Subnetting for Video Surveillance

By John Scanlan, Published Apr 30, 2019, 09:40am EDT

This guide explains when subnetting is used on security networks, and how it works. We explain how to add or remove IP addresses to your range, borrowing bits, and the role of the subnet mask.

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****** **** ****** ** provide *********** **:

  • *** ********* **** *****
  • *** **** ** *** subnet ****
  • ********* *** ** ****
  • ********* *** ** ****
  • ****** *** ** ********

Why ****** ** ***** ************

***** *** * *** reasons ************** *** **** to ****** ***** ******** network, ******** *****:

  • ******* *** ** *********
  • ******* ********
  • **** ** **************

Running *** ** *********, *** ******* **********

*** **** ****** ** address ****** ** ***.***.*.* (a ***** * *******) which ******** *** **** addresses. *******, ** **** mid-sized ************ *** ******** systems, **** ** * school, ****, ** ***** facility, ***** ********* *** be ******* ******** ** cameras *** ****. *******, adding ****** ******* *** consume ** ******* *** each **********. ******** ****** to ******* ****** ******* consume ********** *********. ********* viewing ******** **** **** require *********, ***.

** ****** ******** ****** mask ** *** *** (255.255.255.0 ** ***.***.***.*), *** network ***** ** ********** 255 ********* ***** *** be **** *** ********** devices. ***** *** **** this **** ******, ** using * **** ** 255.255.240 ***** ******* ****** 4,000 ******* ** *** subnet.

Network ********

** ***** ********* ******* for ********* ******* ******** (e.g., ************ **. ******* LAN **. *****), * device ** ****** ** prevented **** ********* * device ** *******. ** simply ****** **** *** route ** *** ***** host.

********** ** **** ***** deployed *********, ***** ** **** more *********** ** ****.

Ease ** **************

********* ********** ****** *** to ****** ** ** scheme **** * ********* and ********** ****** ** hosts. **** ******** * network ** ***** ********** ****** * ***** ******* it ** ******* ** scan * ******* *******, closer ** ****** ** actual **-*** *******, ****** than **** ********* ** unused *********; *.*.

******** ***.**.*.* - ***.**.***.*** with ****** ***.***.*.* = 65,534 *********

******** ***.**.*.* - ***.**.*.** with ****** ***.***.***.*** = 30 *********

*** ******* **** *** classfull ****** **** **** take ***** * ***** to **** **** * discovery ****, ************ ** *******, ***** *** ******* subnet **** **** **** just *******.

Subnetting ******

*** ****** **** ** a ********* ************* ** the ** *******, *** determines ***** ***** ** an ** ******* ******* the "*******" **. *** "host." ** ********, *** vast ******** ** ********, surveillance ********, *** ******* subnet *****, **** ****** classfull **********, *** *** IP ******* *****, **** commonly ***.***.***.*.

[****, *** **** ***** we *** **** ********* with ******* ********* ***** are ****** **** * classes *****.]

*********Addresses / ******* ** *********

********** ******* *** ****** mask **** ********* (***** A = ***.*.*.*, * = ***.***.*.*, * = 255.255.255.0) ** ********* ***** borrowed **** ** ****** those ******, *** ** doing ** ******* *** amount ** ***** *** networks. *** *** ****** to ****** ******** ***** and ******** ******** ** decrease ***** *** ******** networks. *** ******* ***** shows *** ****** ***** for **** ***** *** the ****** ** ***** and ******** ********** **** each.

Default Subnet Masks and Classes

*** ***** ***** ***** how **** **** ** the ****** ****. *** network **** *** *'*, and * **** ** 8 *'* (********) = 255. *** **** **** are *'*, ***** ******** = *. *** ******* below ***** *** ******* subnet **** *** **** class, *** ********** ****.

Subnet Masks Represented in Bits

Subnet **** ********** ******** *** *****

********* **** *** ********* subnet ***** ** **********, also ****** ********* **********. The *** **** **** is **** ** ** borrowing **** **** *** other **** ** **** by ******** * ** 0 ** * ** 1. ** **** ***** are ******* **** **** are ******** **** *** network *******, *** **** more ******** *** ******* bits *** ******** **** the **** *******.

