目前預留的 50 到 999 之間的 UID。
bind:*:53:53:Bind Sandbox:/:/sbin/nologin
majordom:*:54:54:Majordomo Pseudo User:/usr/local/majordomo:/nonexistent
rdfdb:*:55:55:rdfDB Daemon:/var/db/rdfdb:/bin/sh
spamd:*:58:58:SpamAssassin user:/var/spool/spamd:/sbin/nologin
cyrus:*:60:60:the cyrus mail server:/nonexistent:/nonexistent
gnats:*:61:1:GNATS database owner:/usr/local/share/gnats/gnats-db:/bin/sh
proxy:*:62:62:Packet Filter pseudo-user:/nonexistent:/nonexistent
uucp:*:66:66:UUCP pseudo-user:/var/spool/uucppublic:/usr/libexec/uucp/uucico
xten:*:67:67:X-10 daemon:/usr/local/xten:/nonexistent
pop:*:68:6:Post Office Owner (popper):/nonexistent:/sbin/nologin
wnn:*:69:7:Wnn:/nonexistent:/nonexistent
pgsql:*:70:70:PostgreSQL pseudo-user:/usr/local/pgsql:/bin/sh
oracle:*:71:71::0:0:Oracle:/usr/local/oracle7:/sbin/nologin
ircd:*:72:72:IRC daemon:/nonexistent:/nonexistent
ircservices:*:73:73:IRC services:/nonexistent:/nonexistent
simscan:*:74:74:Simscan User:/nonexistent:/sbin/nologin
ifmail:*:75:66:Ifmail user:/nonexistent:/nonexistent
www:*:80:80:World Wide Web Owner:/nonexistent:/sbin/nologin
alias:*:81:81:QMail user:/var/qmail/alias:/nonexistent
qmaild:*:82:81:QMail user:/var/qmail:/nonexistent
qmaill:*:83:81:QMail user:/var/qmail:/nonexistent
qmailp:*:84:81:QMail user:/var/qmail:/nonexistent
qmailq:*:85:82:QMail user:/var/qmail:/nonexistent
qmailr:*:86:82:QMail user:/var/qmail:/nonexistent
qmails:*:87:82:QMail user:/var/qmail:/nonexistent
mysql:*:88:88:MySQL Daemon:/var/db/mysql:/sbin/nologin
vpopmail:*:89:89:VPop Mail User:/usr/local/vpopmail:/nonexistent
firebird:*:90:90:Firebird Database Administrator:/usr/local/firebird:/bin/sh
mailman:*:91:91:Mailman User:/usr/local/mailman:/sbin/nologin
gdm:*:92:92:GDM Sandbox:/:/sbin/nologin
jabber:*:93:93:Jabber Daemon:/nonexistent:/nonexistent
p4admin:*:94:94:Perforce admin:/usr/local/perforce:/sbin/nologin
interch:*:95:95:Interchange user:/usr/local/interchange:/sbin/nologin
squeuer:*:96:96:SQueuer Owner:/nonexistent:/bin/sh
mud:*:97:97:MUD Owner:/nonexistent:/bin/sh
msql:*:98:98:mSQL-2 pseudo-user:/var/db/msqldb:/bin/sh
rscsi:*:99:99:Remote SCSI:/usr/local/rscsi:/usr/local/sbin/rscsi
squid:*:100:100:squid caching-proxy pseudo user:/usr/local/squid:/sbin/nologin
quagga:*:101:101:Quagga route daemon pseudo user:/usr/local/etc/quagga:/sbin/nologin
ganglia:*:102:102:Ganglia User:/nonexistent:/sbin/nologin
sgeadmin:*:103:103:Sun Grid Engine Admin:/nonexistent:/sbin/nologin
slimserv:*:104:104:Slim Devices SlimServer pseudo-user:/nonexistent:/sbin/nologin
dnetc:*:105:105:distributed.net client and proxy pseudo-user:/nonexistent:/sbin/nologin
clamav:*:106:106:Clamav Antivirus:/nonexistent:/sbin/nologin
