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Why isn't 10.0.0.0/8 used instead of 192.168.0.0/16 for private addresses?

How does NAT work for large private networks?Are private IP addresses unique?Optimal IP range for private LAN networkWhy are there 3 ranges of private IPv4 addresses?Why do LANs use MAC addressing instead of IP addressing?Block private addresses for Egress traffic passing through an ASA firewall performing NAT translationPort numbers and private IP addresses in Port Address TranslationWere private IP ranges used publicly before inception of NAT?Why to use public IP addresses within private networks?How does this NAT translate the same public address to different private addresses, without using ports?

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1

RFC 1918 “Address Allocation for Private Internets” (https://tools.ietf.org/html/rfc1918) specifies 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as private addresses suitable for unrestricted private internal use. Many home networks use the
192.168.1.0/24 address space.

Since 10.0.0.0/8 is a larger address space than 192.168.0.0/16, it would make sense to use 10.0.0.0/8 since there can be more IPs per network.

Why isn't 10.0.0.0/8 commonly used instead?

nat lan rfc

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asked 11 hours ago

lmaooooolmaooooo

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• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  It is commonly used. It’s s mistake to think it isn’t.
  
  – Ron Trunk
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Various 192.168.0.0/16 addresses are allocated by default on many domestic routers, which is why many domestic networks use them. 10.0.0.0/8 and 172.16.0.0/12 are in fact extremely common and used all over the place. It's just whatever the network designer chooses, for good reasons or poor reasons.
  
  – jonathanjo
  9 hours ago
  

  
  
  
  

add a comment | 

1

RFC 1918 “Address Allocation for Private Internets” (https://tools.ietf.org/html/rfc1918) specifies 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as private addresses suitable for unrestricted private internal use. Many home networks use the
192.168.1.0/24 address space.

Since 10.0.0.0/8 is a larger address space than 192.168.0.0/16, it would make sense to use 10.0.0.0/8 since there can be more IPs per network.

Why isn't 10.0.0.0/8 commonly used instead?

nat lan rfc

share|improve this question

asked 11 hours ago

lmaooooolmaooooo

11211 bronze badge

New contributor

lmaooooo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  It is commonly used. It’s s mistake to think it isn’t.
  
  – Ron Trunk
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Various 192.168.0.0/16 addresses are allocated by default on many domestic routers, which is why many domestic networks use them. 10.0.0.0/8 and 172.16.0.0/12 are in fact extremely common and used all over the place. It's just whatever the network designer chooses, for good reasons or poor reasons.
  
  – jonathanjo
  9 hours ago
  

  
  
  
  

add a comment | 

RFC 1918 “Address Allocation for Private Internets” (https://tools.ietf.org/html/rfc1918) specifies 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as private addresses suitable for unrestricted private internal use. Many home networks use the
192.168.1.0/24 address space.

Since 10.0.0.0/8 is a larger address space than 192.168.0.0/16, it would make sense to use 10.0.0.0/8 since there can be more IPs per network.

Why isn't 10.0.0.0/8 commonly used instead?

nat lan rfc

share|improve this question

asked 11 hours ago

lmaooooolmaooooo

11211 bronze badge

New contributor

lmaooooo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 11 hours ago

lmaooooolmaooooo

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lmaooooo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 11 hours ago

lmaooooolmaooooo

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asked 11 hours ago

lmaooooolmaooooo

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asked 11 hours ago

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2 Answers
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3

It is merely a necessity constraint and personal preference.

If a Network is being built that would only have 10, or 20, or 50, or even 100 hosts, there is no reason not to use a /24 from 192.168.0.0/16. This is why home networks typically use the 192.168.0.0 range.

If a Network is being built that would (in all growth projections) only have up to 1000 or 2000 users, then picking a few /20's in the 172.16.0.0/12 range is perfectly reasonable.

If a Network is being built that would (in all growth projections) possibly exceed that, then the 10.0.0.0 IP space is ideal.

That said, there are no rules or regulations. Anyone is free to use the 10.0.0.0 range or the 192.168.0.0 range for whatever network(s) they want.

As an analogy... you can kill a fly with a flyswatter or a sledgehammer. But one of those is much simpler to handle, and just as effective.

share|improve this answer

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

• 
  
  
  

  
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  You can even use all of the RFC1918 ranges together at the same time. ;-)
  
  – Zac67
  9 hours ago
  

  
  
  
  

add a comment | 

1

As Eddie has very well explained, there's not much difference in which range you use.

One tiny difference there is though: since 192.168.0.0/16 is allocated from the former C-class range 192.0.0.0/3 many systems default the network mask to 255.255.255.0 or /24. Those same systems default a 172.16.0.0/12 subnet to B-class, /16, and and 10.0.0.0/8 subnet to /8. So, the use of a /24 may come more "natural" with 192.168.x.y.

In our company we use 172.16.0.0/12 for historical reasons, with /24 subnets. When setting up something new I very often have to adjust the default /16 mask to /24. As it seems, classful networking isn't quite dead yet - but it should be.

share|improve this answer

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I would say in my experience, businesses/corporations tend to make more use of 10.0.0.0/8 and 172.16.0.0/12 more often than 192.168.0.0/16. Making consumer devices that use 192.168.0.0/16 for home devices makes sense as it helps to avoid any sort of IP space "overlap" when using features such as VPN.
  
  – YLearn♦
  6 hours ago
  

  
  
  
  

add a comment | 

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3

It is merely a necessity constraint and personal preference.

