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MTU and MSS Calculator

Versioned overhead table for VLAN, PPPoE, GRE, VXLAN, WireGuard, IPsec.
Inner IPv4Inner IPv6No encapsulation802.1Q VLANQinQ (802.1ad)PPPoEGRE (basic)VXLAN over outer IPv4 + UDPVXLAN over outer IPv6 + UDPWireGuard over outer IPv4WireGuard over outer IPv6IPsec transport, AES-CBC + HMAC-SHA1IPsec tunnel, AES-CBC + HMAC-SHA1MTU (bytes)

68-65535; the overhead table version ships with every result.
Overhead0 BInner IP payload1480 BTCP MSS1460 BUDP payload max1472 B

Bare IP on the wire.

Inner IPv 4 header ( 20 B) + TCP header (20 B) are subtracted for MSS; every layer states its own byte cost above.
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Next door in Network

- Bandwidth calculator (/network/bandwidth)
- CIDR Overlap Check (/network/cidr-check)
All network tools (/network)

Canonical HTML: https://nutter.tools/network/mtu
Markdown version: https://nutter.tools/network/mtu/index.md
Plain-text version: https://nutter.tools/network/mtu/index.txt
Agent index: https://nutter.tools/llms.txt