Observing the Shift from City Center to Suburb
With COVID-19 social distancing measures pushing a large share of the global workforce into home offices, Internet traffic is no longer originating where it used to. Cloudflare's network data shows a pronounced geographic migration of usage away from dense business districts toward residential neighborhoods.
How Cloudflare Measures Traffic Geography
At each of Cloudflare's edge locations in over 200 cities, routers sample IP packet data for every connection they handle. These flow records capture layer-3 details — source and destination IPs, ports, packet sizes — which are then matched against a geolocation database like Maxmind to estimate each request's origin. Imprecise location records are discarded to reduce noise, and the remaining data is aggregated by area to produce a global traffic distribution map.
Heatmaps Reveal the Migration
A direct comparison of daytime Internet traffic in New York City on February 19 and March 18 shows measurable erosion of volume in the urban core over those four weeks.
February 19, 2020
March 18, 2020
Plotting a differential heatmap of the two dates makes the pattern unmistakable:
The visualization subtracts the earlier baseline from the later date; red indicates areas where usage decreased and green marks where it increased between the two Wednesdays. Changes are measured during working hours (1000–1600 local time), isolating the work-from-home effect from evening or overnight patterns. The result is a clear picture of demand shifting toward suburban residential zones.
Similar Patterns in Other Metro Areas
Cloudflare generated the same before-and-after comparisons for other affected cities, and each follows the same trend.
Seattle, US
The Seattle map captures ancillary effects beyond home-office migration: the red mark around Silverdale corresponds to the closed Kitsap Mall, and Sea-Tac Airport appears as a red zone between Burien and Renton.
San Francisco Bay Area, US
The Bay Area chart clearly shows reduced demand where large Silicon Valley firms have sent staff home to work.
Paris, France
In Paris, the airport at Le Bourget and its surrounding industrial district show a red decline in the northeast, while Versailles appears red to the west.
Berlin, Germany
Berlin's chart highlights a red spot near Tegeler See — Flughafen Berlin-Tegel — consistent with a steep drop in airport traffic.
Beyond the Geographic Picture
This geographic rebalancing is not happening in isolation. Overall traffic volume in the monitored metropolitan areas rose between 10% and 40% during the same four-week window, as more people moved their daily activities onto residential connections. The Internet's original design brief — a reliable communications network for times of crisis — is exactly what it is being asked to do again now, at a scale its architects never anticipated. Cloudflare is keeping its own operations running through the period of elevated load, and has made its Teams products available free for companies supporting employees working from home.
