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)10.0.49.0/25

network10.0.49.0/25

broadcast10.0.49.127

first host10.0.49.1

last host10.0.49.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.49.0/25

address00001010.00000000.00110001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00110001.00000000

broadcast00001010.00000000.00110001.01111111

green = network part, grey = host part

hex0x0a003100

decimal167784704

reverse dns0.49.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:3100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.49.0/32	10.0.49.0 – 10.0.49.0	10.0.49.0
2	10.0.49.1/32	10.0.49.1 – 10.0.49.1	10.0.49.1
3	10.0.49.2/32	10.0.49.2 – 10.0.49.2	10.0.49.2
4	10.0.49.3/32	10.0.49.3 – 10.0.49.3	10.0.49.3
5	10.0.49.4/32	10.0.49.4 – 10.0.49.4	10.0.49.4
6	10.0.49.5/32	10.0.49.5 – 10.0.49.5	10.0.49.5
7	10.0.49.6/32	10.0.49.6 – 10.0.49.6	10.0.49.6
8	10.0.49.7/32	10.0.49.7 – 10.0.49.7	10.0.49.7
9	10.0.49.8/32	10.0.49.8 – 10.0.49.8	10.0.49.8
10	10.0.49.9/32	10.0.49.9 – 10.0.49.9	10.0.49.9
11	10.0.49.10/32	10.0.49.10 – 10.0.49.10	10.0.49.10
12	10.0.49.11/32	10.0.49.11 – 10.0.49.11	10.0.49.11
13	10.0.49.12/32	10.0.49.12 – 10.0.49.12	10.0.49.12
14	10.0.49.13/32	10.0.49.13 – 10.0.49.13	10.0.49.13
15	10.0.49.14/32	10.0.49.14 – 10.0.49.14	10.0.49.14
16	10.0.49.15/32	10.0.49.15 – 10.0.49.15	10.0.49.15
17	10.0.49.16/32	10.0.49.16 – 10.0.49.16	10.0.49.16
18	10.0.49.17/32	10.0.49.17 – 10.0.49.17	10.0.49.17
19	10.0.49.18/32	10.0.49.18 – 10.0.49.18	10.0.49.18
20	10.0.49.19/32	10.0.49.19 – 10.0.49.19	10.0.49.19
21	10.0.49.20/32	10.0.49.20 – 10.0.49.20	10.0.49.20
22	10.0.49.21/32	10.0.49.21 – 10.0.49.21	10.0.49.21
23	10.0.49.22/32	10.0.49.22 – 10.0.49.22	10.0.49.22
24	10.0.49.23/32	10.0.49.23 – 10.0.49.23	10.0.49.23
25	10.0.49.24/32	10.0.49.24 – 10.0.49.24	10.0.49.24
26	10.0.49.25/32	10.0.49.25 – 10.0.49.25	10.0.49.25
27	10.0.49.26/32	10.0.49.26 – 10.0.49.26	10.0.49.26
28	10.0.49.27/32	10.0.49.27 – 10.0.49.27	10.0.49.27
29	10.0.49.28/32	10.0.49.28 – 10.0.49.28	10.0.49.28
30	10.0.49.29/32	10.0.49.29 – 10.0.49.29	10.0.49.29
31	10.0.49.30/32	10.0.49.30 – 10.0.49.30	10.0.49.30
32	10.0.49.31/32	10.0.49.31 – 10.0.49.31	10.0.49.31
33	10.0.49.32/32	10.0.49.32 – 10.0.49.32	10.0.49.32
34	10.0.49.33/32	10.0.49.33 – 10.0.49.33	10.0.49.33
35	10.0.49.34/32	10.0.49.34 – 10.0.49.34	10.0.49.34
36	10.0.49.35/32	10.0.49.35 – 10.0.49.35	10.0.49.35
37	10.0.49.36/32	10.0.49.36 – 10.0.49.36	10.0.49.36