Subnets ** ***** ***********

*** ****** ****** ******** which ******* **** *** device *********, ****** ***** are **** ***** **** to ****** *** ******* to ** ********** ****** or *******. **** ** done ** ******** *** last ***** ** *** mask. *** ***** *** that ** *******, ** additional *** **** ****** becomes *********.

** * ********* *******, changing ****** **** **** 255.255.255.0 ** ***.***.***.* ** * ***.***.*.* network ****** ***** ** expand **** *** ***.***.*.* network ******* ***** * router, * ***** ** 510 ***** ******* ** 255, *********** ******** ********* IP *********. ******** *** mask ** ***.***.***.* ******* this ******* ** *,*** IPs (***.***.*.*-***.***.*.***). **** ** illustrated *****.

Subnetting Examples

** *** *** ****** masks ****** ********* *********, users *** ***** ********** ********* ****** ***********.

Comments (26)

Undisclosed Distributor #1

04/30/19 08:25pm

*** ***** ** *** skirts ** **, *** everyone ******** ** ******* up ******* ******** ****** be ******** **** *******.  This ******* *** ******* subnets *** ***** *** personal ***, *.*. ******* from *** ****** **** one ** ***** ********* will ** ******* ** the **** ******** ******* of ********* **/*********.  ***** subnets ******* **.*.*.*, ***.**.**.*-***.**.**.* and ***.***.*.*.

********** *** ** * tricky *****, ********** *** bit **** **** ******* unreachable *** ***** *** insane.  ** ***'** ***** this *** * ****** I ***** *** ***** books *** ***** **** networking ** ** ********* insightful (**** ** *** bit *****) **** ** you ***'* **** ** pursuing *** *************.

**** ***********!

 

Bob Brislin

IPVMU Certified | In reply to Undisclosed Distributor #1 | 05/01/19 12:33pm

******* *** * *** blocks *** ***** *** the ******* ***** :

**-*** *****: **.*.*.* ~ 10.255.255.255 : *-*** ****** (255.0.0.0)

**-*** *****: ***.**.*.* ~ 172.31.255.255: **-*** ****** (***.***.*.*)

**-*** *****: ***.***.*.* ~ 192.168.255.255: **-*** ****** (***.***.*.*)

 

 

Undisclosed Distributor #1

In reply to Bob Brislin | 05/02/19 01:36pm

******* ********** ***** ******** Version *, *** ******* IP **********.

*******

(****** ** ******* * better ****)

 

Bob Brislin

IPVMU Certified | In reply to Undisclosed Distributor #1 | 05/02/19 03:46pm

*** ******** - * meant *** ****

Undisclosed Integrator #2

05/01/19 01:19am

**** ** *** ****** me. * ***** * will **** **** ** interact **** * ******* containing **** **** *** devices. 

*** *** ***** * don't ***** ********** ** how *** ******** * router **** ** ******* of ***.***.*.* ** **** to ******** **** ********* with ** ******* ** of ***.***.*.***. ** **** 3rd ***** *****'* *****, wouldn't ** ** *********** by *** ******? ** does ** ****** ********* when *** ****** ***** is *******?

Avatar

Sergio Guzman

IPVMU Certified | In reply to Undisclosed Integrator #2 | 05/01/19 02:11am

**** **** ** ****** a ****** ***** *** you *** **** *** one *** ****. **'* not **** *********.

 

Avatar

Craig Mc Cluskey

In reply to Undisclosed Integrator #2 | 05/01/19 03:28am

*** ****** **** ********** which ***** ********* * device ** * ******** address *** *****. *** any *** ** *** subnet **** ***** ** a "*", *** ********* address **** ** ********* to **** ** *** device's ******** *******.

** *** **** * subnet **** ** ***.***.***.*, a ****** ** ***.***.*.* would ** **** ** reach ******* **          ***.***.*.* to ***.***.*.***. [**'* *** since *** ** ******* reserved.] *** ***** ***** "octets" ***** *** *** all "*"*, ** * reachable ******'* ******* **** be ********* ** *** first ***** ****** ** the ****** ** ***.***.*.*, i.e., ***.***.*  .

