Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

59 hosts · 433 ms

HostCertsFirst seenLast seenDNS
a2gov.org 14 2026-05-31 2026-09-28 ok
*.a2gov.org 9 2026-02-17 2026-09-26 —
aaaincaseofemergency1.a2gov.org 5 2026-06-06 2026-10-04 ok
www2.a2gov.org 8 2026-05-07 2026-09-02 ok
aaaincaseofemergency2.a2gov.org 5 2026-06-06 2026-10-04 ok
give365.a2gov.org 5 2026-06-06 2026-10-04 ok
leica.a2gov.org 5 2026-05-07 2026-09-06 ok
data.a2gov.org 5 2026-04-22 2026-08-24 ok
waterdata.a2gov.org 8 2026-04-20 2026-08-17 ok
a2mapssec.a2gov.org 15 2026-04-11 2026-10-06 ok
chattkt-public.a2gov.org 2 2026-08-05 2026-08-05 nxdomain
a2mapspublic.a2gov.org 10 2026-05-11 2026-09-06 ok
fdd.a2gov.org 8 2026-05-16 2026-09-12 ok
telestafffd.a2gov.org 5 2026-05-08 2026-09-03 ok
aapd.a2gov.org 5 2026-05-09 2026-09-04 ok
telestaffpd.a2gov.org 5 2026-05-11 2026-09-07 ok
engage.a2gov.org 6 2026-06-08 2026-10-06 ok
www.engage.a2gov.org 6 2026-06-08 2026-10-06 ok
secure.a2gov.org 8 2026-05-07 2026-09-02 ok
crashresponse.a2gov.org 2 2026-08-18 2026-08-18 ok
a2mapseg.a2gov.org 7 2026-08-05 2026-10-03 ok
housing.a2gov.org 10 2026-04-22 2026-08-18 ok
osi.a2gov.org 5 2026-05-09 2026-09-04 ok
a2openbook.a2gov.org 4 2026-04-12 2026-08-08 ok
a2central.a2gov.org 5 2026-06-06 2026-10-04 ok
voicemail.a2gov.org 5 2026-06-06 2026-10-04 ok
url.a2gov.org 4 2026-04-18 2026-08-14 ok
stream.a2gov.org 8 2026-05-12 2026-09-08 ok
ckan.a2gov.org 5 2026-05-03 2026-09-25 ok
plan.a2gov.org 5 2026-06-06 2026-10-04 ok
ctn.a2gov.org 5 2026-05-09 2026-09-04 ok
ctnvideo.a2gov.org 15 2026-06-04 2026-10-01 ok
a2geo.a2gov.org 10 2026-05-05 2026-08-31 ok
streetsweepingmap.a2gov.org 5 2026-05-18 2026-09-15 ok
snowplowmap.a2gov.org 5 2026-05-15 2026-09-12 ok
nap.a2gov.org 4 2026-04-18 2026-08-14 ok
calendar.a2gov.org 5 2026-06-06 2026-10-04 ok
volunteer.a2gov.org 5 2026-05-22 2026-09-17 ok
treetracker.a2gov.org 11 2026-05-19 2026-09-15 ok
water.a2gov.org 10 2026-05-16 2026-09-11 ok
mainsaver.a2gov.org 10 2026-04-19 2026-08-15 ok
hr.a2gov.org 5 2026-06-06 2026-10-04 ok
vendor.a2gov.org 8 2026-04-29 2026-08-25 ok
analytics.a2gov.org 6 2026-05-16 2026-09-11 ok
10ktrees.a2gov.org 5 2026-04-29 2026-08-25 ok
a2cityworks.a2gov.org 6 2026-05-07 2026-09-02 ok
forms.a2gov.org 6 2026-05-14 2026-09-02 ok
jobdescriptions.a2gov.org 2 2026-09-25 2026-09-25 ok
a2maps.a2gov.org 9 2026-05-28 2026-09-23 ok
mta-sts.a2gov.org 5 2026-04-29 2026-08-27 ok
etrakit.a2gov.org 5 2026-04-23 2026-08-19 ok
greenbelt.a2gov.org 4 2026-04-18 2026-08-14 ok
streamtest.a2gov.org 11 2026-05-29 2026-09-24 ok
vendortest.a2gov.org 8 2026-04-16 2026-08-12 ok
a2mapstest.a2gov.org 4 2026-05-07 2026-07-05 nxdomain
a2geocw.a2gov.org 10 2026-04-21 2026-08-17 ok
a2mapscw.a2gov.org 10 2026-05-04 2026-08-30 ok
telestaffww.a2gov.org 5 2026-05-08 2026-09-03 ok
www.a2gov.org 2 2026-01-13 2026-06-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/a2gov.org (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/a2gov.org.