38	10.0.49.37/32	10.0.49.37 – 10.0.49.37	10.0.49.37
39	10.0.49.38/32	10.0.49.38 – 10.0.49.38	10.0.49.38
40	10.0.49.39/32	10.0.49.39 – 10.0.49.39	10.0.49.39
41	10.0.49.40/32	10.0.49.40 – 10.0.49.40	10.0.49.40
42	10.0.49.41/32	10.0.49.41 – 10.0.49.41	10.0.49.41
43	10.0.49.42/32	10.0.49.42 – 10.0.49.42	10.0.49.42
44	10.0.49.43/32	10.0.49.43 – 10.0.49.43	10.0.49.43
45	10.0.49.44/32	10.0.49.44 – 10.0.49.44	10.0.49.44
46	10.0.49.45/32	10.0.49.45 – 10.0.49.45	10.0.49.45
47	10.0.49.46/32	10.0.49.46 – 10.0.49.46	10.0.49.46
48	10.0.49.47/32	10.0.49.47 – 10.0.49.47	10.0.49.47
49	10.0.49.48/32	10.0.49.48 – 10.0.49.48	10.0.49.48
50	10.0.49.49/32	10.0.49.49 – 10.0.49.49	10.0.49.49
51	10.0.49.50/32	10.0.49.50 – 10.0.49.50	10.0.49.50
52	10.0.49.51/32	10.0.49.51 – 10.0.49.51	10.0.49.51
53	10.0.49.52/32	10.0.49.52 – 10.0.49.52	10.0.49.52
54	10.0.49.53/32	10.0.49.53 – 10.0.49.53	10.0.49.53
55	10.0.49.54/32	10.0.49.54 – 10.0.49.54	10.0.49.54
56	10.0.49.55/32	10.0.49.55 – 10.0.49.55	10.0.49.55
57	10.0.49.56/32	10.0.49.56 – 10.0.49.56	10.0.49.56
58	10.0.49.57/32	10.0.49.57 – 10.0.49.57	10.0.49.57
59	10.0.49.58/32	10.0.49.58 – 10.0.49.58	10.0.49.58
60	10.0.49.59/32	10.0.49.59 – 10.0.49.59	10.0.49.59
61	10.0.49.60/32	10.0.49.60 – 10.0.49.60	10.0.49.60
62	10.0.49.61/32	10.0.49.61 – 10.0.49.61	10.0.49.61
63	10.0.49.62/32	10.0.49.62 – 10.0.49.62	10.0.49.62
64	10.0.49.63/32	10.0.49.63 – 10.0.49.63	10.0.49.63
65	10.0.49.64/32	10.0.49.64 – 10.0.49.64	10.0.49.64
66	10.0.49.65/32	10.0.49.65 – 10.0.49.65	10.0.49.65
67	10.0.49.66/32	10.0.49.66 – 10.0.49.66	10.0.49.66
68	10.0.49.67/32	10.0.49.67 – 10.0.49.67	10.0.49.67
69	10.0.49.68/32	10.0.49.68 – 10.0.49.68	10.0.49.68
70	10.0.49.69/32	10.0.49.69 – 10.0.49.69	10.0.49.69
71	10.0.49.70/32	10.0.49.70 – 10.0.49.70	10.0.49.70
72	10.0.49.71/32	10.0.49.71 – 10.0.49.71	10.0.49.71
73	10.0.49.72/32	10.0.49.72 – 10.0.49.72	10.0.49.72
74	10.0.49.73/32	10.0.49.73 – 10.0.49.73	10.0.49.73
75	10.0.49.74/32	10.0.49.74 – 10.0.49.74	10.0.49.74
76	10.0.49.75/32	10.0.49.75 – 10.0.49.75	10.0.49.75
77	10.0.49.76/32	10.0.49.76 – 10.0.49.76	10.0.49.76
78	10.0.49.77/32	10.0.49.77 – 10.0.49.77	10.0.49.77
79	10.0.49.78/32	10.0.49.78 – 10.0.49.78	10.0.49.78
80	10.0.49.79/32	10.0.49.79 – 10.0.49.79	10.0.49.79
81	10.0.49.80/32	10.0.49.80 – 10.0.49.80	10.0.49.80
82	10.0.49.81/32	10.0.49.81 – 10.0.49.81	10.0.49.81
83	10.0.49.82/32	10.0.49.82 – 10.0.49.82	10.0.49.82
84	10.0.49.83/32	10.0.49.83 – 10.0.49.83	10.0.49.83
85	10.0.49.84/32	10.0.49.84 – 10.0.49.84	10.0.49.84
