What is backlink monitoring

Definition

Backlink monitoring is a repeated check of a known list of links. The input is a set of pairs: a source URL (the page on someone else's site that carries the link) and a target URL (the page on your site the link should point to). On each run, a monitor downloads the source page, looks for an anchor element whose href resolves to the target, and records the conditions around that link.

The goal is not to discover new links. It is to confirm that links you already earned, bought or negotiated are still doing the job they were placed to do, and to notice quickly when one stops.

Why links need re-checking

A link on a third-party site is outside the buyer's control from the moment it is published. Over months, source pages change for ordinary reasons: editors rewrite articles, content management systems are migrated, sites are sold, old posts are pruned, and paid placements are quietly relabelled. Each of those changes can remove the link or reduce what it passes.

Some changes are visible only in the HTML. A link can remain on the page while gaining rel="nofollow", or the whole page can gain a noindex rule that Google honours on its next crawl. Google's documentation states that when Googlebot extracts a noindex rule it drops the page from search results regardless of who links to it. A link on such a page still renders for visitors but sits on a page Google no longer shows. A human glancing at the page would see nothing wrong.

What a monitor checks

A complete run evaluates the link against the conditions listed on the backlink health checks page. In summary:

Each check produces a fact about the page at the moment of the run. The monitor's value comes from comparing those facts with the previous run and with what was agreed when the link was placed.

Monitoring versus discovery tools

Third-party backlink databases crawl the web on their own schedule and report links they have found. They are useful for discovering links you did not know about, but they may revisit a given page infrequently, and they cannot tell you about conditions they do not record. A monitor works the other way round: it starts from a list you supply and fetches each page on your schedule. The comparison of monitoring and databases goes into the trade-offs.

Outcomes and follow-up

A run usually ends in one of two kinds of result. Either the check completed and the link was found to be healthy, missing, blocked by robots.txt or not indexable, or the check could not complete because the page was unreachable, refused automated requests or returned something the parser could not read. The second group is not evidence that the link is gone. The outcome codes reference lists the labels and how to act on each.

When a link is confirmed missing, the next steps are to find out why it went missing and, where the placement was paid, contact the publisher. The recovery guide covers that process.

Cadence

How often to run checks is a cost and risk decision. Recently placed and expensive links justify frequent checks, because a problem caught soon after publication is easier to raise and a refund or replacement is easier to negotiate early. Older, stable links can move to monthly or quarterly runs. The cadence page sets out the options.

Tools

Monitoring can be done by hand for a handful of links: open the page, view the source, search for the target URL and read the surrounding attributes. Beyond a few dozen links, a scheduled tool is more reliable. This handbook is published by IndexChex, whose backlink monitor runs the six checks above on one-time or recurring schedules. Other SEO platforms offer link tracking with different check sets, so it is worth confirming which conditions a given tool actually records before relying on it.