If a Network is being built that would only have 10, or 20, or 50, or even 100 hosts, there is no reason not to use a /24 from 192.168.0.0/16. This is why home networks typically use the 192.168.0.0 range.

If a Network is being built that would (in all growth projections) only have up to 1000 or 2000 users, then picking a few /20's in the 172.16.0.0/12 range is perfectly reasonable.

If a Network is being built that would (in all growth projections) possibly exceed that, then the 10.0.0.0 IP space is ideal.

That said, there are no rules or regulations. Anyone is free to use the 10.0.0.0 range or the 192.168.0.0 range for whatever network(s) they want.

As an analogy... you can kill a fly with a flyswatter or a sledgehammer. But one of those is much simpler to handle, and just as effective.

share|improve this answer

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can even use all of the RFC1918 ranges together at the same time. ;-)
  
  – Zac67
  9 hours ago
  

  
  
  
  

add a comment | 

3

It is merely a necessity constraint and personal preference.

If a Network is being built that would only have 10, or 20, or 50, or even 100 hosts, there is no reason not to use a /24 from 192.168.0.0/16. This is why home networks typically use the 192.168.0.0 range.

If a Network is being built that would (in all growth projections) only have up to 1000 or 2000 users, then picking a few /20's in the 172.16.0.0/12 range is perfectly reasonable.

If a Network is being built that would (in all growth projections) possibly exceed that, then the 10.0.0.0 IP space is ideal.

That said, there are no rules or regulations. Anyone is free to use the 10.0.0.0 range or the 192.168.0.0 range for whatever network(s) they want.

As an analogy... you can kill a fly with a flyswatter or a sledgehammer. But one of those is much simpler to handle, and just as effective.

share|improve this answer

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can even use all of the RFC1918 ranges together at the same time. ;-)
  
  – Zac67
  9 hours ago
  

  
  
  
  

add a comment | 

It is merely a necessity constraint and personal preference.

If a Network is being built that would only have 10, or 20, or 50, or even 100 hosts, there is no reason not to use a /24 from 192.168.0.0/16. This is why home networks typically use the 192.168.0.0 range.

If a Network is being built that would (in all growth projections) only have up to 1000 or 2000 users, then picking a few /20's in the 172.16.0.0/12 range is perfectly reasonable.

If a Network is being built that would (in all growth projections) possibly exceed that, then the 10.0.0.0 IP space is ideal.

That said, there are no rules or regulations. Anyone is free to use the 10.0.0.0 range or the 192.168.0.0 range for whatever network(s) they want.

As an analogy... you can kill a fly with a flyswatter or a sledgehammer. But one of those is much simpler to handle, and just as effective.

share|improve this answer

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

share|improve this answer

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

answered 10 hours ago

EddieEddie

10.2k22 gold badges2525 silver badges6363 bronze badges

1

As Eddie has very well explained, there's not much difference in which range you use.

One tiny difference there is though: since 192.168.0.0/16 is allocated from the former C-class range 192.0.0.0/3 many systems default the network mask to 255.255.255.0 or /24. Those same systems default a 172.16.0.0/12 subnet to B-class, /16, and and 10.0.0.0/8 subnet to /8. So, the use of a /24 may come more "natural" with 192.168.x.y.

In our company we use 172.16.0.0/12 for historical reasons, with /24 subnets. When setting up something new I very often have to adjust the default /16 mask to /24. As it seems, classful networking isn't quite dead yet - but it should be.

share|improve this answer

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I would say in my experience, businesses/corporations tend to make more use of 10.0.0.0/8 and 172.16.0.0/12 more often than 192.168.0.0/16. Making consumer devices that use 192.168.0.0/16 for home devices makes sense as it helps to avoid any sort of IP space "overlap" when using features such as VPN.
  
  – YLearn♦
  6 hours ago
  

  
  
  
  

add a comment | 

1

As Eddie has very well explained, there's not much difference in which range you use.

One tiny difference there is though: since 192.168.0.0/16 is allocated from the former C-class range 192.0.0.0/3 many systems default the network mask to 255.255.255.0 or /24. Those same systems default a 172.16.0.0/12 subnet to B-class, /16, and and 10.0.0.0/8 subnet to /8. So, the use of a /24 may come more "natural" with 192.168.x.y.

In our company we use 172.16.0.0/12 for historical reasons, with /24 subnets. When setting up something new I very often have to adjust the default /16 mask to /24. As it seems, classful networking isn't quite dead yet - but it should be.

share|improve this answer

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I would say in my experience, businesses/corporations tend to make more use of 10.0.0.0/8 and 172.16.0.0/12 more often than 192.168.0.0/16. Making consumer devices that use 192.168.0.0/16 for home devices makes sense as it helps to avoid any sort of IP space "overlap" when using features such as VPN.
  
  – YLearn♦
  6 hours ago
  

  
  
  
  

add a comment | 

As Eddie has very well explained, there's not much difference in which range you use.

One tiny difference there is though: since 192.168.0.0/16 is allocated from the former C-class range 192.0.0.0/3 many systems default the network mask to 255.255.255.0 or /24. Those same systems default a 172.16.0.0/12 subnet to B-class, /16, and and 10.0.0.0/8 subnet to /8. So, the use of a /24 may come more "natural" with 192.168.x.y.

In our company we use 172.16.0.0/12 for historical reasons, with /24 subnets. When setting up something new I very often have to adjust the default /16 mask to /24. As it seems, classful networking isn't quite dead yet - but it should be.

share|improve this answer

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges

share|improve this answer

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges

answered 9 hours ago

Zac67Zac67

37.3k22 gold badges2626 silver badges7272 bronze badges