What is Run of Network (RON)?
Run of Network (RON) is a media buying model in which a network distributes an advertiser’s ads across all available inventory within that network, with no restrictions on which specific sites, sections, or placements receive the impressions. The network’s algorithm decides where ads appear. In exchange for surrendering placement control, advertisers typically receive significantly lower CPMs than targeted or reserved buys.
How Run of Network Works
When an advertiser selects RON, the ad network pools all unsold or remnant inventory across its publisher partners and fills it with that advertiser’s creative. There is no site list, no category exclusion (unless explicitly added), and no audience filter. The network optimizes delivery toward impressions that are likely to meet the campaign’s basic performance goals, whether that means clicks, completions, or simply filling the contracted volume.
Advertisers execute RON buys either directly with a network or through programmatic advertising platforms, where real-time bidding can simulate RON-style broad delivery at scale. In both cases, the defining characteristic is the absence of placement-level targeting.
RON vs. Run of Site vs. Targeted Buys
| Buy Type | Placement Control | Typical CPM Range | Best Use |
|---|---|---|---|
| Run of Network (RON) | None | $0.50 – $3.00 | Reach, frequency, awareness at low cost |
| Run of Site (ROS) | Publisher-level only | $2.00 – $8.00 | Brand-aligned publisher with broad inventory |
| Targeted / Reserved | Full (section, audience, placement) | $8.00 – $40.00+ | High-intent audiences, brand safety priority |
The CPM gap between RON and targeted inventory can be 10x or more, which is why performance marketers use RON as a volume lever when budget efficiency matters more than audience precision.
Calculating RON Value
Evaluating a RON buy requires comparing effective cost per outcome against targeted alternatives.
Effective CPM formula:
eCPM = (Total Spend / Total Impressions) × 1,000
Cost per click comparison example:
- RON buy: $5,000 budget at $1.50 CPM = 3,333,333 impressions. If CTR is 0.05%, that yields 1,667 clicks. CPC = $3.00.
- Targeted buy: $5,000 budget at $12.00 CPM = 416,667 impressions. If CTR is 0.25%, that yields 1,042 clicks. CPC = $4.80.
In this scenario, RON delivers a lower CPC despite a lower click-through rate, because the volume advantage offsets the weaker audience match. This arithmetic does not always favor RON, but it illustrates why the model persists in performance media plans.
When Advertisers Use RON
Awareness and Reach Campaigns
Brands with broad consumer audiences and high-recognition products, such as fast-moving consumer goods or national retail chains, use RON to accumulate impressions at scale. A retailer running a Black Friday campaign may purchase hundreds of millions of RON impressions to maximize reach during a compressed window, accepting that some placements will be irrelevant in exchange for volume and low CPM.
Retargeting Pools
Some advertisers use RON inventory to serve retargeting ads to cookied audiences. Because the advertiser applies audience targeting at their own level rather than the placement level, the ad can follow a user across RON inventory while still maintaining audience relevance. This approach keeps retargeting costs low without sacrificing the audience match.
Testing Creative Performance
RON buys expose creative to a high volume of varied contexts quickly. Marketers run A/B tests across RON inventory to identify which ad variants generate the strongest engagement before committing budget to premium placements. The cost per data point is lower than on targeted inventory.
Brand Safety Risks
The primary risk in RON buying is brand safety. Without placement controls, ads may appear alongside low-quality, controversial, or inappropriate content. A household brand’s display ad appearing on a misinformation site or adult content publisher is a common RON failure case.
In 2017, major advertisers including AT&T and Johnson & Johnson pulled YouTube spend after ads surfaced alongside extremist content, an incident that accelerated adoption of brand safety tools and category exclusion lists. While YouTube was not a pure RON buy, the episode illustrated what unmanaged network distribution can produce.
Standard mitigation practices include:
- Applying industry-standard blocklists (GARM, IAS, DoubleVerify) to exclude unsafe categories
- Setting viewability thresholds to filter low-quality placements
- Monitoring post-campaign placement reports and blacklisting recurring poor performers
- Using contextual targeting layers that exclude specific content categories even within a RON framework
RON in Programmatic Contexts
In programmatic advertising, open auction buying with minimal targeting parameters approximates RON behavior. An advertiser sets a low bid floor, broad geo and language targeting, and lets the demand-side platform (DSP) bid across all available supply. The result resembles traditional RON: high volume, low CPM, diverse placements.
Programmatic RON gives advertisers more detailed post-buy data than traditional network buys, including domain-level performance reports, making it easier to identify which portions of the buy delivered value and which should be suppressed on future flights.
RON Performance Benchmarks
Performance varies widely by vertical, creative format, and network quality. General display benchmarks from industry sources including the Interactive Advertising Bureau (IAB) suggest:
- Average display CTR on open/RON inventory: 0.035% – 0.10%
- Viewability rates on RON display: 40% – 55% (compared to 60%+ on premium/reserved)
- CPM range for RON display: $0.50 – $3.00 in open auction conditions
These benchmarks are averages. Verticals with high advertiser demand, such as financial services or automotive, may see higher floor prices even on RON inventory due to competitive bidding pressure.
Key Takeaways
- RON trades placement control for lower CPMs and higher impression volume.
- It suits awareness campaigns, creative testing, and retargeting overlays where cost efficiency outweighs placement precision.
- Brand safety management through blocklists and category exclusions is not optional on RON buys.
- Programmatic open auction buying functions as the modern equivalent of traditional RON, with better post-buy reporting.
- RON works best as one layer in a mixed media plan, not as a standalone strategy for high-value conversions.
Frequently Asked Questions
What does Run of Network (RON) mean in advertising?
Run of Network (RON) is a media buying model where an advertiser’s ads run across all available inventory in an ad network, with no restrictions on specific sites or placements. The network’s algorithm controls distribution, and advertisers pay significantly lower CPMs than on targeted or reserved buys, typically $0.50 – $3.00 for display.
What is the difference between RON and Run of Site?
Run of Network distributes ads across all publisher partners within a network, with no publisher-level control. Run of Site limits distribution to a single publisher’s full inventory. ROS offers more brand alignment at a higher CPM, typically $2 – $8, compared to RON’s $0.50 – $3.00 range.
Is RON buying risky for brand safety?
RON buying carries real brand safety risk because ads can appear on any site within the network, including low-quality or inappropriate content. Advertisers manage this with blocklists from providers such as IAS and DoubleVerify, viewability thresholds, and category exclusion lists. Without these controls, RON is not suitable for brand-sensitive campaigns.
What CTR should I expect from a RON campaign?
Display CTR on RON and open-auction inventory averages between 0.035% and 0.10%, according to Interactive Advertising Bureau benchmarks. This is lower than premium or targeted inventory, but the low CPM ($0.50 – $3.00) often offsets the weaker click rate for campaigns focused on volume or awareness.
How does programmatic advertising relate to RON?
Programmatic open auction buying is the modern equivalent of traditional RON. An advertiser sets a low bid floor and minimal targeting, and the demand-side platform (DSP) bids across all available supply. The key difference is that programmatic RON provides domain-level performance data, making it easier to optimize and suppress poor placements over time.