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IP address changes every few minutes


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 Contributor
  • 1 reply

Hi,

I am using an ID SIM in a Zyxel NR5103e 5G router. I’ve got a fast connection, but the IP address is changing every few minutes, which is causing problems with some of the services I run that rely on DDNS. They’re not updating quickly enough so I can never connect. I have tried changing the APN to id, 3mobile and three.co.uk with PDP set to IPV4, but this hasn’t helped. Does anyone have any ideas what I could try instead?

Thanks

Guyan

Best answer by WelshPaul

This is normal. iD Mobile, like the majority of UK networks, uses CGNAT.  

It's just the THREE network, as far as I know, that doesn’t, using the APN '3internet’.

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4 replies

Kash
iD Mobile Employee
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  • iD Mobile Employee
  • 8175 replies
  • April 22, 2025

Hi ​@guyank,

Welcome to the Community!

Are you in the UK or abroad?

Someone from the Community may know more about this and be able to assist you further.

 

Kash


  • Author
  • New
 Contributor
  • 1 reply
  • April 22, 2025

I’m in the UK. 


Kash
iD Mobile Employee
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  • iD Mobile Employee
  • 8175 replies
  • April 22, 2025

Hi ​@guyank,

I don’t know much about what you have mentioned but another Community user may be able to help.

Do you get the same issue in a handset or another device?

 

Kash


WelshPaul
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  • Platinum 
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  • 2744 replies
  • Answer
  • April 22, 2025

This is normal. iD Mobile, like the majority of UK networks, uses CGNAT.  

It's just the THREE network, as far as I know, that doesn’t, using the APN '3internet’.