How ByteDance Powers Billions with Multi‑Terabit Data Center Bandwidth

ByteDance, Douyin, Baidu, Alibaba Cloud and Tencent all run self‑built data centers with total outbound bandwidth at the T‑level (1 TB = 1024 Gb/s), and server fleets typically exceeding 200 k, with Alibaba Cloud surpassing one million servers.

ByteDance’s data center total bandwidth may be around 10 TB, with expectations to break 15 TB soon.

In practice, a total outbound bandwidth of 1 TB often translates to a physical data‑center egress of about 100 Gb, achieved through dual‑link designs that aggregate multiple links to reach the terabit scale.

To support hundreds of millions of simultaneous users, TB‑level bandwidth, CDN acceleration, multi‑node deployment and load‑balancing are indispensable.

How many servers does ByteDance have?

According to public data, ByteDance had 20‑30 k servers in early 2017 (mostly rented). In 2018 it built its own data center in Hebei’s Huailai Guan‑ting Lake media park: Phase 1 with 50 k servers, Phase 2 with 90 k servers. By the end of 2018, rented plus self‑built servers reached 170 k, and in 2020 recruitment data indicated about 420 k servers.

These servers primarily serve Chinese‑region products such as Douyin, Kuaishou Video, Toutiao and Feishu. TikTok’s U.S. operations run independently with data stored and delivered locally.

2020 TikTok U.S. data‑center capacity

Business Insider reported that in early 2020 ByteDance rented a data center in northern Virginia with a power capacity of 53 MW, capable of housing hundreds of thousands of servers and covering tens of thousands of square feet.

ByteDance also invests in data centers in India and Singapore.

What is the outbound bandwidth of ByteDance’s large data centers?

Outbound bandwidth is essentially the download bandwidth experienced by end users – the total speed at which servers deliver data to devices. Small IDC‑owned data centers often have total egress of only 5 Gb; exceeding 30 Gb typically indicates a sizable enterprise.

Many medium‑size enterprises now prefer cloud hosts (Alibaba Cloud ECS, Tencent Cloud, Baidu Cloud, AWS) over building their own facilities. A typical corporate website might run on 20 Mb bandwidth, 4 GB RAM and 100 GB storage for a yearly cost of 4,000‑5,000 CNY.

China Mobile’s Shijiazhuang data center occupies 174 mu (≈11.6 ha) with 130 000 m² floor space, 10 buildings, 30 000 rack units and 15 Tb of bandwidth, supporting roughly 210‑360 k servers (estimated 300 k). This suggests ByteDance’s self‑built 170 k‑server data center could provide 7‑10 Tb of total outbound bandwidth, using dual‑exit and multi‑link designs to achieve effective egress of 800 Gb‑1 Tb while presenting a 10 Tb aggregate.

For context, Tencent’s 2015 CDN handled 5 × 10¹¹ requests daily with 10 Tb of bandwidth.

CDN acceleration makes Douyin video playback smooth

CDN (Content Delivery Network) pushes content to edge nodes closest to users, reducing latency and alleviating Internet congestion. Static pages are compressed and served directly, allowing users to see content within 2 seconds. Dynamic video streams use intelligent routing, protocol optimization, long‑connection handling and compression to eliminate redundancy.

Given Douyin’s 600 million daily active users and additional 200 million from Kuaishou Video and Toutiao, a total bandwidth of around 10 Tb is a reasonable estimate to sustain such traffic.