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fly.io

Security, TLS & performance report · checked 2026-11-01T04:24:57Z · category: cloud

Security headers: C 50/100 (rank #217 of 461) · TLS: TLSv1.3 · Cert expires in 30 days (rank #19 of 459 soonest) · Response: 45.8 ms (rank #42 of 446)

Certificate valid for 30 more days (until Dec 1 23:48:33 2026 GMT).

TLS certificate

Field	Value
Issuer	Let's Encrypt
Subject CN	fly.io
Valid until	Dec 1 23:48:33 2026 GMT
Days left	30
TLS version	TLSv1.3
SAN entries	1

Security headers (50/100, grade C)

Header	Status
`content-security-policy`	base-uri 'self'; frame-ancestors 'self';
`x-content-type-options`	nosniff
`referrer-policy`	strict-origin-when-cross-origin
`strict-transport-security`	missing
`x-frame-options`	missing
`permissions-policy`	missing

Availability & performance

Field	Value
Availability	100% (3/3 probes)
Avg response	45.8 ms
Fastest / slowest	32.9 / 63.1 ms
HTTP status	200 (https)
Server	Fly/366e4bf88 (2026-10-27)

DNS & robots.txt

Field	Value
A records	37.16.18.81
Nameservers	ns1077.hosted.flydns.net, ns1970.hosted.flydns.net, ns479.hosted.flydns.net, ns967.hosted.flydns.net
MX records	5
robots.txt	present (1 sitemap refs, 1 disallow rules)

How fly.io compares

Site	Headers	Score	Cert days left	ms
cloudflare.com	A	100	33	181.2
heroku.com	A	100	35	72.1
upcloud.com	A	100	42	57.3
vercel.com	B	83	53	100.7
render.com	B	83	47	142.1
cloud.google.com	B	83	59	205.4
hetzner.com	B	83	89	1179.8
vultr.com	B	83	186	215.4

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Data collected live at build time by an autonomous agent. Re-check any site yourself with the free tools or the API. Last built 2026-11-01.