cacti:*:107:107:Cacti Sandbox:/nonexistent:/sbin/nologin
webkit:*:108:108:WebKit Default User:/usr/local/www/webkit:/bin/sh
quickml:*:109:109:quickml Server:/nonexistent:/sbin/nologin
vscan:*:110:110:Scanning Virus Account:/var/amavis:/bin/sh
fido:*:111:111:Fido System:/usr/local/fido:/bin/sh
dcc:*:112:112:Distributed Checksum Clearinghouse:/nonexistent:/sbin/nologin
amavis:*:113:113:Amavis-stats Account:/nonexistent:/sbin/nologin
dhis:*:114:114:DHIS Daemon:/nonexistent:/sbin/nologin
_symon:*:115:115:Symon Account:/var/empty:/sbin/nologin
postfix:*:125:125:Postfix Mail System:/var/spool/postfix:/sbin/nologin
rbldns:*:153:153:rbldnsd pseudo-user:/nonexistent:/sbin/nologin
sfs:*:171:171:Self-Certifying File System:/nonexistent:/sbin/nologin
agk:*:172:172:AquaGateKeeper:/nonexistent:/nonexistent
polipo:*:173:173:polipo web cache:/nonexistent:/sbin/nologin
bogomilter:*:174:174:milter-bogom:/nonexistent:/sbin/nologin
moinmoin:*:192:192:MoinMoin User:/nonexistent:/sbin/nologin
sympa:*:200:200:Sympa Owner:/nonexistent:/sbin/nologin
dspam:*:202:202:Dspam:/nonexistent:/sbin/nologin
_tor:*:256:256:Tor anonymising router:/var/db/tor:/bin/sh
ldap:*:389:389:OpenLDAP Server:/nonexistent:/sbin/nologin
drweb:*:426:426:Dr.Web Mail Scanner:/nonexistent:/sbin/nologin
courier:*:465:465:Courier Mail Server:/nonexistent:/sbin/nologin
_bbstored:*:505:505::0:0:BoxBackup Store Daemon:/nonexistent:/bin/sh
qtss:*:554:554:Darwin Streaming Server:/nonexistent:/sbin/nologin
ircdru:*:555:555:Russian hybrid IRC server:/nonexistent:/bin/sh
messagebus:*:556:556:D-BUS Daemon User:/nonexistent:/sbin/nologin
bnetd:*:700:700:Bnetd user:/nonexistent:/sbin/nologin
bopm:*:717:717:Blitzed Open Proxy Monitor:/nonexistent:/bin/sh
bacula:*:910:910:Bacula Daemon:/var/db/bacula:/sbin/nologin
下面是目前預留的 GID。
bind:*:53:
rdfdb:*:55:
spamd:*:58:
cyrus:*:60:
proxy:*:62:
authpf:*:63:
uucp:*:66:
xten:*:67:
dialer:*:68:
network:*:69:
pgsql:*:70:
simscan:*:74:
www:*:80:
qnofiles:*:81:
qmail:*:82:
mysql:*:88:
vpopmail:*:89:
firebird:*:90:
mailman:*:91:
gdm:*:92:
jabber:*:93:
p4admin:*:94:
interch:*:95:
squeuer:*:96:
mud:*:97:
msql:*:98:
rscsi:*:99:
squid:*:100:
quagga:*:101:
ganglia:*:102:
sgeadmin:*:103:
slimserv:*:104:
dnetc:*:105:
clamav:*:106:
cacti:*:107:
webkit:*:108:
quickml:*:109:
vscan:*:110:
fido:*:111:
dcc:*:112:
amavis:*:113:
dhis:*:114:
_symon:*:115:
postfix:*:125:
maildrop:*:126:
rbldns:*:153:
sfs:*:171:
agk:*:172:
polipo:*:173:
moinmoin:*:192:
sympa:*:200:
dspam:*:202:
_tor:*:256:
ldap:*:389:
drweb:*:426:
courier:*:465:
_bbstored:*:505:
qtss:*:554:
ircdru:*:555:
messagebus:*:556:
realtime:*:557:
bnetd:*:700:
bopm:*:717:
bacula:*:910: