Trust Flow
Link Quality
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Citation Flow
Link Volume


In the last 90 days In the last 5 years

Fresh - External


Incoming links from other websites, excludes supplemental

Fresh - Referring

100K - 500K

Unique domains linking to this site. Breakdown

Fresh - Referring


Unique IPs hosting referring domains

Fresh - Referring


Unique Class-C subnets

Historic - External


Incoming links from other websites

Subscribers get Referring Domain, IP and Subnet values for all websites, and Pro+ accounts get Historic Index Plans & Pricing

Outbound Links

7 Internal
0 External
7 Total Outlinks
0 Ext Domains
(Average per Crawled Page)


Crawled URLs 55,912
Indexed URLs 1,908,579
Educational Ref. Backlinks 975,682
Governmental Ref. Backlinks 313,853
Educational Ref. Domains 3,729
Governmental Ref. Domains 944
IP Address

Link Profile

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A report of the detected language for each page on this domain, and the languages of incoming anchor texts.

Incoming Languages

67,406,937 checked backlinks

  •   68.2% en English
  •    5.3% de German
  •    5.2% fr French
  •    2.6% it Italian
  •    2.6% ru Russian
  •    2.5% cs Czech
  •    2.1% es Spanish/Castilian
  •    2% tr Turkish
  •    1.3% ja Japanese
  •    1.2% th Thai
  •    7.0% OTH Other

Site Languages

18,205 language-detected crawled URLs

  •   99.7% en English

Topical Trust Flow

A measure of how close you are to the most trusted websites in almost one thousand categories.

Topical Trust Flow is available on all websites, to all subscribers, even on our lowest-price plan.

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Referring Domains Breakdown

Referring Domains

This chart shows the number of Referring Domains reviewed every day.

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Anchor Text

See more results on the Anchor Text tab, where you can drill down into each keyword and find the Referring Domains and External Backlinks that use that Keyword.

# Anchor Text Referring Domains External Backlinks
Total Deleted NoFollow
1 nasa Subscribe
4,958,987 69,323 309,953
2 here Subscribe
114,989 3,734 5,449
3 astronomy picture of the day Subscribe
742,024 17,696 25,862
4 Subscribe
53,762 1,817 4,604
5 nasa tv Subscribe
115,130 14,928 22,717
6 international space station Subscribe
34,189 1,594 2,847
7 Subscribe
129,755 3,412 5,742
8 the original Subscribe
7,957 122 7,812
9 jet propulsion laboratory Subscribe
42,806 1,249 902

The above chart may have cropped text due to size restrictions, for full details visit the Anchor Text tab. We explain how this is created in the FAQs.

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