Every host your team is on the hook for

A few people own the websites, APIs, VPN endpoints, mail servers and office link that keep the business running, with no dedicated on-call rota and no enterprise monitoring budget. hostnag watches all of it from the cloud and tells the right person before a customer notices.

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The plan that fits: Pro.

What IT teams watch
What breaks	hostnag
A host goes downwebsite, API, VPN, mail, gateway	Yes
A certificate expiresdays-before thresholds, daily inside the last window	Yes
A domain lapsesregistration expiry from RDAP	Yes
An ISP link dropsthe public address from several locations, by ping or a TCP port, confirmed by a ping from an internal device	Yesexternal and internal
hostnag: external and internal
Mail stops being deliveredMX, SPF, DKIM, DMARC and blocklists, at the expiry cadence of your plan	Yes

The board

The overview over sample data. Press LAMP TEST; switch the view.

Active06

Alarm: 01
Supervisory: 02
Trouble: 00
Normal: 03
Unlit: 00

View

Acme Retail

06Sample data

DownHTTP

Checkout API

api.acme.example/health

Down47 min

checked 1 min ago

Expiring soonCert

mail.example.com

11d left10 Oct 2026

checked 40 min ago

UpTCP

VPN gateway

vpn.office.example

31ms

checked 2 min ago

OKDomain

example.com

40d left08 Nov 2026

checked 9 h ago

UpDNS

MX example.com

example.com

18ms

checked 4 min ago

DegradedHTTP

Storefront

shop.acme.example

1840msslow for 22 min

checked 1 min ago

How it is set up

01
Add every host with an address
Websites, APIs, VPN endpoints, mail servers and the office link. hostnag watches each one from the cloud, and nothing runs on the host itself.
02
Group them the way the team already splits the work
One group per site, or one group for everything the on-call person owns; each group carries its own alert policy.
03
Route alerts to the channel the team already watches
Email on every plan, plus Slack, Discord, Teams, Telegram or a webhook once the team is on a plan that includes them, each with its own minimum severity.
04
Add quiet hours before the first 3 a.m. alert
A policy can stay quiet on its own schedule, so a non-critical alert waits for the morning instead of waking whoever is on call.

The plan that fits

Monitors: 100
More monitors: Up to 4 packs of 100
Groups: 25
Seats: 10
Locations: 3
Fastest interval: 1 min
Channels: Email, Slack, Discord, Microsoft Teams, Telegram, Webhook, PagerDuty, Opsgenie
History: 90 days
Reports: 3 months
Scoped viewers: Yes

Questions

Do we need a dedicated person to run this?

No. hostnag runs from the cloud with nothing to install; adding a host and a channel is two short forms.

Can we watch something that isn't a website, like our VPN gateway?

Yes, as a TCP monitor: a host and a port. A private or loopback address is refused since hostnag watches from the internet; a host it cannot reach can report its own status instead through a status report URL.

Features that matter

Uptime monitoringWebsites, APIs and anything that answers on a port, checked every minute from up to five places, with a failure confirmed before anyone is paged.Certificate monitoringEvery certificate hostnag can reach is watched for expiry, a swapped chain and a renewal that should already have happened; the ones it cannot reach get a URL to report to instead.Domain monitoringEvery domain's registration watched for lapsing, a registry hold or a blocked renewal, plus whether its nameservers answer for it and agree, and whether its DNSSEC signatures are still fresh.Mail health monitoringThe records that keep mail deliverable, plus up to 8 sending addresses checked against the blocklists that get mail rejected.Link monitoringAn office or ISP connection watched from both ends, so a filtered port and a dead line never read the same.Discovery and subdomain watchEvery name under a domain, found in its own DNS, its homepage and the names people usually use, each judged live, gone or pointing nowhere, with the ones anyone could claim listed first. A subdomain watch looks again every day and alerts on what changed.

Add a host. Hear about it first.

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