TCO Analysis: In-House vs Managed Proxy Infrastructure

When a data engineering team hits a few million requests per day, somebody on the finance side inevitably asks the question: should we just build our own proxy infrastructure? The reasoning is reasonable on its face. Proxy bandwidth on a managed plan lists between $3 and $15 per GB for residential traffic and $0.50 to $3 per GB for ISP, and when you multiply that by real production volumes the monthly invoices are visible on a P&L. Building in-house looks like arbitrage.

This article walks through a three-year total cost of ownership calculation comparing the two options for a workload of 50 TB of monthly residential egress and roughly 200 million requests per day. The numbers here are drawn from published colocation pricing (Equinix, Coresite, Digital Realty public rate cards), transit bandwidth quotes (He.net, Cogent, Lumen), and IPv4 acquisition market data from IPv4.Global and Hilco Streambank auctions.

What "In-House" Actually Means

There is no single definition, so the calculation has to start with scope. A realistic in-house residential proxy operation requires: physical servers, colocation space, network transit, a managed IPv4 allocation (typically /22 or larger), exit node software (Squid, 3proxy, or custom Go/Rust), rotation infrastructure, a billing/metering layer, abuse handling, and at least two engineers who understand BGP and ASN operations. Datacenter and ISP proxies are slightly simpler because you own the IP block outright and announce it yourself. True residential proxies require a supply-side network of real home devices, which is a different business entirely and one we will exclude because buying it from a whitelabel is always cheaper than building it.

We will therefore scope the in-house analysis to ISP proxies, which is the realistic self-build path. ISP proxies are datacenter-hosted IPs that are registered to consumer ISPs via sublease agreements, giving them residential trust scores while running on owned hardware.

Three-Year TCO: In-House ISP Proxy Build

Year 0 capital expenditure

• Hardware: 12 Dell R650 servers at roughly $8,400 each, fully configured with 128 GB RAM and dual 25 GbE NICs. Total: $100,800.
• Switching and routing: Arista 7050X3 top-of-rack plus a pair of Juniper MX204 edge routers for BGP. Roughly $85,000 list, $55,000 discounted.
• IPv4 acquisition: A /20 (4,096 addresses) at the 2025 market rate of $35 to $45 per IP, call it $40. Cost: $163,840. This is the single largest line item and it appreciates as an asset, not a pure expense.
• ASN and RIR fees (ARIN, RIPE, or equivalent): $550 setup plus $1,500 annual. Year 0 portion: $2,050.
• Initial engineering build-out: Two senior network engineers for four months at a $220,000 loaded annual cost. $146,667.

Year 0 capex subtotal: $468,357.

Recurring annual operating cost

• Colocation: Half a rack (20U) with 4 kW power draw, redundant feeds, in an Equinix NY4 or similar Tier III facility. $3,800 per month. Annual: $45,600.
• Transit bandwidth: For 50 TB per month of actual scraping traffic plus overhead, a 10 Gbps committed burstable transit port from a Tier 1 carrier averages $1,200 per month all-in at 2025 pricing. Annual: $14,400. (Note: transit pricing has fallen from $5 per Mbps in 2015 to roughly $0.10 per Mbps in 2025; source: Dr. Peering public reports.)
• Engineering operations: 1.0 FTE steady-state network engineer plus 0.3 FTE software engineer for rotation and control plane maintenance. Loaded cost: $286,000.
• On-call, monitoring, and abuse response: Roughly 0.2 FTE of a SOC analyst plus tooling (PagerDuty, Datadog, abuse ticketing). $68,000.
• IPv4 sublease / ISP partnership fees: To get the residential trust classification, you must sublease the /20 to a consumer ISP and have them announce it. Going rates are $0.80 to $2.00 per IP per month. At the midpoint of $1.40 on 4,096 IPs: $68,813 annually.
• RIR, legal, compliance, insurance: $28,000.

Annual opex: $510,813.

Three-year cumulative in-house TCO

$468,357 (Year 0 capex) + 3 × $510,813 (opex) = $2,000,796.

The IPv4 block retains approximately $163,840 in residual value at the end of year three (and potentially more given continued IPv4 scarcity), so the economic TCO after residual is roughly $1,836,956.

Three-Year TCO: Managed Provider

At 50 TB per month of residential-class traffic, enterprise rate cards from the major managed providers settle between $2.50 and $4.50 per GB after volume discounts. Using the midpoint of $3.40 per GB:

• 50,000 GB × $3.40 = $170,000 per month
• Annual: $2,040,000
• Three-year: $6,120,000

At first glance the in-house build looks 3x cheaper. But this comparison is unfair in both directions, and adjusting it is where the analysis becomes interesting.

Adjustments That Close the Gap

Residential versus ISP trust equivalence

The in-house build produces ISP proxies, not true residential. For many workloads (Google SERP scraping, e-commerce price monitoring, SEO rank tracking), ISP is sufficient or even preferred. But for workloads that require rotating residential IPs across millions of unique consumer endpoints (sneaker releases, ticketing, certain social platforms), no amount of in-house investment will replicate a whitelabel residential network without either buying one or running a consent-based SDK supply network, which is a multi-year regulatory project in itself.

If we re-price the managed comparison at ISP rates rather than residential, the numbers shift dramatically. Enterprise ISP pricing in 2025 is roughly $0.80 to $2.00 per GB. At $1.20 per GB:

• 50,000 GB × $1.20 = $60,000 per month
• Three-year managed ISP: $2,160,000

Now the managed ISP comparison is only $323,044 more expensive over three years than the in-house build. That is a real delta, but it is not the order-of-magnitude arbitrage finance teams expect.

Utilization risk

The in-house model has fixed cost; the managed model is usage-based. If actual monthly volume drops below 40 TB (a 20% miss), the managed provider bill drops proportionally and the in-house bill does not. Conversely, if volume spikes to 80 TB during a peak month, the in-house build chokes on the 10 Gbps port and the managed provider simply bills more. Most data teams forecast volumes poorly in year one.

Opportunity cost of engineering

The 1.3 FTE allocated to the in-house proxy operation could alternatively ship product features. At a typical SaaS company where a senior engineer generates $750,000 to $1.2 million in annual ARR contribution, diverting 1.3 FTE to infrastructure plumbing has a shadow cost of roughly $1 million per year. That alone flips the entire calculation unless scraping is a core product.

Time to live traffic

A managed provider is live in 15 minutes with an API key. The in-house build described above takes four to six months before the first production request. If the business needs data today, the NPV of the managed provider is meaningfully higher.

Decision Framework

The TCO math supports building in-house when all four of the following are true:

1. Monthly bandwidth is consistently above 40 TB and growing.
2. The workload only requires ISP-class trust, not rotating residential.
3. The company already has network engineering in-house (no greenfield hire).
4. Data collection is a core product capability, not a supporting function.

For every other profile, the managed provider wins on adjusted TCO once opportunity cost and time-to-value are included. A reasonable middle path is a hybrid: managed residential for jobs that need rotation diversity, plus a smaller owned ISP block for steady-state high-volume workloads. Hex Proxies supports both profiles and publishes transparent per-GB pricing so teams can model the break-even without asking sales.

Sources

• Dr. Peering International, transit pricing historical reports (drpeering.net).
• IPv4.Global quarterly market reports, 2024-2025.
• ARIN fee schedule (arin.net/resources/fees).
• Equinix and Digital Realty published colocation rate cards, 2025.
• 451 Research, Managed Proxy Market Sizing, 2024.