86	10.0.49.85/32	10.0.49.85 – 10.0.49.85	10.0.49.85
87	10.0.49.86/32	10.0.49.86 – 10.0.49.86	10.0.49.86
88	10.0.49.87/32	10.0.49.87 – 10.0.49.87	10.0.49.87
89	10.0.49.88/32	10.0.49.88 – 10.0.49.88	10.0.49.88
90	10.0.49.89/32	10.0.49.89 – 10.0.49.89	10.0.49.89
91	10.0.49.90/32	10.0.49.90 – 10.0.49.90	10.0.49.90
92	10.0.49.91/32	10.0.49.91 – 10.0.49.91	10.0.49.91
93	10.0.49.92/32	10.0.49.92 – 10.0.49.92	10.0.49.92
94	10.0.49.93/32	10.0.49.93 – 10.0.49.93	10.0.49.93
95	10.0.49.94/32	10.0.49.94 – 10.0.49.94	10.0.49.94
96	10.0.49.95/32	10.0.49.95 – 10.0.49.95	10.0.49.95
97	10.0.49.96/32	10.0.49.96 – 10.0.49.96	10.0.49.96
98	10.0.49.97/32	10.0.49.97 – 10.0.49.97	10.0.49.97
99	10.0.49.98/32	10.0.49.98 – 10.0.49.98	10.0.49.98
100	10.0.49.99/32	10.0.49.99 – 10.0.49.99	10.0.49.99
101	10.0.49.100/32	10.0.49.100 – 10.0.49.100	10.0.49.100
102	10.0.49.101/32	10.0.49.101 – 10.0.49.101	10.0.49.101
103	10.0.49.102/32	10.0.49.102 – 10.0.49.102	10.0.49.102
104	10.0.49.103/32	10.0.49.103 – 10.0.49.103	10.0.49.103
105	10.0.49.104/32	10.0.49.104 – 10.0.49.104	10.0.49.104
106	10.0.49.105/32	10.0.49.105 – 10.0.49.105	10.0.49.105
107	10.0.49.106/32	10.0.49.106 – 10.0.49.106	10.0.49.106
108	10.0.49.107/32	10.0.49.107 – 10.0.49.107	10.0.49.107
109	10.0.49.108/32	10.0.49.108 – 10.0.49.108	10.0.49.108
110	10.0.49.109/32	10.0.49.109 – 10.0.49.109	10.0.49.109
111	10.0.49.110/32	10.0.49.110 – 10.0.49.110	10.0.49.110
112	10.0.49.111/32	10.0.49.111 – 10.0.49.111	10.0.49.111
113	10.0.49.112/32	10.0.49.112 – 10.0.49.112	10.0.49.112
114	10.0.49.113/32	10.0.49.113 – 10.0.49.113	10.0.49.113
115	10.0.49.114/32	10.0.49.114 – 10.0.49.114	10.0.49.114
116	10.0.49.115/32	10.0.49.115 – 10.0.49.115	10.0.49.115
117	10.0.49.116/32	10.0.49.116 – 10.0.49.116	10.0.49.116
118	10.0.49.117/32	10.0.49.117 – 10.0.49.117	10.0.49.117
119	10.0.49.118/32	10.0.49.118 – 10.0.49.118	10.0.49.118
120	10.0.49.119/32	10.0.49.119 – 10.0.49.119	10.0.49.119
121	10.0.49.120/32	10.0.49.120 – 10.0.49.120	10.0.49.120
122	10.0.49.121/32	10.0.49.121 – 10.0.49.121	10.0.49.121
123	10.0.49.122/32	10.0.49.122 – 10.0.49.122	10.0.49.122
124	10.0.49.123/32	10.0.49.123 – 10.0.49.123	10.0.49.123
125	10.0.49.124/32	10.0.49.124 – 10.0.49.124	10.0.49.124
126	10.0.49.125/32	10.0.49.125 – 10.0.49.125	10.0.49.125
127	10.0.49.126/32	10.0.49.126 – 10.0.49.126	10.0.49.126
128	10.0.49.127/32	10.0.49.127 – 10.0.49.127	10.0.49.127

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 →