What Defensible does

Defensible is an Irish information security, Network Reliability Engineering, and technical marketing consultancy founded around 2017 and operated from Dublin by a small distributed team led by founder Dónal Ó Duibhir (CISSP #32103, CCNP, CCDP, CWNA, JNCIA) and network engineer Cristian Sirbu (CCIE #43453, JCNIA, M.Sc.). The firm sells independent, practitioner-led engagements to a horizontally segmented client base that includes multinational enterprises (notably Juniper Networks), startups (Tito), and coworking-space operators (Dogpatch Labs, Betahaus, Hub, and Hub Australia, the last under the Podomere brand). Its revenue model is professional services, monetised through flexible, micro-sliced remote consulting packs called 'Engage', sold in minimum half-hourly drawdowns with advance scheduling, and a dedicated Schools vertical that packages network and security design, strategy, framework, and vendor delivery for educational institutions.

The firm's core technology asset is PanSift, a lightweight agent and SaaS platform purpose-built to give technical teams instant remote troubleshooting of network, Wi-Fi, DNS, IPv4, IPv6, and system issues, positioned as a tool to control time and eliminate toil for distributed engineering teams. Adjacent assets include Defensible Data Viz (SecViz), an experimental Deck.gl-based interactive geographic visualisation of RIPE IPv4/IPv6 NETBLOCK distributions with a stated roadmap to overlay zmap vulnerability scans for a live visual risk index, and Jumpstart Signal, a job/career signal aggregation platform housed at jumpstartsignal.com. The 'Beyond the SOC' content series covering OODA loops, security observability, zero trust, ephemeral infrastructure, AIops, and detection engineering functions as both thought-leadership IP and a top-of-funnel marketing channel via the company blog and the founder's Twitter (@irldexter) and LinkedIn presence. Partnerships with RIPE NCC for registry data and the Network Operator Group (INOG) for community engagement extend the firm's reach into operator networks.

The business operates without disclosed institutional funding, with no recorded funding rounds, and as a founder-owned private entity registered in Ireland (VAT# IE 3490731JH). The channel mix is direct: content marketing (blog and social) drives top-of-funnel interest, while consulting and professional services engagements are delivered by principals. Pricing is not publicly disclosed; all rates exclude local VAT. The firm has no disclosed certifications, regulatory actions, M&A activity, patents, or awards, and its operating geography is primarily Europe/Ireland, though the remote-delivery model and global customer logos imply cross-border engagement capability.

Name

Defensible

Legal name

Defensible

Website

https://defensible.ie

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

11–50 employees

Short description

Defensible is an Irish information security and Network Reliability Engineering consultancy founded circa 2017, serving multinational enterprises, startups, coworking operators, and schools with principal-led remote consulting (Engage), the PanSift troubleshooting SaaS, and SecViz network visualisation.

Ownership category

akta.pro rank

Headquarters

HQ city

Dublin

HQ country

Ireland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Consulting and Professional Services: Flexible and micro-sliced remote engagement packs with a principal consultant. Minimum half-hourly drawdown for direct consult or live engagement. Supporting or content-related projects may be logged in smaller increments. VAT# IE 3490731JH.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Defensible is an Irish information security, Network Reliability Engineering, and technical marketing consultancy that sells flexible remote consulting engagement packs with principal consultants and operates PanSift, a lightweight agent and SaaS platform for instant remote troubleshooting of network, Wi-Fi, DNS, IPv4, IPv6, and system issues. The firm also provides specialized network and security design, strategy, and framework services for educational institutions and publishes thought leadership on distributed security operations.

Product overview

Defensible is an Irish information security, Network Reliability Engineering, and technical marketing company offering a portfolio of products and services. Their primary SaaS product is PanSift, a remote troubleshooting platform that identifies network, Wi-Fi, DNS, and system issues. They have developed JumpstartSignal.com as an additional application. Defensible Data Viz provides experimental network visualization using RIPE data and Deck.gl. Their Engage service offers flexible remote consulting packs with principal consultants, while their Schools vertical provides network and security services specifically for educational institutions. The company also publishes the 'Beyond The SOC' content series covering security operations concepts and trajectories.