** *** ******* *** subnet **** ** ***.***.***.*, a ****** ** ***.***.*.* would ** **** ** reach ******* ** ***.***.*.* to ***.***.*.***.

*** *********** #*'* "****** mask ***** *********" ***** and ******* *******.****.***. (** *** *** really **********).

Undisclosed #5

In reply to Undisclosed Integrator #2 | 05/01/19 12:30pm

** **** ** ****** reachable **** *** ****** digit ** *******?

***, **** ** *** concept ** ****** ***** exactly.

**** *** ****** **** an ** ******* ***** to ******* ** ******* device **** ** ** address, *** ** *** first ****** ** ***** to ********* ** ** that ***** ****** ** on *** **** *** (meaning ** *** **** packets ** ** ********), or ** ** ** a ****** ******* (******* the ******* **** ** be **** ** * router, *** *** **** route **** ** *** appropriate ****** *******).

*** ****** **** *** local ** ******* *** used ** ******* ***** IPs *** ***** *** which *** ******.

** *** *** * subnet **** **** ***.***.***.***, then **** ******* ***** the *** ***** (*****) match ***'* *********** ** able ** **** ******* directly ** **** *****. (subnet ***** ***** *** 4th ***** *** ***-**** are **** ****** ** datacenters ***** *** ***** only ** ********* * IP ********* *** **** specific ***).

DC Long

In reply to Undisclosed Integrator #2 | 05/02/19 02:48am

*** ******* ** *** same ****** *** ** the **** ********* ******  talk ******** *** *** not ** ******** **** EACH *****.  * *** network **** *** ***** issues ** *** ****** broadcast ******.  ****** ******* private ******* **** ** routed ** * ******.  So *** **** **** router **** ** ***** Mikrotik, ***. ******** ******** **** Hippa ******* ******* ********* via ******** ******** **.  subnets

Undisclosed Distributor #1

In reply to Undisclosed Integrator #2 | 05/02/19 01:50pm

*** *** ***** **** to **** **** ******** containing **** **** *** devices, *** ******* *** that *** **** ********* networks **** **** ***** to **** **** ****.  The **** ****** ********* would ** * ***** business **** *** ********* a ***** ***** ** public ** ********* ** order ** **** ********* on ***** *** ******* and ******* ****** ** the ********.  *** *** will ***** *** ******* amount ** ** ********* that ** *** *** away **** (**** ****** pretty ******* *** ****** IP *********) *** **** will *** ** ********** to ** ****.  ** most ***** * ******* will *** * ***** of * ****** ** addresses ***** ** * 255.255.255.240 ****** (** ***** only * *** ******** accessible, *** ***** ** the ***** ** *** "network" ***** *** *** the **** ** *** block ** *** "*********" address, ******* ** *** 0's ** *** *******, broadcast ** *** *'*)

** **** *** ****** complex, * ***** **** myself ******* *** *** chart -> *** - 64 - ** - 16 - * - 4  - * - 1, *** * ***** it.

**** * ****'* ******* things *** **** ****.

 

Undisclosed Distributor #1

In reply to Undisclosed Distributor #1 | 05/02/19 03:24pm

**********: ***.***.***.*** ******** * block ** ** ** addresses, * ****** **** said ***.***.***.*** ******** * addresses, ** ***** * are ******.

Undisclosed #6

In reply to Undisclosed Integrator #2 | 05/02/19 11:58pm

*** *** *** *****://*******.***/** * **** ******'* tool ** **** *** many ******* *** *** reach ** ***** * static ** *** ********* angry.

*******:***.***.*.* ***:***.***.***.*

*******:***.***.*.* ***:***.***.***.*

****, ********..*** * ** bored, ****** ** ********* quotes.

Undisclosed #3

05/01/19 01:24am

**** * ****

Undisclosed Integrator #4

05/01/19 08:31am

***** *******! - ** you *** *** ** CCTV, ** ***** * book/course **** ******* *** recommend ** ******** ********** from ***** ***** ** a ****** ********?  

John Honovich

IPVM | In reply to Undisclosed Integrator #4 | 05/01/19 09:50am

#*, ****** *** **** first *******, ***, *** our **** ** ********** **** *** *** ****** **** ** ********** Course (***** ****** **** *******).

