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Routing Table Memory Calculator

Estimate routing table memory and TCAM requirements

Total number of route prefixes in the routing table. Internet full table is ~950K+ IPv4 routes. Internal networks typically have hundreds to thousands.
Average CIDR prefix length. Internet average is ~24 for IPv4. Longer prefixes require more TCAM entries in some architectures.
/ bits
Memory consumed per route entry. Varies by platform: simple RIB entry ~64 bytes, with multiple attributes/next-hops can be 128-256 bytes.
bytes
Number of Equal-Cost Multi-Path next-hops per route. Each ECMP path adds a next-hop entry. Typical values: 1-16.

Memory Results

Total Route Entries
Total with ECMP Next-Hops
RIB Memory (Software)
TCAM Entries Needed
TCAM Memory Estimate
Lookup Performance
Internet Table Comparison
References:
Internet IPv4 full table: ~950,000+ prefixes (2025)
Internet IPv6 full table: ~200,000+ prefixes
TCAM entry: typically 40-80 bytes for hardware forwarding