CREST-accredited NETWORK penetration testing
Network penetration testing service
CodeShield delivers CREST-accredited network penetration testing to organisations across the UK, from multi-site enterprises and manufacturers to logistics, retail, and professional services firms with complex internal infrastructure.
Following the industry-recognised PTES methodology, we simulate real-world attacks across your internal and external networks to uncover the weaknesses an attacker would actually use. No automated scan dressed up as a pen test. Just clear, prioritised findings and practical remediation advice from a dedicated expert who works with you from scoping through to fixing every issue we find.
What our network penetration testing covers
Your network is the backbone of your business, and its attack surface stretches from the public internet right through to the devices on your office floor. We test all of it, combining the PTES framework with deep manual analysis to find the flaws that automated tools miss.
WHY TRUST CODESHIELD
Trusted & Independently verified.

Client’s we’ve worked with.
CREST-accredited network penetration testing you can trust
When it comes to security testing, credentials matter. CodeShield is a CREST-accredited penetration testing company, holding one of the most respected accreditations in the industry.
CREST accreditation isn’t a badge you buy. It’s independent proof that our methodologies, technical expertise, data handling, and quality processes have been rigorously assessed against internationally recognised standards. For you, it means the testing of your network is carried out to a benchmark your clients, auditors, and stakeholders already know and trust.
Why CREST accreditation matters for your business:
- Independent assurance: your testing is validated against standards set and monitored by the industry’s leading not-for-profit accreditation body.
- Procurement-ready: many enterprise customers and public sector frameworks require, or strongly prefer, a CREST accredited provider before they’ll engage.
- Compliance confidence: CREST accredited testing supports frameworks like ISO 27001, SOC 2, and PCI DSS, giving auditors the credible evidence they’re looking for.
- Certified people, not just a certified company: our testers hold individual industry certifications from bodies including CREST and Offensive Security, so your project is always in expert hands.
When you choose CodeShield, you’re partnering with a trusted UK security consultancy that combines independent accreditation, technical excellence, and clear guidance to protect your business against real-world threats.
Network penetration testing for infrastructure-heavy and multi-site organisations
Network penetration testing matters most to organisations with larger, more traditional IT estates, especially those spread across multiple locations or handling sensitive operational data.
If you run larger internal networks, operate from multiple offices, or rely on remote access and corporate Wi-Fi, network penetration testing should be part of your security programme.
Meet your compliance requirements with confidence
Many organisations first come to us because a framework, auditor, or enterprise customer requires independent testing of their network. We make that requirement straightforward to meet, and turn it into genuine security improvement.
Our network penetration testing supports:
You’ll receive a clear, audit-ready report that maps findings to what your framework actually asks for, plus practical remediation advice to close the gaps, not just document them.
WHY CODESHIELD – 20+ YEARS EXPERIENCE
You work with the person doing the testing.
At CodeShield, our UK penetration testing team brings 20+ years of combined expertise delivering practical, results-driven security solutions tailored to your business.
You work directly with a fully-qualified pen tester. You meet them before you pay, so you know who you’re working with.
TRUSTED UK PENETRATION TESTERS
Contact CodeShield today to get a quote or work with us
At CodeShield, our UK penetration testing team brings 20+ years of combined expertise delivering practical, results-driven security solutions tailored to your business.
What makes our network penetration testing different
Our Values
What’s in your network penetration testing report
The report is where a penetration test earns its value. A test is only as useful as the document that comes out of it, and ours are built to be read and acted on, not filed away. Every engagement ends with a clear, structured report that works for your technical team and your senior stakeholders alike.
See a sample report
Want to see the quality of our reporting before you commit? Download an anonymised sample network penetration testing report and see exactly what you’ll receive: the structure, the depth of detail, and the clarity of our remediation advice.
START HERE
Not sure which test you need?
Most people searching “pen test” aren’t sure yet, that’s normal. Pick the closest match, or talk it through directly with a tester. We can incorporate multiple testing types for a single project. We often do web app + network testing if a business wants to cover both.
When do you need a network penetration test?
Network penetration testing isn’t a one-off box to tick. It’s something to build into the key moments in your organisation. You should consider a test when:
- You’ve made significant infrastructure changes: new servers, network segments, migrations, or integrations can introduce weaknesses that weren’t there before.
- You’re preparing for a compliance audit: ISO 27001, SOC 2, PCI DSS, Cyber Essentials Plus and similar frameworks expect independent testing as part of certification.
- A customer or partner is asking for it: enterprise procurement and due diligence increasingly require evidence of network testing before they’ll sign.
- You’ve opened a new office or site: every new location adds connectivity, remote access, and segmentation that needs testing.
- Your working patterns have changed: a shift to remote or hybrid working expands your attack surface through VPNs and remote access.
- You’ve had a security incident: verify that the gap is closed and check for anything else an attacker may have reached.
- It’s simply been a while: best practice is at least once a year. If you can’t remember your last test, you’re overdue.
Not sure which of these applies to you? A quick scoping conversation will tell you what you need, and just as importantly, what you don’t.
LIVE REPORTING
Stay informed throughout your penetration test with real-time access to findings through our secure client portal.
As vulnerabilities are identified, they’re immediately available for your team to review, giving you complete visibility into the assessment as it progresses. Any High or Critical findings are communicated straight away via your agreed contact channels, ensuring urgent risks are never left waiting until the final report.
Our collaborative approach also allows for interactive re-testing during the engagement. As fixes are implemented, our consultants can validate them in real time, helping to reduce outstanding vulnerabilities before testing is complete.
At the end of the engagement, your portal is updated with the final quality-assured report, providing a comprehensive record of the assessment, findings, remediation guidance, and supporting evidence.

TRUSTED UK PENETRATION TESTERS
Contact CodeShield today to get a quote or work with us
At CodeShield, our UK penetration testing team brings 20+ years of combined expertise delivering practical, results-driven security solutions tailored to your business.
Network penetration testing FAQs
Industry best practice is to test at least annually, and after any significant change to your infrastructure. Frameworks such as PCI DSS and ISO 27001 typically require annual testing. We’ll help you define the right cadence for your organisation.
Yes. Our support doesn’t end at the report. Once you’ve addressed the findings, we can retest to confirm the fixes are effective, giving you and your stakeholders verified assurance that the risks have been closed.
Our testing is designed to minimise disruption. We agree all rules of engagement with you during scoping, and where any activity carries a risk to stability, we plan it carefully and keep you informed throughout.
External testing assesses your internet-facing perimeter, while internal testing simulates an attacker who is already inside your network. A complete strategy usually includes both, and we’ll help you decide the right combination for your risk profile during scoping.
A vulnerability scan is automated and flags known issues. A penetration test adds expert human analysis, actively exploiting weaknesses to understand the real business impact and uncovering the misconfigurations, credential issues, and lateral movement paths that scanners simply cannot find.
The cost depends on scope: the size and complexity of your network, the number of live hosts and sites, and whether you need internal testing, external testing, or both. Rather than quote a misleading flat rate, we scope every engagement individually so you only pay for testing that delivers real value. Get in touch for a tailored quote.



















