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Static IP Addresses for Business Broadband

Many SME apps assume a fixed public IPv4: site-to-site VPN, inbound RDP jump hosts, legacy CCTV and some VoIP edge cases. Consumer-style CGNAT breaks those patterns — business tariffs often bundle one or more statics.

Next step: Quote broadband with the right IP option. Contact us if your VPN stopped working after a “fibre upgrade”.

CGNAT in plain English

Carrier-grade NAT shares one public IPv4 across many customers. Outbound browsing works; unsolicited inbound sessions do not. If your supplier moved you to CGNAT silently, remote access breaks without a relay or tunnel service.

rDNS and mail reputation

Some providers offer reverse DNS on statics — useful for legitimate app servers, irrelevant for Office 365 or Google Workspace mail. Do not run bulk email from a residential-style IP; deliverability will suffer.

IPv6 alongside IPv4

Dual-stack can future-proof services — see IPv6 guide. Firewall rules must cover both families; many SMEs still anchor policy on static IPv4 for simplicity.

Security hygiene

A static IP is discoverable by port scanners. Prefer VPN over exposing RDP/SMB directly; use geo-blocking and IDS on the router where available.

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