Public CIDR Lists for Red Hat (IP Addresses for cdn.redhat.com)

Updated -

Downloads from Red Hat Network through yum are now provided by a content delivery network (CDN), resulting in significantly faster download speeds than previously available. The yum client is directed to a content repository that is geographically near to the requesting machine.

In some cases, your firewall may be blocking access to the CDN URLs, which would result in yum being unable to complete downloads from Red Hat. In this case, your current firewall settings will need to be updated if you wish to download content from the CDN utilizing Red Hat Subscription Management.

Note: Updates are always delivered from the hostname cdn.redhat.com unless a system has been intentionally reconfigured to download from another source. For example, some customers may wish to configure their systems located in China to download from china.cdn.redhat.com for better performance.

The IP address of our default source cdn.redhat.com is dynamically provided by a third-party based on geographical location, and as such is subject to change. It's recommended to allow-list the domain itself if possible or all IPs in the range provided in this article. Customers who are not using the most up-to-date IP list (below) could see intermittent errors when downloading content - the error returned by yum and/or Red Hat Satellite server would be: [Errno 256] No more mirrors to try.

If cdn.redhat.com is found to resolve to any address outside of this range listed below, please open a support case and report your client's IP/hostname along with the IP address that cdn.redhat.com is resolving to. From the range of IPs on this list, not all IPs will resolve to cdn.redhat.com at any given time. As such, it is advised to not allow select IP addresses from this list but ALL IP addresses on this list. This will prevent any interruptions in access to content from load balancing changes done within Akamai's infrastructure.

Container registries and Universal Base Image (UBI) repositories

Red Hat does not have an IP list for the container registry domains or cdn-ubi.redhat.com the way we do for cdn.redhat.com. If you need to firewall off the registry and/or UBI repositories, we recommended using a proxy (e.g., squid) and allow-list the domains:

  • registry.access.redhat.com
  • registry.redhat.io
  • registry.connect.redhat.com
  • sso.redhat.com
  • cdn-ubi.redhat.com

Complete list of IP addresses

The complete list is below and is also available in JSON format. If you are looking only for the recent changes as of July 6 2017, a list of the differences is also included further down for convenience.

Current complete list:

104.67.28.83/32
104.68.188.83/32
104.76.92.83/32
104.78.76.83/32
104.81.246.83/32
104.82.76.83/32
104.83.76.83/32
104.83.82.83/32
104.83.92.83/32
104.91.156.90/32
104.94.102.83/32
104.98.240.125/32
114.108.188.251/32
173.222.100.251/32
173.222.116.251/32
173.222.140.251/32
173.222.144.251/32
173.222.152.251/32
173.222.164.251/32
173.222.188.251/32
173.222.192.251/32
173.222.204.251/32
173.222.212.251/32
173.222.216.251/32
173.222.224.251/32
173.222.244.251/32
173.223.140.251/32
173.223.152.251/32
173.223.172.251/32
173.223.228.251/32
173.223.36.251/32
173.223.48.251/32
173.223.92.83/32
182.51.200.251/32
184.26.176.251/32
184.26.180.251/32
184.27.248.251/32
184.27.40.251/32
184.50.16.251/32
184.51.24.251/32
184.51.36.251/32
184.51.68.251/32
184.84.184.251/32
184.84.188.251/32
184.84.192.251/32
184.84.196.251/32
184.84.200.251/32
184.85.176.9/32
184.86.236.251/32
2.16.128.83/32
2.16.212.251/32
2.16.30.83/32
2.17.124.251/32
2.18.220.251/32
2.20.12.251/32
2.21.145.130/32
2.22.0.251/32
2.22.12.251/32
2.22.220.83/32
209.132.183.107/32
209.132.183.108/32
23.0.172.83/32
23.0.230.83/32
23.0.236.83/32
23.1.188.83/32
23.1.44.251/32
23.1.8.251/32
23.10.12.83/32
23.10.60.83/32
23.12.236.83/32
23.13.176.251/32
23.13.44.83/32
23.14.44.83/32
23.15.132.83/32
23.15.204.251/32
23.15.248.251/32
23.194.220.83/32
23.194.236.91/32
23.197.60.83/32
23.198.104.83/32
23.198.106.83/32
23.204.100.83/32
23.206.76.83/32
23.207.148.112/32
23.212.102.83/32
23.215.140.83/32
23.221.20.83/32
23.222.172.83/32
23.223.76.83/32
23.3.140.251/32
23.3.247.117/32
23.32.12.83/32
23.38.116.83/32
23.40.12.83/32
23.42.76.83/32
23.45.224.251/32
23.46.2.83/32
23.48.80.251/32
23.49.52.251/32
23.5.124.83/32
23.50.99.181/32
23.51.12.83/32
23.51.156.83/32
23.52.60.20/32
23.54.12.83/32
23.57.112.251/32
23.57.124.251/32
23.58.0.251/32
23.58.148.251/32
23.58.8.251/32
23.58.90.83/32
23.59.92.251/32
23.60.144.251/32
23.61.124.251/32
23.63.144.251/32
23.63.150.83/32
23.63.16.251/32
23.64.142.83/32
23.64.4.251/32
23.64.56.251/32
23.65.16.251/32
23.65.200.83/32
23.65.216.83/32
23.66.152.83/32
23.66.40.83/32
23.75.218.83/32
59.151.136.251/32
72.246.48.83/32
72.247.112.251/32
72.247.116.251/32
88.221.236.251/32
88.221.44.251/32
88.221.56.251/32
95.100.244.251/32
95.101.100.251/32
95.101.104.251/32
95.101.152.251/32
95.101.156.251/32
95.101.160.251/32
95.101.164.251/32
95.101.188.251/32
95.101.4.251/32
95.101.44.251/32
95.101.48.251/32
95.101.56.251/32
95.101.60.251/32
95.101.64.251/32
95.101.84.251/32
95.101.92.251/32
95.101.96.251/32
96.17.0.251/32
96.6.32.251/32
96.6.36.251/32

