10.2.173.109
111	10.2.173.110/32	10.2.173.110 – 10.2.173.110	10.2.173.110
112	10.2.173.111/32	10.2.173.111 – 10.2.173.111	10.2.173.111
113	10.2.173.112/32	10.2.173.112 – 10.2.173.112	10.2.173.112
114	10.2.173.113/32	10.2.173.113 – 10.2.173.113	10.2.173.113
115	10.2.173.114/32	10.2.173.114 – 10.2.173.114	10.2.173.114
116	10.2.173.115/32	10.2.173.115 – 10.2.173.115	10.2.173.115
117	10.2.173.116/32	10.2.173.116 – 10.2.173.116	10.2.173.116
118	10.2.173.117/32	10.2.173.117 – 10.2.173.117	10.2.173.117
119	10.2.173.118/32	10.2.173.118 – 10.2.173.118	10.2.173.118
120	10.2.173.119/32	10.2.173.119 – 10.2.173.119	10.2.173.119
121	10.2.173.120/32	10.2.173.120 – 10.2.173.120	10.2.173.120
122	10.2.173.121/32	10.2.173.121 – 10.2.173.121	10.2.173.121
123	10.2.173.122/32	10.2.173.122 – 10.2.173.122	10.2.173.122
124	10.2.173.123/32	10.2.173.123 – 10.2.173.123	10.2.173.123
125	10.2.173.124/32	10.2.173.124 – 10.2.173.124	10.2.173.124
126	10.2.173.125/32	10.2.173.125 – 10.2.173.125	10.2.173.125
127	10.2.173.126/32	10.2.173.126 – 10.2.173.126	10.2.173.126
128	10.2.173.127/32	10.2.173.127 – 10.2.173.127	10.2.173.127

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