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Network Address Renumbering
Plan and execute network renumbering across Cisco or Meraki environments, tracing application dependencies and validating routing, DNS and access rules.
Devices supported
across the UK
Client locations
supported
Traffic handled
at peak time
Average
response time
Average response is not a resolution time or a contractual guarantee. Support scope and response commitments are agreed for each engagement.
Network address renumbering changes the addressing used by devices and services without losing sight of everything that refers to those addresses. MCI plans renumbering work in Cisco and Meraki environments around routing, access policies, application dependencies and operational records. The objective is a coherent new address plan with a controlled transition from the old one.
Renumbering may be necessary after an acquisition, to resolve overlapping networks or to simplify an estate that has grown without a consistent plan. It can also be one part of a wider migration. The important point is to treat an address as a dependency used by many systems, not just a value on a network interface.
A clear requirement
Turn the business need into a practical network scope with visible dependencies.
A controlled delivery
Plan implementation, testing and rollback before production changes begin.
A supportable result
Leave useful records, ownership and escalation routes behind.
Establish the reason and the scope of the change
We identify which ranges need to change and why. The target plan should solve the underlying problem rather than simply move the conflict to another part of the estate. Site structure, routing boundaries and future growth all influence the design.
The scope distinguishes network infrastructure, servers, client networks and connected devices. Some receive addresses dynamically; others may have static settings or external references that require a coordinated change.
Where the estate is not well understood, discovery and inventory can establish the starting point. An incomplete inventory makes it difficult to know whether the old range is genuinely unused after the migration.
Standards & partnerships
Confidence in the team behind your network.
Cisco Partner
Cisco Meraki
Cyber Essentials
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Find the systems that refer to the existing addresses
Routing and firewall rules are only part of the dependency list. Name resolution, monitoring, backup systems, authentication, application configuration and provider allowlists may also contain address references.
We work with the owners of those systems to identify the required changes and their timing. The network team should not assume that updating a subnet will automatically update an application or an external organisation’s access policy.
Hard-coded references deserve particular attention. Where they can be replaced with a more maintainable arrangement, that can be considered as part of the design. However, an address-change project should not silently expand into an unrelated application redesign without a clear decision.
A useful starting point
Not sure where to start?
Bring the requirement. We will help you define the engineering work.
Design the transition between old and new ranges
The plan identifies how services will move and whether old and new addressing need to coexist temporarily. Routing, translation or staged device changes may be relevant, depending on the environment and application behaviour.
Intermediate states need defined boundaries. Temporary reachability should permit the required transition without introducing unintended access or ambiguous return paths. Each temporary mechanism needs a purpose and a condition for removal.
For Cisco and Meraki platforms, the implementation is checked against the actual feature support and management model. A design that is straightforward on one device may require a different approach on another, particularly where routing and policy ownership are split.
Different environments. The same care.
Built around the work
your network supports.
Finance, banking and the wider private sector. We start with the systems and people that depend on your connections.
Finance & banking
Market-data paths, routing and provider coordination on clients’ behalf.
Financial-market services ↗Offices & multi-site teams
Reliable access between people, workplaces and business applications.
Office network design ↗Data centres & cloud
Network boundaries, workload connections and operational ownership.
Data centre networks ↗Coordinate the execution with application validation
The change sequence links network actions to the systems that depend on them. It identifies when address allocation, routing, access policy and application settings change, and who confirms the result at each stage.
Testing should use representative business activity as well as network checks. A host responding on its new address does not prove that the application, monitoring and external connections have all been updated.
Cutover and rollback planning establishes the checkpoints and route back. Reversal may need coordinated changes across several systems, so it should not be reduced to restoring one device configuration.
Retire the old addressing and update the records
After acceptance, old routes, policies and address assignments are reviewed for removal. Leaving both states active indefinitely can obscure which paths are still in use and preserve access that no longer has a purpose.
The address plan, inventory and operational documentation are updated to describe the delivered environment. Monitoring and support teams need the new information so the next incident does not begin with an obsolete diagram or an alert referencing a retired address.
Where the renumbering supports a merger or a wider architecture change, the final state is checked against that programme. The address project should leave the next stage easier to implement, not add another undocumented exception.
Address renumbering questions
Can we avoid changing every device at once?
Often. A phased approach may be possible where the routing and application dependencies support it. The interim design must be explicit, including how old and new ranges communicate and how temporary arrangements will eventually be removed.
Will changing DNS records be enough?
Not necessarily. Some systems use direct address references, cached information or policies outside DNS. We identify those dependencies before the change rather than assuming that a name-resolution update will reach every application and provider.
Is address translation a permanent alternative?
It can be appropriate for some requirements, but it introduces its own design and operational considerations. We assess the actual use case and explain the consequences rather than treating translation as a universal substitute for a coherent address plan.
What should we provide first?
The reason for renumbering, affected ranges and known application or provider dependencies are useful. Plan network address renumbering so discovery, sequencing and validation are included before production changes are scheduled.
Talk to a specialist
What does your network need next?
Tell us what you are planning, changing or trying to improve. We will help define a practical next step and the engineering scope.
+44 203 196 6566Choose option 1
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