Avatar

Jon Dillabaugh

Pro Focus LLC
05/01/19 12:08pm

**** * ***** ******** here. **** *** ******** your ******* ****, ** isn’t ****** **********, **’* called ************. *** ****** that *** *** ****** something *******. ***** ***** making ** ******. 

Avatar

Lynn Harold

In reply to Jon Dillabaugh | 05/03/19 07:24pm

*** **** ** ** it!  * *** ***** to **** ***, **** if ***** ** **** the ******** *********** ** increasing *** ***** ** your *******, ** ** certain ** ***** *** critical/static ********* ** *** bottom ** *** ******* scope.  *** *******, *** x.x.x.1 *** **** ******* Default ******* (******** ********* like .* *** .* will ** *** ******** interfaces *** *********/******** *******) and ******* *** **** of *** ******-***** **** octet ******* *** ***** network-specific *******. **** ***, if *** **** **** to ******, *** ***'* have ********* *** **** devices, *** *** ******* gear *****'* *** ** the ****** ** **** address ****** (*'* ***** that ***).

*** * ******/***** **************, I ****** **** ** addressing ****** ***** ** the ***** ***-* ************, plus * * **** out ********* ********* ********.  Something **** **** -

*.*.*.* - ******* *******
*.*.*.* - ******* */*
*.*.*.* - *.*.*.** - network *******, ***, ****, etc.
*.*.*.** - *.*.*.** - servers, *******, ************ (*****)
*.*.*.** - *.*.*.** - encoders, ********, *****, */*, intercoms
*.*.*.** - *.*.*.** - reserved *** ***-*****-**** *** come
*.*.*.** - *.*.*.*** - cameras (******-**) *** ****** control (***-****)

*** * ****** **************, video *** ****** (*** intrusion?) ***** ** ** separate *****.

Undisclosed #6

In reply to Jon Dillabaugh | 05/03/19 11:07pm

**** *** * ****** is ****** * *** of ******* *** ***** a ***** ** ***** a ***** ** * supernet. ***** ** **** add ***/***** **** ** IPv6 ** ******* ************** the ****** ***** ** noobs.

Avatar

Jon Dillabaugh

Pro Focus LLC
In reply to Undisclosed #6 | 05/03/19 11:33pm

*** *** ** ***** tag ** ***** *** relation ** * ******** subnet **** *** * given ******* *****. *** networks *** ******* **** subnets. *** ********** ** whether **’* * ****** (super) ** ******* (***) subnet **** *** ******** subnet. 

Avatar

Cary Menage

IPVMU Certified | 05/03/19 09:14am

*** **** ****** ********* tools **** *** ******* to **** **** ************? I **** **** ** lacked **** ******* ** their ********* **** * few ***** ****, **** only *** ******* *** A,B ** *.

**** ********** ** **** tools *** ************* ******** NIC's ** ******* ********.

 

** ***** ***** ** amaze **, *** **** of ***** "*********" **** fundamental ********** *********...

Avatar

Mike Dotson

Seneca | IPVMU Certified | In reply to Cary Menage | 05/03/19 06:14pm

****...* *** ******** ** Scanner *** *** **** and ** **** *** all *** ****** **** on * ******* *** allows *** ** **** all ** **** ** a ****.  * **** useful ****.

Vasiles Kiosses

06/04/19 03:41pm

** *** **** * similar ****** ** ****?  Address ***** ****** ** away **** ** *** a **** ************* ** the ************* ** **** important.

Avatar

Bobby Mancia Jr.

MIZELA Corporation
IPVMU Certified | 06/09/19 09:48am

****** * ***** ****** masks ** *** ********* cameras?

Avatar

Jon Dillabaugh

Pro Focus LLC
In reply to Bobby Mancia Jr. | 06/09/19 01:31pm

*** *** ******* ********* devices **** **** * common ****** ****. 

Undisclosed #7

IPVMU Certified | In reply to Jon Dillabaugh | 06/09/19 06:47pm

*** *** ******* ********* devices **** **** * common ****** ****.

Avatar

Bobby Mancia Jr.

MIZELA Corporation
IPVMU Certified | 06/09/19 10:51pm

** ***, ***** *** for **** ********. **** goes ** *** *#*.

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