IPv4 routing table hits 1.06M prefixes as Amazon expands footprint

The sustained growth beyond the 1-million prefix threshold directly impacts the forwarding information base (FIB) limits of older hardware. For streaming providers relying on precise traffic engineering, the high volume of 'more specific' routes (sub-allocations of larger blocks) ensures granular routing but increases global BGP churn. As operators like Amazon continue to advertise thousands of fragmented prefixes, network engineers must monitor router TCAM capacity to avoid silent packet drops. The ecosystem's reliance on IPv4 persists despite these scaling challenges, necessitating active CIDR aggregation to preserve backbone stability.

The global IPv4 routing table officially crossed the critical 1-million prefix milestone in November 2025, per InterLIR and RIPE Labs reporting. This threshold is technically significant because many legacy backbone routers were historically manufactured with hardware memory limits (TCAM) specifically tested at or near 1 million routes. Surpassing this volume risks '1024k' events, similar to the 512k disruption in 2014, where under-resourced hardware can suffer catastrophic forwarding failures or routing loops when unable to store the full global table.

Amazon's role in this expansion intensified in December 2024 when AS16509 began announcing over 1,000 new super-aggregate prefixes covering nearly all of AWS’s assigned IP space. Per Kentik, this move was partly a security measure to prevent BGP hijacking by ensuring all valid IP space carried a signed Route Origin Authorization (ROA). However, as APNIC’s Geoff Huston noted in January 2026, while address span growth has stabilized, the number of individual prefix entries continues to rise as operators use more specific advertisements for granular traffic engineering and load balancing across CDNs.

Despite the growth of IPv6—which reached a landmark 50.1% of Google's global traffic in March 2026 according to internal measurement data—IPv4 remains the dominant protocol for enterprise and streaming infrastructure. Per APNIC reporting in March 2026, IPv4 still accounts for over 60% of total global traffic due to legacy compatibility requirements. The marketplace rarity of IPv4 addresses has also driven prices upward, with single addresses trading between $50 and $65 as of mid-2026. This financial value incentivizes owners to announce every fragmented block they own, further contributing to the routing table's density.