New addresses added as of July 6 2017:

104.67.28.83/32
104.68.188.83/32
104.76.92.83/32
104.78.76.83/32
104.81.246.83/32
104.82.76.83/32
104.83.76.83/32
104.83.82.83/32
104.83.92.83/32
104.91.156.90/32
104.94.102.83/32
104.98.240.125/32
173.223.92.83/32
209.132.183.107/32
209.132.183.108/32
2.16.128.83/32
2.16.30.83/32
2.22.220.83/32
23.0.172.83/32
23.0.230.83/32
23.0.236.83/32
23.10.12.83/32
23.10.60.83/32
23.1.188.83/32
23.12.236.83/32
23.13.44.83/32
23.14.44.83/32
23.15.132.83/32
23.194.220.83/32
23.194.236.91/32
23.197.60.83/32
23.198.104.83/32
23.198.106.83/32
23.204.100.83/32
23.206.76.83/32
23.212.102.83/32
23.214.72.83/32
23.215.140.83/32
23.221.20.83/32
23.222.172.83/32
23.223.76.83/32
23.32.12.83/32
23.3.247.117/32
23.38.116.83/32
23.40.12.83/32
23.42.76.83/32
23.46.2.83/32
23.50.99.181/32
23.51.12.83/32
23.51.156.83/32
23.5.124.83/32
23.52.60.20/32
23.54.12.83/32
23.58.90.83/32
23.63.150.83/32
23.64.142.83/32
23.65.200.83/32
23.65.216.83/32
23.66.152.83/32
23.66.40.83/32
23.75.218.83/32
72.246.48.83/32

Addresses removed as of July 6 2017:

173.222.128.251/32 
173.223.132.251/32 
173.223.168.251/32 
184.25.160.251/32 
184.25.244.251/32 
184.51.140.251/32 
2.17.184.63/32 
2.20.16.251/32 
23.211.152.245/32 
23.62.151.53/32 
95.101.108.251/32 
95.101.124.251/32
96.17.184.251/32

Addresses removed as of May 14 2021:

173.223.96.251/32 
184.51.48.251/32 
23.214.72.83/32 
23.61.12.251/32 

New address added after October 1, 2022:

184.85.176.9/32

To get a list of public IP addresses for api.access.redhat.com or cert-api.access.redhat.com please refer: How do I configure my firewall for api.access.redhat.com?

34 Comments

This is a page that commonly gets given to network admins, which may or may not have a Red Hat Portal login. Can you please make theis page and the JSON list available without logging in?

Is there a similar list for subscription.rhn.redhat.com? I got burned this week when the IP changed and wasn't in my firewalls.

Hello, seems there is only one IP address, see Knowledgebase solution What is the IP address range for 'subscription.rhn.redhat.com'

Yes, Firewall team, allowed the traffic for cdn.redhat.com as well

Hi, Just noticed that our Firewall also needed to add subscription.rhsm.redhat.com which is 209.132.183.108 and that isn't listed in the above CIDR list. I think the above list might be a bit out of date.

Hello, that IP addresses for subscription.rhsm.redhat.com is not listed above because it is not part of the content delivery network (CDN). (See my post on 13 January 2016 1:43 PM). We could try to make it more prominent.

Thanks, makes sense. I think I was fooled by the title being Public CIDR lists and I assumed that would cover all of RedHat's network space, not just the external CDN.

The IP address of subscription.rhsm.redhat.com has been changed to 209.132.178.16 on Mar 2022.