Differentiator

Problem solved

Functional benefit

Brands

• PanSift: Lightweight agent and SaaS platform for instant remote troubleshooting of network, Wi-Fi, DNS, IPv4, IPv6, and system issues.
• Jumpstart Signal
• Network Operator Group (INOG)

Products and services

• Engage Flexible and micro-sliced remote consulting packs with a principal consultant, sold in minimum half-hourly increments with advance scheduling. Targets organizations needing on-demand information security and network reliability engineering support.
• PanSift Lightweight agent and SaaS platform that provides instant remote troubleshooting for technical teams, solving network, Wi-Fi, DNS, IPv4, IPv6, and system issues in seconds.
• Defensible Data Viz (SecViz) An interactive geographic visualization tool that displays RIPE netblock data for IPv4 and IPv6 distributions using Deck.gl rendering.
• Schools Network and security design, strategy, framework, and vendor delivery services tailored for educational institutions.
• Jumpstart Signal Application developed by the Defensible team for job/career signal aggregation and search, operated as an associated sub-brand.

Named customers6 records

Segments3 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• PanSiftcoreTechnology or IntegrationPanSift is an associated product/brand offering lightweight agent and SaaS platform for instant remote troubleshooting of network, Wi-Fi, DNS, IPv4, IPv6, and system issues.

Scale indicators1 record

Recent moves6 records

Expansion highlights4 records

Emerging players

• Thinkst Canary: Thinkst Canary offers a lightweight, self-managed honeypot/honeytoken security tool with a strong developer-first community. Like PanSift, it demonstrates how a small team can ship a focused security product that punches above its weight.

Regional players

• Bridewell Consulting: Bridewell is a UK-based cybersecurity services and consulting firm with overlapping infosec and network advisory offerings. It is comparable on services portfolio but operates primarily in the UK rather than Ireland.

Direct peers

• BH Consulting: BH Consulting is an Ireland-based information security consultancy offering advisory and assessment services to enterprise clients. It overlaps directly with Defensible's independent infosec consulting value proposition in the Irish market.
• Integrity360: Integrity360 is one of Ireland's largest independent cybersecurity consultancies and MSSPs, competing for the same multinational and mid-market Ireland-based security advisory spend that Defensible targets.
• Netbeez: Netbeez sells a lightweight network and Wi-Fi performance monitoring agent plus SaaS dashboard aimed at distributed IT teams. Its scope closely tracks PanSift's 'lightweight agent + SaaS for remote troubleshooting' positioning, making it the most product-comparable peer.
• Obkio: Obkio provides SaaS network performance monitoring with synthetic monitoring agents targeted at MSPs and distributed enterprises. Like Defensible/PanSift, it focuses on simplicity of deployment and remote troubleshooting use cases.
• Ward Solutions: Ward Solutions is an Irish IT security firm providing consulting, managed security, and compliance services to enterprise and public-sector clients, directly competing for Defensible's enterprise infosec engagements.

Broad incumbents

• NCC Group: NCC Group is a UK-listed global cyber security and resilience consultancy. It competes for the same enterprise infosec and network reliability advisory work as Defensible, but at significantly larger scale and broader geographic footprint.
• ExtraHop: ExtraHop is a well-funded network detection and response platform used by large enterprises. It overlaps with Defensible's network reliability engineering consulting and represents the scaled incumbent PanSift ultimately competes against for buyer mindshare.
• Catchpoint: Catchpoint is a venture-backed network observability platform for internet and application performance monitoring. It is the broad incumbent comparable to Defensible's PanSift in terms of target buyer (network/IT operations) and category (remote troubleshooting).

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights5 records

Customer concentration

• Xx.com/makedefensible

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Defensible