Ref:

https://status.redhat.com/incidents/14bnmndnc5yt "subscription.rhsm.redhat.com domain will begin resolving to a new public IP address. If you allow list particular IP addresses on a firewall please ensure you add 209.132.178.16 to your allowed lists before this window to avoid additional service disruption. IP addresses for cdn.redhat.com will not change."

What is the IP address range for 'subscription.rhn.redhat.com' and 'subscription.rhsm.redhat.com'? https://access.redhat.com/solutions/2109761

Hmm, the JSON isn't actually valid JSON...it doesn't have commas between the prefixes.

I think this list might be out of date. My box is trying to connect to subscription.rhn.redhat.com at 209.132.183.107

Hey Alex! This is on me. I updated the list with a new list I was given and just now learned that the IP addresses weren't actually updated when I thought they were going to be. I'm rolling back the article now. I apologize for the inconvenience!

After the reversion to the older list, the list now no longer contains the 209.132.183.108/ subscription.rhsm.redhat.com address, (as mentioned by Bu Syseng above,) nor does it mention the 209.132.283.107/ subscription.rhsm.redhat.com which I was asking about that also appears to be needed for subscription management/yum to work.

Hello, Can someone please confirm the latest list?

Hello Mihir! This is on me. I updated the list with a new list I was given and just now learned that the IP addresses weren't actually updated when I thought they were going to be. I'm rolling back the article now. I apologize for the inconvenience!

Hello what is the port to access redhat site to get yum update and protocol? Please advice

Should be 443.

 ~]# grep -r port /etc/rhsm/rhsm.conf
# Server port:
port = 443
# port for http proxy server
proxy_port =

Where are the IPv6 addresses?

zip file has not been updated.

Updated now, thank you.

This KB article is out of date at least 4 of the ips listed on this page are not controlled by Redhat as at 24th July 2017 eg 173.222.128.251 173.223.168.251 184.25.160.251 184.51.140.251

The page is not automatically updated. It is up to customers to report inaccuracies rather than RedHat taking ownership of this.

The list seems to currently be missing at least 173.222.100.251 which my systems DNS recieved for cdn.redhat.com this afternoon.

How to whitelist the domain to access to CDN URLs I am getting error [Errno 256] No more mirrors to try

Well there are multiple potential solution. First see if you have firewalld or iptables, if you do make sure those rules aren't blocking your connections. If you have a corporate proxy server, try setting up your box to use a proxy server for either subscription mangement and yum; the users that yum runs as; or for the entire box. (Note you may also need to have your proxy server admin add the url's to their white list.) If you have a corporate firewall ask them if they except host names. If they accept them provide the host name rules from https://access.redhat.com/solutions/65300, If insist on using numbers instead of host names, you should follow this document, so that you received notice of when it changes and can ask your firewall team to modify there rule with the new information. (This document can change frequently.)

If you still can't connect, try opening a support contract case with redhat.

Is this only for the yum repository ? is registry.access.redhat.com available here ? Thanks

That is correct. This list is only for accessing software from the Customer Portal via yum. We do not have a list of IPs for the Red Hat Container Catalog. If you need to access the Container Catalog through a firewall, we recommended using a proxy (such as squid, etc) and whitelisting the domains: registry.access.redhat.com and access.redhat.com.

Hi, I try to provide to my security team the list of the IPs needed to access redhat ressouces like : registry.connect.redhat.com registry.redhat.io sso.redhat.com access.redhat.com

But none of this urls returns (via nslookup) an IP listed here... where can i get the ranges used by Redhat and its CDNs ?

That does not make any sense. RedHat has dynamic IP address for CDN. How can the firewall team accept opening ports to many IP addresses.

Could you please elaborate on "dynamic address for CDN"? Do you refer to resolving of cdn.redhat.com, or to registry.access.redhat.com / access.redhat.com?

cdn.redhat.com should always resolve to either of the IP addresses listed in this article.

registry.access.redhat.com / access.redhat.com can resolve to any address - this can be workarounded by having a squid or some other proxy and restricting access just to the two domains.

Having a squid means that this squid have a full acces to internet.... that is just not possible due to security policies... so there is no solution....

Should we expand the allow-list domains to cover openshift?

https://docs.openshift.com/container-platform/4.4/installing/install_config/configuring-firewall.html

The reason I am asking is I have a customer who is trying to sync https://catalog.redhat.com/software/containers/hpe3parcinder/hpe3parcinder16-1/5fab8e3569aea3467fdd1bb1. Pulp is then trying to download the blobs from oso-rhc4tp-docker-registry.s3-us-west-2.amazonaws.com after connecting to registry.connect.redhat.com. They have to whitelist this from their proxy to make the sync work.

Add IPv6 addresses, please.

Please add IPv6 addresses (it's 2022)